dvb_frontend.c 50.1 KB
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/*
 * 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/list.h>
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#include <linux/freezer.h>
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#include <linux/jiffies.h>
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#include <linux/kthread.h>
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#include <asm/processor.h>

#include "dvb_frontend.h"
#include "dvbdev.h"

static int dvb_frontend_debug;
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static int dvb_shutdown_timeout;
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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);
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MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
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module_param(dvb_shutdown_timeout, int, 0644);
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MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
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module_param(dvb_force_auto_inversion, int, 0644);
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MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
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module_param(dvb_override_tune_delay, int, 0644);
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MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
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module_param(dvb_powerdown_on_sleep, int, 0644);
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MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
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#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)
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#define FE_ALGO_HW		1
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/*
 * 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.
 */

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static DEFINE_MUTEX(frontend_mutex);
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struct dvb_frontend_private {

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	/* thread/frontend values */
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	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;
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	struct task_struct *thread;
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	unsigned long release_jiffies;
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	unsigned int exit;
	unsigned int wakeup;
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	fe_status_t status;
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	unsigned long tune_mode_flags;
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	unsigned int delay;
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	unsigned int reinitialise;
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	int tone;
	int voltage;
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	/* 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;
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};

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static void dvb_frontend_wakeup(struct dvb_frontend *fe);
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static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
{
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	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	struct dvb_fe_events *events = &fepriv->events;
	struct dvb_frontend_event *e;
	int wp;

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	dprintk ("%s\n", __func__);
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	if (mutex_lock_interruptible (&events->mtx))
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		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, &fepriv->parameters,
		sizeof (struct dvb_frontend_parameters));

	if (status & FE_HAS_LOCK)
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		if (fe->ops.get_frontend)
			fe->ops.get_frontend(fe, &e->parameters);
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	events->eventw = wp;

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	mutex_unlock(&events->mtx);
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	e->status = status;

	wake_up_interruptible (&events->wait_queue);
}

static int dvb_frontend_get_event(struct dvb_frontend *fe,
			    struct dvb_frontend_event *event, int flags)
{
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	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	struct dvb_fe_events *events = &fepriv->events;

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	dprintk ("%s\n", __func__);
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	if (events->overflow) {
		events->overflow = 0;
		return -EOVERFLOW;
	}

	if (events->eventw == events->eventr) {
		int ret;

		if (flags & O_NONBLOCK)
			return -EWOULDBLOCK;

		up(&fepriv->sem);

		ret = wait_event_interruptible (events->wait_queue,
						events->eventw != events->eventr);

		if (down_interruptible (&fepriv->sem))
			return -ERESTARTSYS;

		if (ret < 0)
			return ret;
	}

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	if (mutex_lock_interruptible (&events->mtx))
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		return -ERESTARTSYS;

	memcpy (event, &events->events[events->eventr],
		sizeof(struct dvb_frontend_event));

	events->eventr = (events->eventr + 1) % MAX_EVENT;

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	mutex_unlock(&events->mtx);
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	return 0;
}

static void dvb_frontend_init(struct dvb_frontend *fe)
{
	dprintk ("DVB: initialising frontend %i (%s)...\n",
		 fe->dvb->num,
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		 fe->ops.info.name);

	if (fe->ops.init)
		fe->ops.init(fe);
	if (fe->ops.tuner_ops.init) {
		fe->ops.tuner_ops.init(fe);
		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 0);
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	}
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}

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void dvb_frontend_reinitialise(struct dvb_frontend *fe)
{
	struct dvb_frontend_private *fepriv = fe->frontend_priv;

	fepriv->reinitialise = 1;
	dvb_frontend_wakeup(fe);
}
EXPORT_SYMBOL(dvb_frontend_reinitialise);

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static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
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{
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	int q2;
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	dprintk ("%s\n", __func__);
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	if (locked)
		(fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
	else
		(fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
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	q2 = fepriv->quality - 128;
	q2 *= q2;
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	fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
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}

/**
 * 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.
 */
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static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
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{
	int autoinversion;
	int ready = 0;
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	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	int original_inversion = fepriv->parameters.inversion;
	u32 original_frequency = fepriv->parameters.frequency;

	/* are we using autoinversion? */
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	autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
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			 (fepriv->parameters.inversion == INVERSION_AUTO));

	/* setup parameters correctly */
	while(!ready) {
		/* calculate the lnb_drift */
		fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;

		/* wrap the auto_step if we've exceeded the maximum drift */
		if (fepriv->lnb_drift > fepriv->max_drift) {
			fepriv->auto_step = 0;
			fepriv->auto_sub_step = 0;
			fepriv->lnb_drift = 0;
		}

		/* perform inversion and +/- zigzag */
		switch(fepriv->auto_sub_step) {
		case 0:
			/* try with the current inversion and current drift setting */
			ready = 1;
			break;

		case 1:
			if (!autoinversion) break;

			fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
			ready = 1;
			break;

		case 2:
			if (fepriv->lnb_drift == 0) break;

			fepriv->lnb_drift = -fepriv->lnb_drift;
			ready = 1;
			break;

		case 3:
			if (fepriv->lnb_drift == 0) break;
			if (!autoinversion) break;

			fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
			fepriv->lnb_drift = -fepriv->lnb_drift;
			ready = 1;
			break;

		default:
			fepriv->auto_step++;
			fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
			break;
		}

		if (!ready) fepriv->auto_sub_step++;
	}

	/* if this attempt would hit where we started, indicate a complete
	 * iteration has occurred */
	if ((fepriv->auto_step == fepriv->started_auto_step) &&
	    (fepriv->auto_sub_step == 0) && check_wrapped) {
		return 1;
	}

	dprintk("%s: drift:%i inversion:%i auto_step:%i "
		"auto_sub_step:%i started_auto_step:%i\n",
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		__func__, fepriv->lnb_drift, fepriv->inversion,
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		fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);

	/* set the frontend itself */
	fepriv->parameters.frequency += fepriv->lnb_drift;
	if (autoinversion)
		fepriv->parameters.inversion = fepriv->inversion;
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	if (fe->ops.set_frontend)
		fe->ops.set_frontend(fe, &fepriv->parameters);
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	fepriv->parameters.frequency = original_frequency;
	fepriv->parameters.inversion = original_inversion;

	fepriv->auto_sub_step++;
	return 0;
}

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static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
{
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	fe_status_t s = 0;
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	struct dvb_frontend_private *fepriv = fe->frontend_priv;

	/* if we've got no parameters, just keep idling */
	if (fepriv->state & FESTATE_IDLE) {
		fepriv->delay = 3*HZ;
		fepriv->quality = 0;
		return;
	}

	/* in SCAN mode, we just set the frontend when asked and leave it alone */
	if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
		if (fepriv->state & FESTATE_RETUNE) {
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			if (fe->ops.set_frontend)
				fe->ops.set_frontend(fe, &fepriv->parameters);
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			fepriv->state = FESTATE_TUNED;
		}
		fepriv->delay = 3*HZ;
		fepriv->quality = 0;
		return;
	}

	/* get the frontend status */
	if (fepriv->state & FESTATE_RETUNE) {
		s = 0;
	} else {
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		if (fe->ops.read_status)
			fe->ops.read_status(fe, &s);
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		if (s != fepriv->status) {
			dvb_frontend_add_event(fe, s);
			fepriv->status = s;
		}
	}

