ClabureDB: Classified Bug-Reports Database

   /*
    * 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>
  #include <linux/freezer.h>
  #include <linux/jiffies.h>
  #include <linux/kthread.h>
  #include <asm/processor.h>
  
  #include "dvb_frontend.h"
  #include "dvbdev.h"
  #include <linux/dvb/version.h>
  
  static int dvb_frontend_debug;
  static int dvb_shutdown_timeout;
  static int dvb_force_auto_inversion;
  static int dvb_override_tune_delay;
  static int dvb_powerdown_on_sleep = 1;
  static int dvb_mfe_wait_time = 5;
  
  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)");
  module_param(dvb_mfe_wait_time, int, 0644);
  MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  
  #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;
         struct task_struct *thread;
         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 wp;
 
         dprintk ("%s\n", __func__);
 
         if (mutex_lock_interruptible (&events->mtx))
                 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)
                 if (fe->ops.get_frontend)
                         fe->ops.get_frontend(fe, &e->parameters);
 
         events->eventw = wp;
 
         mutex_unlock(&events->mtx);
 
         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)
 {
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
         struct dvb_fe_events *events = &fepriv->events;
 
         dprintk ("%s\n", __func__);
 
         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;
         }
 
         if (mutex_lock_interruptible (&events->mtx))
                 return -ERESTARTSYS;
 
         memcpy (event, &events->events[events->eventr],
                 sizeof(struct dvb_frontend_event));
 
         events->eventr = (events->eventr + 1) % MAX_EVENT;
 
         mutex_unlock(&events->mtx);
 
         return 0;
 }
 
 static void dvb_frontend_init(struct dvb_frontend *fe)
 {
         dprintk ("DVB: initialising adapter %i frontend %i (%s)...\n",
                  fe->dvb->num,
                  fe->id,
                  fe->ops.info.name);
 
         if (fe->ops.init)
                 fe->ops.init(fe);
         if (fe->ops.tuner_ops.init) {
                 if (fe->ops.i2c_gate_ctrl)
                         fe->ops.i2c_gate_ctrl(fe, 1);
                 fe->ops.tuner_ops.init(fe);
                 if (fe->ops.i2c_gate_ctrl)
                         fe->ops.i2c_gate_ctrl(fe, 0);
         }
 }
 
 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);
 
 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 {
         int q2;
 
         dprintk ("%s\n", __func__);
 
         if (locked)
                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
         else
                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 
         q2 = fepriv->quality - 128;
         q2 *= q2;
 
         fepriv->delay = fepriv->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_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 {
         int autoinversion;
         int ready = 0;
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
         int original_inversion = fepriv->parameters.inversion;
         u32 original_frequency = fepriv->parameters.frequency;
 
         /* are we using autoinversion? */
         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
                          (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",
                 __func__, fepriv->lnb_drift, fepriv->inversion,
                 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;
         if (fe->ops.set_frontend)
                 fe->ops.set_frontend(fe, &fepriv->parameters);
 
         fepriv->parameters.frequency = original_frequency;
         fepriv->parameters.inversion = original_inversion;
 
         fepriv->auto_sub_step++;
         return 0;
 }
 
 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 {
         fe_status_t s = 0;
         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) {
                         if (fe->ops.set_frontend)
                                 fe->ops.set_frontend(fe, &fepriv->parameters);
                         fepriv->state = FESTATE_TUNED;
                 }
                 fepriv->delay = 3*HZ;
                 fepriv->quality = 0;
                 return;
         }
 
         /* get the frontend status */
         if (fepriv->state & FESTATE_RETUNE) {
                 s = 0;
         } else {
                 if (fe->ops.read_status)
                         fe->ops.read_status(fe, &s);
                 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 */
                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
                     (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) &&
             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
                 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);
         }
 }
 
 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 {
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 
         if (fepriv->exit)
                 return 1;
 
         if (fepriv->dvbdev->writers == 1)
                 if (time_after(jiffies, fepriv->release_jiffies +
                                   dvb_shutdown_timeout * HZ))
                         return 1;
 
         return 0;
 }
 
 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 {
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 
         if (fepriv->wakeup) {
                 fepriv->wakeup = 0;
                 return 1;
         }
         return dvb_frontend_is_exiting(fe);
 }
 