	/* if we're not tuned, and we have a lock, move to the TUNED state */
	if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
		fepriv->state = FESTATE_TUNED;

		/* if we're tuned, then we have determined the correct inversion */
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		if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
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		    (fepriv->parameters.inversion == INVERSION_AUTO)) {
			fepriv->parameters.inversion = fepriv->inversion;
		}
		return;
	}

	/* if we are tuned already, check we're still locked */
	if (fepriv->state & FESTATE_TUNED) {
		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);

		/* we're tuned, and the lock is still good... */
		if (s & FE_HAS_LOCK) {
			return;
		} else { /* if we _WERE_ tuned, but now don't have a lock */
			fepriv->state = FESTATE_ZIGZAG_FAST;
			fepriv->started_auto_step = fepriv->auto_step;
			fepriv->check_wrapped = 0;
		}
	}

	/* 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 ((fepriv->state & FESTATE_LOSTLOCK) &&
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	    (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
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		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
		return;
	}

	/* 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 (fepriv->state & FESTATE_DISEQC) {
		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
		return;
	}

	/* 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 (fepriv->state & FESTATE_RETUNE) {
		fepriv->lnb_drift = 0;
		fepriv->auto_step = 0;
		fepriv->auto_sub_step = 0;
		fepriv->started_auto_step = 0;
		fepriv->check_wrapped = 0;
	}

	/* fast zigzag. */
	if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
		fepriv->delay = fepriv->min_delay;

		/* peform a tune */
		if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) {
			/* OK, if we've run out of trials at the fast speed.
			 * Drop back to slow for the _next_ attempt */
			fepriv->state = FESTATE_SEARCHING_SLOW;
			fepriv->started_auto_step = fepriv->auto_step;
			return;
		}
		fepriv->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 (fepriv->state & FESTATE_RETUNE) {
			fepriv->state = FESTATE_TUNING_FAST;
		}
	}

	/* slow zigzag */
	if (fepriv->state & FESTATE_SEARCHING_SLOW) {
		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);

		/* Note: don't bother checking for wrapping; we stay in this
		 * state until we get a lock */
		dvb_frontend_swzigzag_autotune(fe, 0);
	}
}

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static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
{
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	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	if (fepriv->exit)
		return 1;

	if (fepriv->dvbdev->writers == 1)
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		if (time_after(jiffies, fepriv->release_jiffies +
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				  dvb_shutdown_timeout * HZ))
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			return 1;

	return 0;
}

static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
{
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	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	if (fepriv->wakeup) {
		fepriv->wakeup = 0;
		return 1;
	}
	return dvb_frontend_is_exiting(fe);
}

static void dvb_frontend_wakeup(struct dvb_frontend *fe)
{
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	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	fepriv->wakeup = 1;
	wake_up_interruptible(&fepriv->wait_queue);
}

static int dvb_frontend_thread(void *data)
{
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	struct dvb_frontend *fe = data;
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	unsigned long timeout;
	fe_status_t s;
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	struct dvb_frontend_parameters *params;
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	dprintk("%s\n", __func__);
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	fepriv->check_wrapped = 0;
	fepriv->quality = 0;
	fepriv->delay = 3*HZ;
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	fepriv->status = 0;
	fepriv->wakeup = 0;
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	fepriv->reinitialise = 0;

	dvb_frontend_init(fe);
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	set_freezable();
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	while (1) {
		up(&fepriv->sem);	    /* is locked when we enter the thread... */
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restart:
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		timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
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			dvb_frontend_should_wakeup(fe) || kthread_should_stop()
				|| freezing(current),
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			fepriv->delay);

		if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
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			/* got signal or quitting */
			break;
		}

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		if (try_to_freeze())
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			goto restart;
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		if (down_interruptible(&fepriv->sem))
			break;

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		if (fepriv->reinitialise) {
			dvb_frontend_init(fe);
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			if (fepriv->tone != -1) {
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				fe->ops.set_tone(fe, fepriv->tone);
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			}
			if (fepriv->voltage != -1) {
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				fe->ops.set_voltage(fe, fepriv->voltage);
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			}
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			fepriv->reinitialise = 0;
		}

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		/* do an iteration of the tuning loop */
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		if (fe->ops.get_frontend_algo) {
			if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
				/* have we been asked to retune? */
				params = NULL;
				if (fepriv->state & FESTATE_RETUNE) {
					params = &fepriv->parameters;
					fepriv->state = FESTATE_TUNED;
				}

				fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
				if (s != fepriv->status) {
					dvb_frontend_add_event(fe, s);
					fepriv->status = s;
				}
571 572
			} else
				dvb_frontend_swzigzag(fe);
573 574
		} else
			dvb_frontend_swzigzag(fe);
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	}

577 578 579
	if (dvb_powerdown_on_sleep) {
		if (fe->ops.set_voltage)
			fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
580 581 582 583
		if (fe->ops.tuner_ops.sleep) {
			fe->ops.tuner_ops.sleep(fe);
			if (fe->ops.i2c_gate_ctrl)
				fe->ops.i2c_gate_ctrl(fe, 0);
584
		}
585 586
		if (fe->ops.sleep)
			fe->ops.sleep(fe);
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	}

589
	fepriv->thread = NULL;
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	mb();

	dvb_frontend_wakeup(fe);
	return 0;
}

static void dvb_frontend_stop(struct dvb_frontend *fe)
{
598
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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600
	dprintk ("%s\n", __func__);
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601 602 603 604

	fepriv->exit = 1;
	mb();

605
	if (!fepriv->thread)
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		return;

608
	kthread_stop(fepriv->thread);
609

610
	init_MUTEX (&fepriv->sem);
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	fepriv->state = FESTATE_IDLE;

	/* paranoia check in case a signal arrived */
614 615 616
	if (fepriv->thread)
		printk("dvb_frontend_stop: warning: thread %p won't exit\n",
				fepriv->thread);
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}

619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661
s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
{
	return ((curtime.tv_usec < lasttime.tv_usec) ?
		1000000 - lasttime.tv_usec + curtime.tv_usec :
		curtime.tv_usec - lasttime.tv_usec);
}
EXPORT_SYMBOL(timeval_usec_diff);

static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
{
	curtime->tv_usec += add_usec;
	if (curtime->tv_usec >= 1000000) {
		curtime->tv_usec -= 1000000;
		curtime->tv_sec++;
	}
}

/*
 * Sleep until gettimeofday() > waketime + add_usec
 * This needs to be as precise as possible, but as the delay is
 * usually between 2ms and 32ms, it is done using a scheduled msleep
 * followed by usleep (normally a busy-wait loop) for the remainder
 */
void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
{
	struct timeval lasttime;
	s32 delta, newdelta;

	timeval_usec_add(waketime, add_usec);

	do_gettimeofday(&lasttime);
	delta = timeval_usec_diff(lasttime, *waketime);
	if (delta > 2500) {
		msleep((delta - 1500) / 1000);
		do_gettimeofday(&lasttime);
		newdelta = timeval_usec_diff(lasttime, *waketime);
		delta = (newdelta > delta) ? 0 : newdelta;
	}
	if (delta > 0)
		udelay(delta);
}
EXPORT_SYMBOL(dvb_frontend_sleep_until);