 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 {
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 
         fepriv->wakeup = 1;
         wake_up_interruptible(&fepriv->wait_queue);
 }
 
 static int dvb_frontend_thread(void *data)
 {
         struct dvb_frontend *fe = data;
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
         unsigned long timeout;
         fe_status_t s;
         struct dvb_frontend_parameters *params;
 
         dprintk("%s\n", __func__);
 
         fepriv->check_wrapped = 0;
         fepriv->quality = 0;
         fepriv->delay = 3*HZ;
         fepriv->status = 0;
         fepriv->wakeup = 0;
         fepriv->reinitialise = 0;
 
         dvb_frontend_init(fe);
 
         set_freezable();
         while (1) {
                 up(&fepriv->sem);            /* is locked when we enter the thread... */
 restart:
                 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
                         dvb_frontend_should_wakeup(fe) || kthread_should_stop()
                                 || freezing(current),
                         fepriv->delay);
 
                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
                         /* got signal or quitting */
                         break;
                 }
 
                 if (try_to_freeze())
                         goto restart;
 
                 if (down_interruptible(&fepriv->sem))
                         break;
 
                 if (fepriv->reinitialise) {
                         dvb_frontend_init(fe);
                         if (fepriv->tone != -1) {
                                 fe->ops.set_tone(fe, fepriv->tone);
                         }
                         if (fepriv->voltage != -1) {
                                 fe->ops.set_voltage(fe, fepriv->voltage);
                         }
                         fepriv->reinitialise = 0;
                 }
 
                 /* do an iteration of the tuning loop */
                 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;
                                 }
                         } else
                                 dvb_frontend_swzigzag(fe);
                 } else
                         dvb_frontend_swzigzag(fe);
         }
 
         if (dvb_powerdown_on_sleep) {
                 if (fe->ops.set_voltage)
                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
                 if (fe->ops.tuner_ops.sleep) {
                         if (fe->ops.i2c_gate_ctrl)
                                 fe->ops.i2c_gate_ctrl(fe, 1);
                         fe->ops.tuner_ops.sleep(fe);
                         if (fe->ops.i2c_gate_ctrl)
                                 fe->ops.i2c_gate_ctrl(fe, 0);
                 }
                 if (fe->ops.sleep)
                         fe->ops.sleep(fe);
         }
 
         fepriv->thread = NULL;
         mb();
 
         dvb_frontend_wakeup(fe);
         return 0;
 }
 
 static void dvb_frontend_stop(struct dvb_frontend *fe)
 {
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 
         dprintk ("%s\n", __func__);
 
         fepriv->exit = 1;
         mb();
 
         if (!fepriv->thread)
                 return;
 
         kthread_stop(fepriv->thread);
 
         init_MUTEX (&fepriv->sem);
         fepriv->state = FESTATE_IDLE;
 
         /* paranoia check in case a signal arrived */
         if (fepriv->thread)
                 printk("dvb_frontend_stop: warning: thread %p won't exit\n",
                                 fepriv->thread);
 }
 
 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);
 
 static int dvb_frontend_start(struct dvb_frontend *fe)
 {
         int ret;
         struct dvb_frontend_private *fepriv = fe->frontend_priv;
         struct task_struct *fe_thread;
 
         dprintk ("%s\n", __func__);
 
         if (fepriv->thread) {
                 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;
         fepriv->thread = NULL;
         mb();
 
         fe_thread = kthread_run(dvb_frontend_thread, fe,
                 "kdvb-ad-%i-fe-%i", fe->dvb->num,fe->id);
         if (IS_ERR(fe_thread)) {
                 ret = PTR_ERR(fe_thread);
                 printk("dvb_frontend_start: failed to start kthread (%d)\n", ret);
                 up(&fepriv->sem);
                 return ret;
         }
         fepriv->thread = fe_thread;
         return 0;
 }
 