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static int dvb_frontend_start(struct dvb_frontend *fe)
{
	int ret;
665
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
666
	struct task_struct *fe_thread;
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668
	dprintk ("%s\n", __func__);
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670
	if (fepriv->thread) {
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		if (!fepriv->exit)
			return 0;
		else
			dvb_frontend_stop (fe);
	}

	if (signal_pending(current))
		return -EINTR;
	if (down_interruptible (&fepriv->sem))
		return -EINTR;

	fepriv->state = FESTATE_IDLE;
	fepriv->exit = 0;
684
	fepriv->thread = NULL;
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	mb();

687 688 689 690 691
	fe_thread = kthread_run(dvb_frontend_thread, fe,
		"kdvb-fe-%i", fe->dvb->num);
	if (IS_ERR(fe_thread)) {
		ret = PTR_ERR(fe_thread);
		printk("dvb_frontend_start: failed to start kthread (%d)\n", ret);
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		up(&fepriv->sem);
		return ret;
	}
695
	fepriv->thread = fe_thread;
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	return 0;
}

699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715
static void dvb_frontend_get_frequeny_limits(struct dvb_frontend *fe,
					u32 *freq_min, u32 *freq_max)
{
	*freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);

	if (fe->ops.info.frequency_max == 0)
		*freq_max = fe->ops.tuner_ops.info.frequency_max;
	else if (fe->ops.tuner_ops.info.frequency_max == 0)
		*freq_max = fe->ops.info.frequency_max;
	else
		*freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);

	if (*freq_min == 0 || *freq_max == 0)
		printk(KERN_WARNING "DVB: frontend %u frequency limits undefined - fix the driver\n",
		       fe->dvb->num);
}

716 717 718
static int dvb_frontend_check_parameters(struct dvb_frontend *fe,
				struct dvb_frontend_parameters *parms)
{
719 720 721
	u32 freq_min;
	u32 freq_max;

722
	/* range check: frequency */
723 724 725
	dvb_frontend_get_frequeny_limits(fe, &freq_min, &freq_max);
	if ((freq_min && parms->frequency < freq_min) ||
	    (freq_max && parms->frequency > freq_max)) {
726
		printk(KERN_WARNING "DVB: frontend %u frequency %u out of range (%u..%u)\n",
727
		       fe->dvb->num, parms->frequency, freq_min, freq_max);
728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
		return -EINVAL;
	}

	/* range check: symbol rate */
	if (fe->ops.info.type == FE_QPSK) {
		if ((fe->ops.info.symbol_rate_min &&
		     parms->u.qpsk.symbol_rate < fe->ops.info.symbol_rate_min) ||
		    (fe->ops.info.symbol_rate_max &&
		     parms->u.qpsk.symbol_rate > fe->ops.info.symbol_rate_max)) {
			printk(KERN_WARNING "DVB: frontend %u symbol rate %u out of range (%u..%u)\n",
			       fe->dvb->num, parms->u.qpsk.symbol_rate,
			       fe->ops.info.symbol_rate_min, fe->ops.info.symbol_rate_max);
			return -EINVAL;
		}

	} else if (fe->ops.info.type == FE_QAM) {
		if ((fe->ops.info.symbol_rate_min &&
		     parms->u.qam.symbol_rate < fe->ops.info.symbol_rate_min) ||
		    (fe->ops.info.symbol_rate_max &&
		     parms->u.qam.symbol_rate > fe->ops.info.symbol_rate_max)) {
			printk(KERN_WARNING "DVB: frontend %u symbol rate %u out of range (%u..%u)\n",
			       fe->dvb->num, parms->u.qam.symbol_rate,
			       fe->ops.info.symbol_rate_min, fe->ops.info.symbol_rate_max);
			return -EINVAL;
		}
	}

	return 0;
}

758
struct dtv_cmds_h dtv_cmds[] = {
759 760 761
	[DTV_TUNE] = {
		.name	= "DTV_TUNE",
		.cmd	= DTV_TUNE,
762 763
		.set	= 1,
	},
764 765 766
	[DTV_CLEAR] = {
		.name	= "DTV_CLEAR",
		.cmd	= DTV_CLEAR,
767 768 769 770
		.set	= 1,
	},

	/* Set */
771 772 773
	[DTV_FREQUENCY] = {
		.name	= "DTV_FREQUENCY",
		.cmd	= DTV_FREQUENCY,
774 775
		.set	= 1,
	},
776 777 778
	[DTV_BANDWIDTH_HZ] = {
		.name	= "DTV_BANDWIDTH_HZ",
		.cmd	= DTV_BANDWIDTH_HZ,
779 780
		.set	= 1,
	},
781 782 783
	[DTV_MODULATION] = {
		.name	= "DTV_MODULATION",
		.cmd	= DTV_MODULATION,
784 785
		.set	= 1,
	},
786 787 788
	[DTV_INVERSION] = {
		.name	= "DTV_INVERSION",
		.cmd	= DTV_INVERSION,
789 790
		.set	= 1,
	},
791 792 793
	[DTV_DISEQC_MASTER] = {
		.name	= "DTV_DISEQC_MASTER",
		.cmd	= DTV_DISEQC_MASTER,
794 795 796
		.set	= 1,
		.buffer	= 1,
	},
797 798 799
	[DTV_SYMBOL_RATE] = {
		.name	= "DTV_SYMBOL_RATE",
		.cmd	= DTV_SYMBOL_RATE,
800 801
		.set	= 1,
	},
802 803 804
	[DTV_INNER_FEC] = {
		.name	= "DTV_INNER_FEC",
		.cmd	= DTV_INNER_FEC,
805 806
		.set	= 1,
	},
807 808 809
	[DTV_VOLTAGE] = {
		.name	= "DTV_VOLTAGE",
		.cmd	= DTV_VOLTAGE,
810 811
		.set	= 1,
	},
812 813 814
	[DTV_TONE] = {
		.name	= "DTV_TONE",
		.cmd	= DTV_TONE,
815 816
		.set	= 1,
	},
817 818 819
	[DTV_PILOT] = {
		.name	= "DTV_PILOT",
		.cmd	= DTV_PILOT,
820 821
		.set	= 1,
	},
822 823 824
	[DTV_ROLLOFF] = {
		.name	= "DTV_ROLLOFF",
		.cmd	= DTV_ROLLOFF,
825 826
		.set	= 1,
	},
827 828 829
	[DTV_DELIVERY_SYSTEM] = {
		.name	= "DTV_DELIVERY_SYSTEM",
		.cmd	= DTV_DELIVERY_SYSTEM,
830 831
		.set	= 1,
	},
832 833 834
	[DTV_ISDB_SEGMENT_IDX] = {
		.name	= "DTV_ISDB_SEGMENT_IDX",
		.cmd	= DTV_ISDB_SEGMENT_IDX,
835 836
		.set	= 1,
	},
837 838 839
	[DTV_ISDB_SEGMENT_WIDTH] = {
		.name	= "DTV_ISDB_SEGMENT_WIDTH",
		.cmd	= DTV_ISDB_SEGMENT_WIDTH,
840 841 842 843
		.set	= 1,
	},

	/* Get */
844 845 846
	[DTV_DISEQC_SLAVE_REPLY] = {
		.name	= "DTV_DISEQC_SLAVE_REPLY",
		.cmd	= DTV_DISEQC_SLAVE_REPLY,
847 848 849
		.set	= 0,
		.buffer	= 1,
	},
850 851 852
	[DTV_ISDB_LAYERA_FEC] = {
		.name	= "DTV_ISDB_LAYERA_FEC",
		.cmd	= DTV_ISDB_LAYERA_FEC,
853 854
		.set	= 0,
	},
855 856 857
	[DTV_ISDB_LAYERA_MODULATION] = {
		.name	= "DTV_ISDB_LAYERA_MODULATION",
		.cmd	= DTV_ISDB_LAYERA_MODULATION,
858 859
		.set	= 0,
	},
860 861 862
	[DTV_ISDB_LAYERA_SEGMENT_WIDTH] = {
		.name	= "DTV_ISDB_LAYERA_SEGMENT_WIDTH",
		.cmd	= DTV_ISDB_LAYERA_SEGMENT_WIDTH,
863 864
		.set	= 0,
	},
865 866 867
	[DTV_ISDB_LAYERB_FEC] = {
		.name	= "DTV_ISDB_LAYERB_FEC",
		.cmd	= DTV_ISDB_LAYERB_FEC,
868 869
		.set	= 0,
	},
870 871 872
	[DTV_ISDB_LAYERB_MODULATION] = {
		.name	= "DTV_ISDB_LAYERB_MODULATION",
		.cmd	= DTV_ISDB_LAYERB_MODULATION,
873 874
		.set	= 0,
	},
875 876 877
	[DTV_ISDB_LAYERB_SEGMENT_WIDTH] = {
		.name	= "DTV_ISDB_LAYERB_SEGMENT_WIDTH",
		.cmd	= DTV_ISDB_LAYERB_SEGMENT_WIDTH,
878 879
		.set	= 0,
	},
880 881 882
	[DTV_ISDB_LAYERC_FEC] = {
		.name	= "DTV_ISDB_LAYERC_FEC",
		.cmd	= DTV_ISDB_LAYERC_FEC,
883 884
		.set	= 0,
	},
885 886 887
	[DTV_ISDB_LAYERC_MODULATION] = {
		.name	= "DTV_ISDB_LAYERC_MODULATION",
		.cmd	= DTV_ISDB_LAYERC_MODULATION,
888 889
		.set	= 0,
	},
890 891 892
	[DTV_ISDB_LAYERC_SEGMENT_WIDTH] = {
		.name	= "DTV_ISDB_LAYERC_SEGMENT_WIDTH",
		.cmd	= DTV_ISDB_LAYERC_SEGMENT_WIDTH,
893 894 895 896
		.set	= 0,
	},
};

897
void dtv_property_dump(struct dtv_property *tvp)
898 899 900 901 902 903
{
	int i;

	printk("%s() tvp.cmd    = 0x%08x (%s)\n"
		,__FUNCTION__
		,tvp->cmd
904
		,dtv_cmds[ tvp->cmd ].name);
905

906
	if(dtv_cmds[ tvp->cmd ].buffer) {
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930

		printk("%s() tvp.u.buffer.len = 0x%02x\n"
			,__FUNCTION__
			,tvp->u.buffer.len);

		for(i = 0; i < tvp->u.buffer.len; i++)
			printk("%s() tvp.u.buffer.data[0x%02x] = 0x%02x\n"
				,__FUNCTION__
				,i
				,tvp->u.buffer.data[i]);

	} else
		printk("%s() tvp.u.data = 0x%08x\n", __FUNCTION__, tvp->u.data);
}

int is_legacy_delivery_system(fe_delivery_system_t s)
{
	if((s == SYS_UNDEFINED) || (s == SYS_DVBC_ANNEX_AC) ||
		(s == SYS_DVBC_ANNEX_B) || (s == SYS_DVBT) || (s == SYS_DVBS))
		return 1;

	return 0;
}

931 932 933 934 935 936 937 938
/* Synchronise the legacy tuning parameters into the cache, so that demodulator
 * drivers can use a single set_frontend tuning function, regardless of whether
 * it's being used for the legacy or new API, reducing code and complexity.
 */
void dtv_property_cache_sync(struct dvb_frontend *fe, struct dvb_frontend_parameters *p)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

939 940
	printk("%s()\n", __FUNCTION__);

941 942 943 944 945 946 947
	c->frequency = p->frequency;
	c->inversion = p->inversion;

	switch (fe->ops.info.type) {
	case FE_QPSK:
		c->symbol_rate = p->u.qpsk.symbol_rate;
		c->fec_inner = p->u.qpsk.fec_inner;
948
		c->delivery_system = SYS_DVBS;
949 950 951 952 953
		break;
	case FE_QAM:
		c->symbol_rate = p->u.qam.symbol_rate;
		c->fec_inner = p->u.qam.fec_inner;
		c->modulation = p->u.qam.modulation;
954
		c->delivery_system = SYS_DVBC_ANNEX_AC;
955 956
		break;
	case FE_OFDM:
957 958 959 960 961 962 963 964 965
		if (p->u.ofdm.bandwidth == BANDWIDTH_6_MHZ)
			c->bandwidth_hz = 6000000;
		else if (p->u.ofdm.bandwidth == BANDWIDTH_7_MHZ)
			c->bandwidth_hz = 7000000;
		else if (p->u.ofdm.bandwidth == BANDWIDTH_8_MHZ)
			c->bandwidth_hz = 8000000;
		else
			/* Including BANDWIDTH_AUTO */
			c->bandwidth_hz = 0;
966 967 968 969 970 971
		c->code_rate_HP = p->u.ofdm.code_rate_HP;
		c->code_rate_LP = p->u.ofdm.code_rate_LP;
		c->modulation = p->u.ofdm.constellation;
		c->transmission_mode = p->u.ofdm.transmission_mode;
		c->guard_interval = p->u.ofdm.guard_interval;
		c->hierarchy = p->u.ofdm.hierarchy_information;
972
		c->delivery_system = SYS_DVBT;
973 974 975
		break;
	case FE_ATSC:
		c->modulation = p->u.vsb.modulation;
976 977 978 979
		if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
			c->delivery_system = SYS_ATSC;
		else
			c->delivery_system = SYS_DVBC_ANNEX_B;
980 981 982 983
		break;
	}
}

984 985 986 987
/* Ensure the cached values are set correctly in the frontend
 * legacy tuning structures, for the advanced tuning API.
 */
void dtv_property_legacy_params_sync(struct dvb_frontend *fe)
988
{
989 990 991
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
	struct dvb_frontend_parameters *p = &fepriv->parameters;
992