 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: adapter %i frontend %u frequency limits undefined - fix the driver\n",
                        fe->dvb->num,fe->id);
 }
 
 static int dvb_frontend_check_parameters(struct dvb_frontend *fe,
                                 struct dvb_frontend_parameters *parms)
 {
         u32 freq_min;
         u32 freq_max;
 
         /* range check: frequency */
         dvb_frontend_get_frequeny_limits(fe, &freq_min, &freq_max);
         if ((freq_min && parms->frequency < freq_min) ||
             (freq_max && parms->frequency > freq_max)) {
                 printk(KERN_WARNING "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
                        fe->dvb->num, fe->id, parms->frequency, freq_min, freq_max);
                 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: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
                                fe->dvb->num, fe->id, 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: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
                                fe->dvb->num, fe->id, parms->u.qam.symbol_rate,
                                fe->ops.info.symbol_rate_min, fe->ops.info.symbol_rate_max);
                         return -EINVAL;
                 }
         }
 
         return 0;
 }
 
 struct dtv_cmds_h dtv_cmds[] = {
         [DTV_TUNE] = {
                 .name        = "DTV_TUNE",
                 .cmd        = DTV_TUNE,
                 .set        = 1,
         },
         [DTV_CLEAR] = {
                 .name        = "DTV_CLEAR",
                 .cmd        = DTV_CLEAR,
                 .set        = 1,
         },
 
         /* Set */
         [DTV_FREQUENCY] = {
                 .name        = "DTV_FREQUENCY",
                 .cmd        = DTV_FREQUENCY,
                 .set        = 1,
         },
         [DTV_BANDWIDTH_HZ] = {
                 .name        = "DTV_BANDWIDTH_HZ",
                 .cmd        = DTV_BANDWIDTH_HZ,
                 .set        = 1,
         },
         [DTV_MODULATION] = {
                 .name        = "DTV_MODULATION",
                 .cmd        = DTV_MODULATION,
                 .set        = 1,
         },
         [DTV_INVERSION] = {
                 .name        = "DTV_INVERSION",
                 .cmd        = DTV_INVERSION,
                 .set        = 1,
         },
         [DTV_DISEQC_MASTER] = {
                 .name        = "DTV_DISEQC_MASTER",
                 .cmd        = DTV_DISEQC_MASTER,
                 .set        = 1,
                 .buffer        = 1,
         },
         [DTV_SYMBOL_RATE] = {
                 .name        = "DTV_SYMBOL_RATE",
                 .cmd        = DTV_SYMBOL_RATE,
                 .set        = 1,
         },
         [DTV_INNER_FEC] = {
                 .name        = "DTV_INNER_FEC",
                 .cmd        = DTV_INNER_FEC,
                 .set        = 1,
         },
         [DTV_VOLTAGE] = {
                 .name        = "DTV_VOLTAGE",
                 .cmd        = DTV_VOLTAGE,
                 .set        = 1,
         },
         [DTV_TONE] = {
                 .name        = "DTV_TONE",
                 .cmd        = DTV_TONE,
                 .set        = 1,
         },
         [DTV_PILOT] = {
                 .name        = "DTV_PILOT",
                 .cmd        = DTV_PILOT,
                 .set        = 1,
         },
         [DTV_ROLLOFF] = {
                 .name        = "DTV_ROLLOFF",
                 .cmd        = DTV_ROLLOFF,
                 .set        = 1,
         },
         [DTV_DELIVERY_SYSTEM] = {
                 .name        = "DTV_DELIVERY_SYSTEM",
                 .cmd        = DTV_DELIVERY_SYSTEM,
                 .set        = 1,
         },
         [DTV_HIERARCHY] = {
                 .name        = "DTV_HIERARCHY",
                 .cmd        = DTV_HIERARCHY,
                 .set        = 1,
         },
         [DTV_CODE_RATE_HP] = {
                 .name        = "DTV_CODE_RATE_HP",
                 .cmd        = DTV_CODE_RATE_HP,
                 .set        = 1,
         },
         [DTV_CODE_RATE_LP] = {
                 .name        = "DTV_CODE_RATE_LP",
                 .cmd        = DTV_CODE_RATE_LP,
                 .set        = 1,
         },
         [DTV_GUARD_INTERVAL] = {
                 .name        = "DTV_GUARD_INTERVAL",
                 .cmd        = DTV_GUARD_INTERVAL,
                 .set        = 1,
         },
         [DTV_TRANSMISSION_MODE] = {
                 .name        = "DTV_TRANSMISSION_MODE",
                 .cmd        = DTV_TRANSMISSION_MODE,
                 .set        = 1,
         },
         /* Get */
         [DTV_DISEQC_SLAVE_REPLY] = {
                 .name        = "DTV_DISEQC_SLAVE_REPLY",
                 .cmd        = DTV_DISEQC_SLAVE_REPLY,
                 .set        = 0,
                 .buffer        = 1,
         },
         [DTV_API_VERSION] = {
                 .name        = "DTV_API_VERSION",
                 .cmd        = DTV_API_VERSION,
                 .set        = 0,
         },
         [DTV_CODE_RATE_HP] = {
                 .name        = "DTV_CODE_RATE_HP",
                 .cmd        = DTV_CODE_RATE_HP,
                 .set        = 0,
         },
         [DTV_CODE_RATE_LP] = {
                 .name        = "DTV_CODE_RATE_LP",
                 .cmd        = DTV_CODE_RATE_LP,
                 .set        = 0,
         },
         [DTV_GUARD_INTERVAL] = {
                 .name        = "DTV_GUARD_INTERVAL",
                 .cmd        = DTV_GUARD_INTERVAL,
                 .set        = 0,
         },
         [DTV_TRANSMISSION_MODE] = {
                 .name        = "DTV_TRANSMISSION_MODE",
                 .cmd        = DTV_TRANSMISSION_MODE,
                 .set        = 0,
         },
         [DTV_HIERARCHY] = {
                 .name        = "DTV_HIERARCHY",
                 .cmd        = DTV_HIERARCHY,
                 .set        = 0,
         },
 };
 