993
	printk("%s()\n", __FUNCTION__);
994

995 996
	p->frequency = c->frequency;
	p->inversion = c->inversion;
997

998 999 1000 1001 1002
	switch (fe->ops.info.type) {
	case FE_QPSK:
		printk("%s() Preparing QPSK req\n", __FUNCTION__);
		p->u.qpsk.symbol_rate = c->symbol_rate;
		p->u.qpsk.fec_inner = c->fec_inner;
1003
		c->delivery_system = SYS_DVBS;
1004 1005 1006 1007 1008 1009
		break;
	case FE_QAM:
		printk("%s() Preparing QAM req\n", __FUNCTION__);
		p->u.qam.symbol_rate = c->symbol_rate;
		p->u.qam.fec_inner = c->fec_inner;
		p->u.qam.modulation = c->modulation;
1010
		c->delivery_system = SYS_DVBC_ANNEX_AC;
1011 1012 1013
		break;
	case FE_OFDM:
		printk("%s() Preparing OFDM req\n", __FUNCTION__);
1014 1015 1016 1017 1018 1019 1020 1021
		if (c->bandwidth_hz == 6000000)
			p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
		else if (c->bandwidth_hz == 7000000)
			p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
		else if (c->bandwidth_hz == 8000000)
			p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
		else
			p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1022 1023 1024 1025 1026 1027
		p->u.ofdm.code_rate_HP = c->code_rate_HP;
		p->u.ofdm.code_rate_LP = c->code_rate_LP;
		p->u.ofdm.constellation = c->modulation;
		p->u.ofdm.transmission_mode = c->transmission_mode;
		p->u.ofdm.guard_interval = c->guard_interval;
		p->u.ofdm.hierarchy_information = c->hierarchy;
1028
		c->delivery_system = SYS_DVBT;
1029 1030 1031 1032
		break;
	case FE_ATSC:
		printk("%s() Preparing VSB req\n", __FUNCTION__);
		p->u.vsb.modulation = c->modulation;
1033 1034 1035 1036
		if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
			c->delivery_system = SYS_ATSC;
		else
			c->delivery_system = SYS_DVBC_ANNEX_B;
1037 1038 1039 1040 1041 1042 1043 1044 1045
		break;
	}
}

/* Ensure the cached values are set correctly in the frontend
 * legacy tuning structures, for the legacy tuning API.
 */
void dtv_property_adv_params_sync(struct dvb_frontend *fe)
{
1046
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1047
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
1048
	struct dvb_frontend_parameters *p = &fepriv->parameters;
1049 1050 1051

	printk("%s()\n", __FUNCTION__);

1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
	p->frequency = c->frequency;
	p->inversion = c->inversion;

	switch(c->modulation) {
	case _8PSK:
	case _16APSK:
	case NBC_QPSK:
		p->u.qpsk.symbol_rate = c->symbol_rate;
		p->u.qpsk.fec_inner = c->fec_inner;
		break;
	default:
		break;
	}

	if(c->delivery_system == SYS_ISDBT) {
		/* Fake out a generic DVB-T request so we pass validation in the ioctl */
		p->frequency = c->frequency;
		p->inversion = INVERSION_AUTO;
		p->u.ofdm.constellation = QAM_AUTO;
		p->u.ofdm.code_rate_HP = FEC_AUTO;
		p->u.ofdm.code_rate_LP = FEC_AUTO;
		p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
		p->u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO;
		p->u.ofdm.guard_interval = GUARD_INTERVAL_AUTO;
		p->u.ofdm.hierarchy_information = HIERARCHY_AUTO;
	}
}

void dtv_property_cache_submit(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	printk("%s()\n", __FUNCTION__);

	/* For legacy delivery systems we don't need the delivery_system to
	 * be specified, but we populate the older structures from the cache
	 * so we can call set_frontend on older drivers.
	 */
1090 1091
	if(is_legacy_delivery_system(c->delivery_system)) {

1092 1093
		printk("%s() legacy, modulation = %d\n", __FUNCTION__, c->modulation);
		dtv_property_legacy_params_sync(fe);
1094 1095

	} else {
1096 1097
		printk("%s() adv, modulation = %d\n", __FUNCTION__, c->modulation);

1098 1099 1100 1101 1102 1103
		/* For advanced delivery systems / modulation types ...
		 * we seed the lecacy dvb_frontend_parameters structure
		 * so that the sanity checking code later in the IOCTL processing
		 * can validate our basic frequency ranges, symbolrates, modulation
		 * etc.
		 */
1104
		dtv_property_adv_params_sync(fe);
1105 1106 1107
	}
}

1108 1109 1110 1111 1112
static int dvb_frontend_ioctl_legacy(struct inode *inode, struct file *file,
			unsigned int cmd, void *parg);
static int dvb_frontend_ioctl_properties(struct inode *inode, struct file *file,
			unsigned int cmd, void *parg);

1113 1114 1115 1116 1117 1118 1119 1120 1121
int dtv_property_process_get(struct dvb_frontend *fe, struct dtv_property *tvp,
	struct inode *inode, struct file *file)
{
	int r = 0;

	printk("%s()\n", __FUNCTION__);

	dtv_property_dump(tvp);

1122 1123 1124 1125 1126 1127 1128
	/* Allow the frontend to validate incoming properties */
	if (fe->ops.get_property)
		r = fe->ops.get_property(fe, tvp);

	if (r < 0)
		return r;

1129 1130 1131 1132 1133 1134 1135
	switch(tvp->cmd) {
	case DTV_FREQUENCY:
		tvp->u.data = fe->dtv_property_cache.frequency;
		break;
	case DTV_MODULATION:
		tvp->u.data = fe->dtv_property_cache.modulation;
		break;
1136 1137
	case DTV_BANDWIDTH_HZ:
		tvp->u.data = fe->dtv_property_cache.bandwidth_hz;
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
		break;
	case DTV_INVERSION:
		tvp->u.data = fe->dtv_property_cache.inversion;
		break;
	case DTV_SYMBOL_RATE:
		tvp->u.data = fe->dtv_property_cache.symbol_rate;
		break;
	case DTV_INNER_FEC:
		tvp->u.data = fe->dtv_property_cache.fec_inner;
		break;
	case DTV_PILOT:
		tvp->u.data = fe->dtv_property_cache.pilot;
		break;
	case DTV_ROLLOFF:
		tvp->u.data = fe->dtv_property_cache.rolloff;
		break;
	case DTV_DELIVERY_SYSTEM:
		tvp->u.data = fe->dtv_property_cache.delivery_system;
		break;

	/* ISDB-T Support here */
	case DTV_ISDB_SEGMENT_IDX:
		tvp->u.data = fe->dtv_property_cache.isdb_segment_idx;
		break;
	case DTV_ISDB_SEGMENT_WIDTH:
		tvp->u.data = fe->dtv_property_cache.isdb_segment_width;
		break;
	case DTV_ISDB_LAYERA_FEC:
		tvp->u.data = fe->dtv_property_cache.isdb_layera_fec;
		break;
	case DTV_ISDB_LAYERA_MODULATION:
		tvp->u.data = fe->dtv_property_cache.isdb_layera_modulation;
		break;
	case DTV_ISDB_LAYERA_SEGMENT_WIDTH:
		tvp->u.data = fe->dtv_property_cache.isdb_layera_segment_width;
		break;
	case DTV_ISDB_LAYERB_FEC:
		tvp->u.data = fe->dtv_property_cache.isdb_layerb_fec;
		break;
	case DTV_ISDB_LAYERB_MODULATION:
		tvp->u.data = fe->dtv_property_cache.isdb_layerb_modulation;
		break;
	case DTV_ISDB_LAYERB_SEGMENT_WIDTH:
		tvp->u.data = fe->dtv_property_cache.isdb_layerb_segment_width;
		break;
	case DTV_ISDB_LAYERC_FEC:
		tvp->u.data = fe->dtv_property_cache.isdb_layerc_fec;
		break;
	case DTV_ISDB_LAYERC_MODULATION:
		tvp->u.data = fe->dtv_property_cache.isdb_layerc_modulation;
		break;
	case DTV_ISDB_LAYERC_SEGMENT_WIDTH:
		tvp->u.data = fe->dtv_property_cache.isdb_layerc_segment_width;
		break;
	case DTV_VOLTAGE:
		tvp->u.data = fe->dtv_property_cache.voltage;
		break;
	case DTV_TONE:
		tvp->u.data = fe->dtv_property_cache.sectone;
		break;
	default:
		r = -1;
	}

	return r;
}

int dtv_property_process_set(struct dvb_frontend *fe, struct dtv_property *tvp,
1206
	struct inode *inode, struct file *file)
1207 1208
{
	int r = 0;
1209
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
1210
	printk("%s()\n", __FUNCTION__);
1211
	dtv_property_dump(tvp);
1212