 void dtv_property_dump(struct dtv_property *tvp)
 {
         int i;
 
         if (tvp->cmd <= 0 || tvp->cmd > DTV_MAX_COMMAND) {
                 printk(KERN_WARNING "%s: tvp.cmd = 0x%08x undefined\n",
                         __func__, tvp->cmd);
                 return;
         }
 
         dprintk("%s() tvp.cmd    = 0x%08x (%s)\n"
                 ,__func__
                 ,tvp->cmd
                 ,dtv_cmds[ tvp->cmd ].name);
 
         if(dtv_cmds[ tvp->cmd ].buffer) {
 
                 dprintk("%s() tvp.u.buffer.len = 0x%02x\n"
                         ,__func__
                         ,tvp->u.buffer.len);
 
                 for(i = 0; i < tvp->u.buffer.len; i++)
                         dprintk("%s() tvp.u.buffer.data[0x%02x] = 0x%02x\n"
                                 ,__func__
                                 ,i
                                 ,tvp->u.buffer.data[i]);
 
         } else
                 dprintk("%s() tvp.u.data = 0x%08x\n", __func__, 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) ||
            (s == SYS_ATSC))
                 return 1;
 
         return 0;
 }
 
 /* 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;
 
         c->frequency = p->frequency;
         c->inversion = p->inversion;
 
         switch (fe->ops.info.type) {
         case FE_QPSK:
                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
                 c->symbol_rate = p->u.qpsk.symbol_rate;
                 c->fec_inner = p->u.qpsk.fec_inner;
                 c->delivery_system = SYS_DVBS;
                 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;
                 c->delivery_system = SYS_DVBC_ANNEX_AC;
                 break;
         case FE_OFDM:
                 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;
                 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;
                 c->delivery_system = SYS_DVBT;
                 break;
         case FE_ATSC:
                 c->modulation = p->u.vsb.modulation;
                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
                         c->delivery_system = SYS_ATSC;
                 else
                         c->delivery_system = SYS_DVBC_ANNEX_B;
                 break;
         }
 }
 