1213 1214 1215 1216 1217 1218 1219
	/* Allow the frontend to validate incoming properties */
	if (fe->ops.set_property)
		r = fe->ops.set_property(fe, tvp);

	if (r < 0)
		return r;

1220
	switch(tvp->cmd) {
1221
	case DTV_CLEAR:
1222 1223 1224 1225
		/* Reset a cache of data specific to the frontend here. This does
		 * not effect hardware.
		 */
		printk("%s() Flushing property cache\n", __FUNCTION__);
1226
		memset(&fe->dtv_property_cache, 0, sizeof(struct dtv_frontend_properties));
1227
		fe->dtv_property_cache.state = tvp->cmd;
1228
		fe->dtv_property_cache.delivery_system = SYS_UNDEFINED;
1229
		break;
1230
	case DTV_TUNE:
1231
		/* interpret the cache of data, build either a traditional frontend
1232 1233
		 * tunerequest so we can pass validation in the FE_SET_FRONTEND
		 * ioctl.
1234
		 */
1235
		fe->dtv_property_cache.state = tvp->cmd;
1236
		printk("%s() Finalised property cache\n", __FUNCTION__);
1237 1238
		dtv_property_cache_submit(fe);

1239 1240
		r |= dvb_frontend_ioctl_legacy(inode, file, FE_SET_FRONTEND,
			&fepriv->parameters);
1241
		break;
1242
	case DTV_FREQUENCY:
1243
		fe->dtv_property_cache.frequency = tvp->u.data;
1244
		break;
1245
	case DTV_MODULATION:
1246
		fe->dtv_property_cache.modulation = tvp->u.data;
1247
		break;
1248 1249
	case DTV_BANDWIDTH_HZ:
		fe->dtv_property_cache.bandwidth_hz = tvp->u.data;
1250
		break;
1251
	case DTV_INVERSION:
1252
		fe->dtv_property_cache.inversion = tvp->u.data;
1253
		break;
1254
	case DTV_SYMBOL_RATE:
1255
		fe->dtv_property_cache.symbol_rate = tvp->u.data;
1256
		break;
1257
	case DTV_INNER_FEC:
1258
		fe->dtv_property_cache.fec_inner = tvp->u.data;
1259
		break;
1260
	case DTV_PILOT:
1261
		fe->dtv_property_cache.pilot = tvp->u.data;
1262
		break;
1263
	case DTV_ROLLOFF:
1264
		fe->dtv_property_cache.rolloff = tvp->u.data;
1265
		break;
1266
	case DTV_DELIVERY_SYSTEM:
1267
		fe->dtv_property_cache.delivery_system = tvp->u.data;
1268 1269 1270
		break;

	/* ISDB-T Support here */
1271
	case DTV_ISDB_SEGMENT_IDX:
1272
		fe->dtv_property_cache.isdb_segment_idx = tvp->u.data;
1273
		break;
1274
	case DTV_ISDB_SEGMENT_WIDTH:
1275
		fe->dtv_property_cache.isdb_segment_width = tvp->u.data;
1276
		break;
1277
	case DTV_VOLTAGE:
1278
		fe->dtv_property_cache.voltage = tvp->u.data;
1279
		r = dvb_frontend_ioctl_legacy(inode, file, FE_SET_VOLTAGE,
1280
			(void *)fe->dtv_property_cache.voltage);
1281
		break;
1282
	case DTV_TONE:
1283
		fe->dtv_property_cache.sectone = tvp->u.data;
1284
		r = dvb_frontend_ioctl_legacy(inode, file, FE_SET_TONE,
1285
			(void *)fe->dtv_property_cache.sectone);
1286
		break;
1287 1288
	default:
		r = -1;
1289 1290
	}

1291
	return r;
1292 1293
}

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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 *fe = dvbdev->priv;
1299
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	int err = -EOPNOTSUPP;

1302
	dprintk ("%s\n", __func__);
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1303

1304
	if (fepriv->exit)
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		return -ENODEV;

	if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
	    (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
	     cmd == FE_DISEQC_RECV_SLAVE_REPLY))
		return -EPERM;

	if (down_interruptible (&fepriv->sem))
		return -ERESTARTSYS;

1315 1316
	if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
		err = dvb_frontend_ioctl_properties(inode, file, cmd, parg);
1317 1318
	else {
		fe->dtv_property_cache.state = DTV_UNDEFINED;
1319
		err = dvb_frontend_ioctl_legacy(inode, file, cmd, parg);
1320
	}
1321 1322 1323 1324 1325 1326 1327 1328 1329 1330

	up(&fepriv->sem);
	return err;
}

static int dvb_frontend_ioctl_properties(struct inode *inode, struct file *file,
			unsigned int cmd, void *parg)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dvb_frontend *fe = dvbdev->priv;
1331
	int err = 0;
1332 1333 1334 1335

	struct dtv_properties *tvps = NULL;
	struct dtv_property *tvp = NULL;
	int i;
1336 1337 1338

	dprintk("%s\n", __func__);

1339 1340 1341
	if(cmd == FE_SET_PROPERTY) {
		printk("%s() FE_SET_PROPERTY\n", __FUNCTION__);

1342
		tvps = (struct dtv_properties __user *)parg;
1343

1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
		printk("%s() properties.num = %d\n", __FUNCTION__, tvps->num);
		printk("%s() properties.props = %p\n", __FUNCTION__, tvps->props);

		/* Put an arbitrary limit on the number of messages that can
		 * be sent at once */
		if (tvps->num > DTV_IOCTL_MAX_MSGS)
			return -EINVAL;

		tvp = (struct dtv_property *) kmalloc(tvps->num *
			sizeof(struct dtv_property), GFP_KERNEL);
		if (!tvp) {
			err = -ENOMEM;
			goto out;
1357 1358
		}

1359 1360 1361 1362 1363 1364
		if (copy_from_user(tvp, tvps->props, tvps->num * sizeof(struct dtv_property))) {
			err = -EFAULT;
			goto out;
		}

		for (i = 0; i < tvps->num; i++)
1365
			err |= dtv_property_process_set(fe, tvp + i, inode, file);
1366 1367

		if(fe->dtv_property_cache.state == DTV_TUNE) {
1368 1369
			printk("%s() Property cache is full, tuning\n", __FUNCTION__);
		}
1370

1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
	} else
	if(cmd == FE_GET_PROPERTY) {
		printk("%s() FE_GET_PROPERTY\n", __FUNCTION__);

		tvps = (struct dtv_properties __user *)parg;

		printk("%s() properties.num = %d\n", __FUNCTION__, tvps->num);
		printk("%s() properties.props = %p\n", __FUNCTION__, tvps->props);

		/* Put an arbitrary limit on the number of messages that can
		 * be sent at once */
		if (tvps->num > DTV_IOCTL_MAX_MSGS)
			return -EINVAL;

		tvp = (struct dtv_property *) kmalloc(tvps->num *
			sizeof(struct dtv_property), GFP_KERNEL);
		if (!tvp) {
			err = -ENOMEM;
			goto out;
		}

		if (copy_from_user(tvp, tvps->props, tvps->num * sizeof(struct dtv_property))) {
			err = -EFAULT;
			goto out;
		}

		for (i = 0; i < tvps->num; i++)
1398
			err |= dtv_property_process_get(fe, tvp + i, inode, file);
1399 1400 1401 1402 1403 1404 1405 1406 1407

		if (copy_to_user(tvps->props, tvp, tvps->num * sizeof(struct dtv_property))) {
			err = -EFAULT;
			goto out;
		}

	} else
		err = -EOPNOTSUPP;

1408 1409
out:
	kfree(tvp);
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
	return err;
}

static int dvb_frontend_ioctl_legacy(struct inode *inode, struct file *file,
			unsigned int cmd, void *parg)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dvb_frontend *fe = dvbdev->priv;
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
	int err = -EOPNOTSUPP;

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	switch (cmd) {
	case FE_GET_INFO: {
1423
		struct dvb_frontend_info* info = parg;
1424
		memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
1425
		dvb_frontend_get_frequeny_limits(fe, &info->frequency_min, &info->frequency_max);
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		/* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
		 * do it, it is done for it. */
		info->caps |= FE_CAN_INVERSION_AUTO;
		err = 0;
		break;
	}

1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
	case FE_READ_STATUS: {
		fe_status_t* status = parg;

		/* if retune was requested but hasn't occured yet, prevent
		 * that user get signal state from previous tuning */
		if(fepriv->state == FESTATE_RETUNE) {
			err=0;
			*status = 0;
			break;
		}

1445 1446
		if (fe->ops.read_status)
			err = fe->ops.read_status(fe, status);
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		break;
1448
	}
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	case FE_READ_BER:
1450 1451
		if (fe->ops.read_ber)
			err = fe->ops.read_ber(fe, (__u32*) parg);
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		break;

	case FE_READ_SIGNAL_STRENGTH:
1455 1456
		if (fe->ops.read_signal_strength)
			err = fe->ops.read_signal_strength(fe, (__u16*) parg);
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		break;

	case FE_READ_SNR:
1460 1461
		if (fe->ops.read_snr)
			err = fe->ops.read_snr(fe, (__u16*) parg);
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		break;

	case FE_READ_UNCORRECTED_BLOCKS:
1465 1466
		if (fe->ops.read_ucblocks)
			err = fe->ops.read_ucblocks(fe, (__u32*) parg);
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		break;


	case FE_DISEQC_RESET_OVERLOAD:
1471 1472
		if (fe->ops.diseqc_reset_overload) {
			err = fe->ops.diseqc_reset_overload(fe);
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			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
		}
		break;

	case FE_DISEQC_SEND_MASTER_CMD:
1479 1480
		if (fe->ops.diseqc_send_master_cmd) {
			err = fe->ops.diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
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			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
		}
		break;

	case FE_DISEQC_SEND_BURST:
1487 1488
		if (fe->ops.diseqc_send_burst) {
			err = fe->ops.diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
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			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
		}
		break;

	case FE_SET_TONE:
1495 1496
		if (fe->ops.set_tone) {
			err = fe->ops.set_tone(fe, (fe_sec_tone_mode_t) parg);
1497
			fepriv->tone = (fe_sec_tone_mode_t) parg;
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			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
		}
		break;

	case FE_SET_VOLTAGE:
1504 1505
		if (fe->ops.set_voltage) {
			err = fe->ops.set_voltage(fe, (fe_sec_voltage_t) parg);
1506
			fepriv->voltage = (fe_sec_voltage_t) parg;
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			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
		}
		break;

	case FE_DISHNETWORK_SEND_LEGACY_CMD:
1513 1514
		if (fe->ops.dishnetwork_send_legacy_command) {
			err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
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			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
1517
		} else if (fe->ops.set_voltage) {
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
			/*
			 * NOTE: This is a fallback condition.  Some frontends
			 * (stv0299 for instance) take longer than 8msec to
			 * respond to a set_voltage command.  Those switches
			 * need custom routines to switch properly.  For all
			 * other frontends, the following shoule work ok.
			 * Dish network legacy switches (as used by Dish500)
			 * are controlled by sending 9-bit command words
			 * spaced 8msec apart.
			 * the actual command word is switch/port dependant
			 * so it is up to the userspace application to send
			 * the right command.
			 * The command must always start with a '0' after
			 * initialization, so parg is 8 bits and does not
			 * include the initialization or start bit
			 */
1534
			unsigned long swcmd = ((unsigned long) parg) << 1;
1535 1536 1537 1538 1539
			struct timeval nexttime;
			struct timeval tv[10];
			int i;
			u8 last = 1;
			if (dvb_frontend_debug)
1540
				printk("%s switch command: 0x%04lx\n", __func__, swcmd);
1541 1542 1543 1544 1545 1546
			do_gettimeofday(&nexttime);
			if (dvb_frontend_debug)
				memcpy(&tv[0], &nexttime, sizeof(struct timeval));
			/* before sending a command, initialize by sending
			 * a 32ms 18V to the switch
			 */
1547
			fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
1548 1549 1550 1551 1552
			dvb_frontend_sleep_until(&nexttime, 32000);

			for (i = 0; i < 9; i++) {
				if (dvb_frontend_debug)
					do_gettimeofday(&tv[i + 1]);
1553
				if ((swcmd & 0x01) != last) {
1554
					/* set voltage to (last ? 13V : 18V) */
1555
					fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
1556 1557
					last = (last) ? 0 : 1;
				}
1558
				swcmd = swcmd >> 1;
1559 1560 1561 1562 1563
				if (i != 8)
					dvb_frontend_sleep_until(&nexttime, 8000);
			}
			if (dvb_frontend_debug) {
				printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
1564
					__func__, fe->dvb->num);
1565 1566 1567 1568 1569 1570
				for (i = 1; i < 10; i++)
					printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
			}
			err = 0;
			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
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		}
		break;

	case FE_DISEQC_RECV_SLAVE_REPLY:
1575 1576
		if (fe->ops.diseqc_recv_slave_reply)
			err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
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		break;

	case FE_ENABLE_HIGH_LNB_VOLTAGE:
1580 1581
		if (fe->ops.enable_high_lnb_voltage)
			err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
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		break;

	case FE_SET_FRONTEND: {
		struct dvb_frontend_tune_settings fetunesettings;

1587
		if(fe->dtv_property_cache.state == DTV_TUNE) {
1588 1589 1590 1591 1592 1593 1594 1595 1596
			if (dvb_frontend_check_parameters(fe, &fepriv->parameters) < 0) {
				err = -EINVAL;
				break;
			}
		} else {
			if (dvb_frontend_check_parameters(fe, parg) < 0) {
				err = -EINVAL;
				break;
			}
1597

1598
			dtv_property_cache_sync(fe, &fepriv->parameters);
1599 1600 1601
			memcpy (&fepriv->parameters, parg,
				sizeof (struct dvb_frontend_parameters));
		}
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1602 1603 1604 1605 1606 1607 1608 1609 1610 1611

		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) {
			fepriv->parameters.inversion = INVERSION_AUTO;
			fetunesettings.parameters.inversion = INVERSION_AUTO;
		}
1612
		if (fe->ops.info.type == FE_OFDM) {
1613
			/* without hierarchical coding code_rate_LP is irrelevant,
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			 * so we tolerate the otherwise invalid FEC_NONE setting */
			if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
			    fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
				fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
		}