 /* 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)
{
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct dvb_frontend_private *fepriv = fe->frontend_priv;
        struct dvb_frontend_parameters *p = &fepriv->parameters;

        p->frequency = c->frequency;
        p->inversion = c->inversion;

        switch (fe->ops.info.type) {
        case FE_QPSK:
                dprintk("%s() Preparing QPSK req\n", __func__);
                p->u.qpsk.symbol_rate = c->symbol_rate;
                p->u.qpsk.fec_inner = c->fec_inner;
                c->delivery_system = SYS_DVBS;
                break;
        case FE_QAM:
                dprintk("%s() Preparing QAM req\n", __func__);
                p->u.qam.symbol_rate = c->symbol_rate;
                p->u.qam.fec_inner = c->fec_inner;
                p->u.qam.modulation = c->modulation;
                c->delivery_system = SYS_DVBC_ANNEX_AC;
                break;
        case FE_OFDM:
                dprintk("%s() Preparing OFDM req\n", __func__);
                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;
                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;
                c->delivery_system = SYS_DVBT;
                break;
        case FE_ATSC:
                dprintk("%s() Preparing VSB req\n", __func__);
                p->u.vsb.modulation = c->modulation;
                if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
                        c->delivery_system = SYS_ATSC;
                else
                        c->delivery_system = SYS_DVBC_ANNEX_B;
                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)
{
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct dvb_frontend_private *fepriv = fe->frontend_priv;
        struct dvb_frontend_parameters *p = &fepriv->parameters;

        p->frequency = c->frequency;
        p->inversion = c->inversion;

        switch(c->modulation) {
        case PSK_8:
        case APSK_16:
        case APSK_32:
        case 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;

        /* 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.
         */
        if(is_legacy_delivery_system(c->delivery_system)) {

                dprintk("%s() legacy, modulation = %d\n", __func__, c->modulation);
                dtv_property_legacy_params_sync(fe);

        } else {
                dprintk("%s() adv, modulation = %d\n", __func__, c->modulation);

                /* 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.
                 */
                dtv_property_adv_params_sync(fe);
        }
}

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);

int dtv_property_process_get(struct dvb_frontend *fe, struct dtv_property *tvp,
        struct inode *inode, struct file *file)
{
        int r = 0;

        dtv_property_dump(tvp);

        /* Allow the frontend to validate incoming properties */
        if (fe->ops.get_property)
                r = fe->ops.get_property(fe, tvp);

        if (r < 0)
                return r;

        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;
        case DTV_BANDWIDTH_HZ:
                tvp->u.data = fe->dtv_property_cache.bandwidth_hz;
                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;
        case DTV_VOLTAGE:
                tvp->u.data = fe->dtv_property_cache.voltage;
                break;
        case DTV_TONE:
                tvp->u.data = fe->dtv_property_cache.sectone;
                break;
        case DTV_API_VERSION:
                tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
                break;
        case DTV_CODE_RATE_HP:
                tvp->u.data = fe->dtv_property_cache.code_rate_HP;
                break;
        case DTV_CODE_RATE_LP:
                tvp->u.data = fe->dtv_property_cache.code_rate_LP;
                break;
        case DTV_GUARD_INTERVAL:
                tvp->u.data = fe->dtv_property_cache.guard_interval;
                break;
        case DTV_TRANSMISSION_MODE:
                tvp->u.data = fe->dtv_property_cache.transmission_mode;
                break;
        case DTV_HIERARCHY:
                tvp->u.data = fe->dtv_property_cache.hierarchy;
                break;
        default:
                r = -1;
        }

        return r;
}

int dtv_property_process_set(struct dvb_frontend *fe, struct dtv_property *tvp,
        struct inode *inode, struct file *file)
{
        int r = 0;
        struct dvb_frontend_private *fepriv = fe->frontend_priv;
        dtv_property_dump(tvp);

        /* Allow the frontend to validate incoming properties */
        if (fe->ops.set_property)
                r = fe->ops.set_property(fe, tvp);

        if (r < 0)
                return r;

        switch(tvp->cmd) {
        case DTV_CLEAR:
                /* Reset a cache of data specific to the frontend here. This does
                 * not effect hardware.
                 */
                dprintk("%s() Flushing property cache\n", __func__);
                memset(&fe->dtv_property_cache, 0, sizeof(struct dtv_frontend_properties));
                fe->dtv_property_cache.state = tvp->cmd;
                fe->dtv_property_cache.delivery_system = SYS_UNDEFINED;
                break;
        case DTV_TUNE:
                /* interpret the cache of data, build either a traditional frontend
                 * tunerequest so we can pass validation in the FE_SET_FRONTEND
                 * ioctl.
                 */
                fe->dtv_property_cache.state = tvp->cmd;
                dprintk("%s() Finalised property cache\n", __func__);
                dtv_property_cache_submit(fe);

                r |= dvb_frontend_ioctl_legacy(inode, file, FE_SET_FRONTEND,
                        &fepriv->parameters);
                break;
        case DTV_FREQUENCY:
                fe->dtv_property_cache.frequency = tvp->u.data;
                break;
        case DTV_MODULATION:
                fe->dtv_property_cache.modulation = tvp->u.data;
                break;
        case DTV_BANDWIDTH_HZ:
                fe->dtv_property_cache.bandwidth_hz = tvp->u.data;
                break;
        case DTV_INVERSION:
                fe->dtv_property_cache.inversion = tvp->u.data;
                break;
        case DTV_SYMBOL_RATE:
                fe->dtv_property_cache.symbol_rate = tvp->u.data;
                break;
        case DTV_INNER_FEC:
                fe->dtv_property_cache.fec_inner = tvp->u.data;
                break;
        case DTV_PILOT:
                fe->dtv_property_cache.pilot = tvp->u.data;
                break;
        case DTV_ROLLOFF:
                fe->dtv_property_cache.rolloff = tvp->u.data;
                break;
        case DTV_DELIVERY_SYSTEM:
                fe->dtv_property_cache.delivery_system = tvp->u.data;
                break;
        case DTV_VOLTAGE:
                fe->dtv_property_cache.voltage = tvp->u.data;
                r = dvb_frontend_ioctl_legacy(inode, file, FE_SET_VOLTAGE,
                        (void *)fe->dtv_property_cache.voltage);
                break;
        case DTV_TONE:
                fe->dtv_property_cache.sectone = tvp->u.data;
                r = dvb_frontend_ioctl_legacy(inode, file, FE_SET_TONE,
                        (void *)fe->dtv_property_cache.sectone);
                break;
        case DTV_CODE_RATE_HP:
                fe->dtv_property_cache.code_rate_HP = tvp->u.data;
                break;
        case DTV_CODE_RATE_LP:
                fe->dtv_property_cache.code_rate_LP = tvp->u.data;
                break;
        case DTV_GUARD_INTERVAL:
                fe->dtv_property_cache.guard_interval = tvp->u.data;
                break;
        case DTV_TRANSMISSION_MODE:
                fe->dtv_property_cache.transmission_mode = tvp->u.data;
                break;
        case DTV_HIERARCHY:
                fe->dtv_property_cache.hierarchy = tvp->u.data;
                break;
        default:
                r = -1;
        }

        return r;
}

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

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

        if (fepriv->exit)
                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;

        if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
                err = dvb_frontend_ioctl_properties(inode, file, cmd, parg);
        else {
                fe->dtv_property_cache.state = DTV_UNDEFINED;
                err = dvb_frontend_ioctl_legacy(inode, file, cmd, parg);
        }

        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;
        int err = 0;

        struct dtv_properties *tvps = NULL;
        struct dtv_property *tvp = NULL;
        int i;

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

        if(cmd == FE_SET_PROPERTY) {
                tvps = (struct dtv_properties __user *)parg;

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

                /* Put an arbitrary limit on the number of messages that can
                 * be sent at once */
                if ((tvps->num == 0) || (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++) {
                        (tvp + i)->result = dtv_property_process_set(fe, tvp + i, inode, file);
                        err |= (tvp + i)->result;
                }

                if(fe->dtv_property_cache.state == DTV_TUNE)
                        dprintk("%s() Property cache is full, tuning\n", __func__);