		/* get frontend-specific tuning settings */
1621
		if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
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			fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
			fepriv->max_drift = fetunesettings.max_drift;
			fepriv->step_size = fetunesettings.step_size;
		} else {
			/* default values */
1627
			switch(fe->ops.info.type) {
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			case FE_QPSK:
				fepriv->min_delay = HZ/20;
				fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
				fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
				break;

			case FE_QAM:
				fepriv->min_delay = HZ/20;
				fepriv->step_size = 0; /* no zigzag */
				fepriv->max_drift = 0;
				break;

			case FE_OFDM:
				fepriv->min_delay = HZ/20;
1642 1643
				fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
				fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
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				break;
			case FE_ATSC:
1646 1647 1648
				fepriv->min_delay = HZ/20;
				fepriv->step_size = 0;
				fepriv->max_drift = 0;
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				break;
			}
		}
		if (dvb_override_tune_delay > 0)
			fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;

		fepriv->state = FESTATE_RETUNE;
		dvb_frontend_wakeup(fe);
		dvb_frontend_add_event(fe, 0);
		fepriv->status = 0;
		err = 0;
		break;
	}

	case FE_GET_EVENT:
		err = dvb_frontend_get_event (fe, parg, file->f_flags);
		break;

	case FE_GET_FRONTEND:
1668
		if (fe->ops.get_frontend) {
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			memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
1670
			err = fe->ops.get_frontend(fe, (struct dvb_frontend_parameters*) parg);
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		}
		break;
1673 1674

	case FE_SET_FRONTEND_TUNE_MODE:
1675
		fepriv->tune_mode_flags = (unsigned long) parg;
1676
		err = 0;
1677
		break;
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	};

	return err;
}

1683

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static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dvb_frontend *fe = dvbdev->priv;
1688
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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1690
	dprintk ("%s\n", __func__);
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	poll_wait (file, &fepriv->events.wait_queue, wait);

	if (fepriv->events.eventw != fepriv->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 *fe = dvbdev->priv;
1704
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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	int ret;

1707
	dprintk ("%s\n", __func__);
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1709 1710
	if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
		if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
1711 1712 1713
			return ret;
	}

1714 1715
	if ((ret = dvb_generic_open (inode, file)) < 0)
		goto err1;
1716

1717
	if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
1718 1719 1720 1721 1722
		/* normal tune mode when opened R/W */
		fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
		fepriv->tone = -1;
		fepriv->voltage = -1;

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		ret = dvb_frontend_start (fe);
		if (ret)
1725
			goto err2;
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		/*  empty event queue */
		fepriv->events.eventr = fepriv->events.eventw = 0;
	}

	return ret;
1732 1733 1734 1735 1736 1737 1738

err2:
	dvb_generic_release(inode, file);
err1:
	if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
		fe->ops.ts_bus_ctrl(fe, 0);
	return ret;
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}

static int dvb_frontend_release(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dvb_frontend *fe = dvbdev->priv;
1745
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
1746
	int ret;
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1748
	dprintk ("%s\n", __func__);
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	if ((file->f_flags & O_ACCMODE) != O_RDONLY)
		fepriv->release_jiffies = jiffies;

1753 1754
	ret = dvb_generic_release (inode, file);

1755 1756 1757 1758 1759 1760 1761 1762
	if (dvbdev->users == -1) {
		if (fepriv->exit == 1) {
			fops_put(file->f_op);
			file->f_op = NULL;
			wake_up(&dvbdev->wait_queue);
		}
		if (fe->ops.ts_bus_ctrl)
			fe->ops.ts_bus_ctrl(fe, 0);
1763
	}
1764

1765
	return ret;
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}

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(struct dvb_adapter* dvb,
			  struct dvb_frontend* fe)
{
	struct dvb_frontend_private *fepriv;
	static const struct dvb_device dvbdev_template = {
		.users = ~0,
		.writers = 1,
		.readers = (~0)-1,
		.fops = &dvb_frontend_fops,
		.kernel_ioctl = dvb_frontend_ioctl
	};

1788
	dprintk ("%s\n", __func__);
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1790
	if (mutex_lock_interruptible(&frontend_mutex))
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		return -ERESTARTSYS;

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	fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
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	if (fe->frontend_priv == NULL) {
1795
		mutex_unlock(&frontend_mutex);
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		return -ENOMEM;
	}
1798
	fepriv = fe->frontend_priv;
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	init_MUTEX (&fepriv->sem);
	init_waitqueue_head (&fepriv->wait_queue);
	init_waitqueue_head (&fepriv->events.wait_queue);
1803
	mutex_init(&fepriv->events.mtx);
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	fe->dvb = dvb;
	fepriv->inversion = INVERSION_OFF;

	printk ("DVB: registering frontend %i (%s)...\n",
		fe->dvb->num,
1809
		fe->ops.info.name);
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	dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
			     fe, DVB_DEVICE_FRONTEND);

1814
	mutex_unlock(&frontend_mutex);
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	return 0;
}
EXPORT_SYMBOL(dvb_register_frontend);

int dvb_unregister_frontend(struct dvb_frontend* fe)
{
1821
	struct dvb_frontend_private *fepriv = fe->frontend_priv;
1822
	dprintk ("%s\n", __func__);
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1824
	mutex_lock(&frontend_mutex);
1825
	dvb_frontend_stop (fe);
1826 1827 1828 1829 1830 1831
	mutex_unlock(&frontend_mutex);

	if (fepriv->dvbdev->users < -1)
		wait_event(fepriv->dvbdev->wait_queue,
				fepriv->dvbdev->users==-1);

1832
	mutex_lock(&frontend_mutex);
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	dvb_unregister_device (fepriv->dvbdev);
1834

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	/* fe is invalid now */
	kfree(fepriv);
1837
	mutex_unlock(&frontend_mutex);
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	return 0;
}
EXPORT_SYMBOL(dvb_unregister_frontend);
1841

1842
#ifdef CONFIG_MEDIA_ATTACH
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
void dvb_frontend_detach(struct dvb_frontend* fe)
{
	void *ptr;

	if (fe->ops.release_sec) {
		fe->ops.release_sec(fe);
		symbol_put_addr(fe->ops.release_sec);
	}
	if (fe->ops.tuner_ops.release) {
		fe->ops.tuner_ops.release(fe);
		symbol_put_addr(fe->ops.tuner_ops.release);
	}
1855 1856 1857 1858
	if (fe->ops.analog_ops.release) {
		fe->ops.analog_ops.release(fe);
		symbol_put_addr(fe->ops.analog_ops.release);
	}
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
	ptr = (void*)fe->ops.release;
	if (ptr) {
		fe->ops.release(fe);
		symbol_put_addr(ptr);
	}
}
#else
void dvb_frontend_detach(struct dvb_frontend* fe)
{
	if (fe->ops.release_sec)
		fe->ops.release_sec(fe);
	if (fe->ops.tuner_ops.release)
		fe->ops.tuner_ops.release(fe);
1872 1873
	if (fe->ops.analog_ops.release)
		fe->ops.analog_ops.release(fe);
1874 1875 1876 1877 1878
	if (fe->ops.release)
		fe->ops.release(fe);
}
#endif
EXPORT_SYMBOL(dvb_frontend_detach);