        } else
        if(cmd == FE_GET_PROPERTY) {

                tvps = (struct dtv_properties __user *)parg;

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

                /* Put an arbitrary limit on the number of messages that can
                 * be sent at once */
                if ((tvps->num == 0) || (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++) {
                        (tvp + i)->result = dtv_property_process_get(fe, tvp + i, inode, file);
                        err |= (tvp + i)->result;
                }

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

        } else
                err = -EOPNOTSUPP;

out:
        kfree(tvp);
        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;

        switch (cmd) {
        case FE_GET_INFO: {
                struct dvb_frontend_info* info = parg;
                memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
                dvb_frontend_get_frequeny_limits(fe, &info->frequency_min, &info->frequency_max);

                /* 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;
        }

        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;
                }

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

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

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

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


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

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

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

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

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

        case FE_DISHNETWORK_SEND_LEGACY_CMD:
                if (fe->ops.dishnetwork_send_legacy_command) {
                        err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
                        fepriv->state = FESTATE_DISEQC;
                        fepriv->status = 0;
                } else if (fe->ops.set_voltage) {
                        /*
                         * 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
                         */
                        unsigned long swcmd = ((unsigned long) parg) << 1;
                        struct timeval nexttime;
                        struct timeval tv[10];
                        int i;
                        u8 last = 1;
                        if (dvb_frontend_debug)
                                printk("%s switch command: 0x%04lx\n", __func__, swcmd);
                        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
                         */
                        fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
                        dvb_frontend_sleep_until(&nexttime, 32000);

                        for (i = 0; i < 9; i++) {
                                if (dvb_frontend_debug)
                                        do_gettimeofday(&tv[i + 1]);
                                if ((swcmd & 0x01) != last) {
                                        /* set voltage to (last ? 13V : 18V) */
                                        fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
                                        last = (last) ? 0 : 1;
                                }
                                swcmd = swcmd >> 1;
                                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",
                                        __func__, fe->dvb->num);
                                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;
                }
                break;

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

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

        case FE_SET_FRONTEND: {
                struct dvb_frontend_tune_settings fetunesettings;

                if(fe->dtv_property_cache.state == DTV_TUNE) {
                        if (dvb_frontend_check_parameters(fe, &fepriv->parameters) < 0) {
                                err = -EINVAL;
                                break;
                        }
                } else {
                        if (dvb_frontend_check_parameters(fe, parg) < 0) {
                                err = -EINVAL;
                                break;
                        }

                        memcpy (&fepriv->parameters, parg,
                                sizeof (struct dvb_frontend_parameters));
                        dtv_property_cache_sync(fe, &fepriv->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) {
                        fepriv->parameters.inversion = INVERSION_AUTO;
                        fetunesettings.parameters.inversion = INVERSION_AUTO;
                }
                if (fe->ops.info.type == FE_OFDM) {
                        /* without hierarchical coding code_rate_LP is irrelevant,
                         * 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 */
                if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
                        fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
                        fepriv->max_drift = fetunesettings.max_drift;
                        fepriv->step_size = fetunesettings.step_size;
                } else {
                        /* default values */
                        switch(fe->ops.info.type) {
                        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;
                                fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
                                fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
                                break;
                        case FE_ATSC:
                                fepriv->min_delay = HZ/20;
                                fepriv->step_size = 0;
                                fepriv->max_drift = 0;
                                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:
                if (fe->ops.get_frontend) {
                        memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
                        err = fe->ops.get_frontend(fe, (struct dvb_frontend_parameters*) parg);
                }
                break;

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

        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 *fe = dvbdev->priv;
        struct dvb_frontend_private *fepriv = fe->frontend_priv;

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

        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;
        struct dvb_frontend_private *fepriv = fe->frontend_priv;
        struct dvb_adapter *adapter = fe->dvb;
        int ret;

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

        if (adapter->mfe_shared) {
                mutex_lock (&adapter->mfe_lock);

                if (adapter->mfe_dvbdev == NULL)
                        adapter->mfe_dvbdev = dvbdev;

                else if (adapter->mfe_dvbdev != dvbdev) {
                        struct dvb_device
                                *mfedev = adapter->mfe_dvbdev;
                        struct dvb_frontend
                                *mfe = mfedev->priv;
                        struct dvb_frontend_private
                                *mfepriv = mfe->frontend_priv;
                        int mferetry = (dvb_mfe_wait_time << 1);

                        mutex_unlock (&adapter->mfe_lock);
                        while (mferetry-- && (mfedev->users != -1 ||
                                        mfepriv->thread != NULL)) {
                                if(msleep_interruptible(500)) {
                                        if(signal_pending(current))
                                                return -EINTR;
                                }
                        }

                        mutex_lock (&adapter->mfe_lock);
                        if(adapter->mfe_dvbdev != dvbdev) {
                                mfedev = adapter->mfe_dvbdev;
                                mfe = mfedev->priv;
                                mfepriv = mfe->frontend_priv;
                                if (mfedev->users != -1 ||
                                                mfepriv->thread != NULL) {
                                        mutex_unlock (&adapter->mfe_lock);
                                        return -EBUSY;
                                }
                                adapter->mfe_dvbdev = dvbdev;
                        }
                }
        }

        if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
                if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
                        goto err0;
        }

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

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

                ret = dvb_frontend_start (fe);
                if (ret)
                        goto err2;

                /*  empty event queue */
                fepriv->events.eventr = fepriv->events.eventw = 0;
        }

        if (adapter->mfe_shared)
                mutex_unlock (&adapter->mfe_lock);
        return ret;

err2:
        dvb_generic_release(inode, file);
err1:
        if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
                fe->ops.ts_bus_ctrl(fe, 0);
err0:
        if (adapter->mfe_shared)
                mutex_unlock (&adapter->mfe_lock);
        return ret;
}

static int dvb_frontend_release(struct inode *inode, struct file *file)
{
        struct dvb_device *dvbdev = file->private_data;
        struct dvb_frontend *fe = dvbdev->priv;
        struct dvb_frontend_private *fepriv = fe->frontend_priv;
        int ret;

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

        if ((file->f_flags & O_ACCMODE) != O_RDONLY)
                fepriv->release_jiffies = jiffies;

        ret = dvb_generic_release (inode, file);

        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);
        }

        return ret;
}

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
        };

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

        if (mutex_lock_interruptible(&frontend_mutex))
                return -ERESTARTSYS;

        fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
        if (fe->frontend_priv == NULL) {
                mutex_unlock(&frontend_mutex);
                return -ENOMEM;
        }
        fepriv = fe->frontend_priv;

        init_MUTEX (&fepriv->sem);
        init_waitqueue_head (&fepriv->wait_queue);
        init_waitqueue_head (&fepriv->events.wait_queue);
        mutex_init(&fepriv->events.mtx);
        fe->dvb = dvb;
        fepriv->inversion = INVERSION_OFF;

        printk ("DVB: registering adapter %i frontend %i (%s)...\n",
                fe->dvb->num,
                fe->id,
                fe->ops.info.name);

        dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
                             fe, DVB_DEVICE_FRONTEND);

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

int dvb_unregister_frontend(struct dvb_frontend* fe)
{
        struct dvb_frontend_private *fepriv = fe->frontend_priv;
        dprintk ("%s\n", __func__);

        mutex_lock(&frontend_mutex);
        dvb_frontend_stop (fe);
        mutex_unlock(&frontend_mutex);

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

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

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

#ifdef CONFIG_MEDIA_ATTACH
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);
        }
        if (fe->ops.analog_ops.release) {
                fe->ops.analog_ops.release(fe);
                symbol_put_addr(fe->ops.analog_ops.release);
        }
        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);
        if (fe->ops.analog_ops.release)
                fe->ops.analog_ops.release(fe);
        if (fe->ops.release)
                fe->ops.release(fe);
}
#endif
EXPORT_SYMBOL(dvb_frontend_detach);