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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * 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)
  */
 
 /* Enables DVBv3 compatibility bits at the headers */
 #define __DVB_CORE__
 
 #define pr_fmt(fmt) "dvb_frontend: " fmt
 
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/sched/signal.h>
 #include <linux/wait.h>
 #include <linux/slab.h>
 #include <linux/poll.h>
 #include <linux/semaphore.h>
 #include <linux/module.h>
 #include <linux/nospec.h>
 #include <linux/list.h>
 #include <linux/freezer.h>
 #include <linux/jiffies.h>
 #include <linux/kthread.h>
 #include <linux/ktime.h>
 #include <linux/compat.h>
 #include <asm/processor.h>
 
 #include <media/dvb_frontend.h>
 #include <media/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(fmt, arg...) \
     printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
 
 #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_ERROR 256
 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
 
 /*
  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  * FESTATE_TUNED. The frontend has successfully locked on.
  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  * FESTATE_DISEQC. A DISEQC command has just been issued.
  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  */
 
 static DEFINE_MUTEX(frontend_mutex);
 
 struct dvb_frontend_private {
     /* thread/frontend values */
     struct dvb_device *dvbdev;
     struct dvb_frontend_parameters parameters_out;
     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 wakeup;
     enum fe_status 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;
     enum dvbfe_search algo_status;
 
 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
     struct media_pipeline pipe;
 #endif
 };
 
 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
                     void (*release)(struct dvb_frontend *fe));
 
 static void __dvb_frontend_free(struct dvb_frontend *fe)
 {
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
 
     if (fepriv)
         dvb_free_device(fepriv->dvbdev);
 
     dvb_frontend_invoke_release(fe, fe->ops.release);
 
     kfree(fepriv);
 }
 
 static void dvb_frontend_free(struct kref *ref)
 {
     struct dvb_frontend *fe =
         container_of(ref, struct dvb_frontend, refcount);
 
     __dvb_frontend_free(fe);
 }
 
 static void dvb_frontend_put(struct dvb_frontend *fe)
 {
     /* call detach before dropping the reference count */
     if (fe->ops.detach)
         fe->ops.detach(fe);
     /*
      * Check if the frontend was registered, as otherwise
      * kref was not initialized yet.
      */
     if (fe->frontend_priv)
         kref_put(&fe->refcount, dvb_frontend_free);
     else
         __dvb_frontend_free(fe);
 }
 
 static void dvb_frontend_get(struct dvb_frontend *fe)
 {
     kref_get(&fe->refcount);
 }
 
 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 static int dtv_get_frontend(struct dvb_frontend *fe,
                 struct dtv_frontend_properties *c,
                 struct dvb_frontend_parameters *p_out);
 static int
 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
                 const struct dtv_frontend_properties *c,
                 struct dvb_frontend_parameters *p);
 
 static bool has_get_frontend(struct dvb_frontend *fe)
 {
     return fe->ops.get_frontend;
 }
 
 /*
  * Due to DVBv3 API calls, a delivery system should be mapped into one of
  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
  * otherwise, a DVBv3 call will fail.
  */
 enum dvbv3_emulation_type {
     DVBV3_UNKNOWN,
     DVBV3_QPSK,
     DVBV3_QAM,
     DVBV3_OFDM,
     DVBV3_ATSC,
 };
 
 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 {
     switch (delivery_system) {
     case SYS_DVBC_ANNEX_A:
     case SYS_DVBC_ANNEX_C:
         return DVBV3_QAM;
     case SYS_DVBS:
     case SYS_DVBS2:
     case SYS_TURBO:
     case SYS_ISDBS:
     case SYS_DSS:
         return DVBV3_QPSK;
     case SYS_DVBT:
     case SYS_DVBT2:
     case SYS_ISDBT:
     case SYS_DTMB:
         return DVBV3_OFDM;
     case SYS_ATSC:
     case SYS_ATSCMH:
     case SYS_DVBC_ANNEX_B:
         return DVBV3_ATSC;
     case SYS_UNDEFINED:
     case SYS_ISDBC:
     case SYS_DVBH:
     case SYS_DAB:
     default:
         /*
          * Doesn't know how to emulate those types and/or
          * there's no frontend driver from this type yet
          * with some emulation code, so, we're not sure yet how
          * to handle them, or they're not compatible with a DVBv3 call.
          */
         return DVBV3_UNKNOWN;
     }
 }
 
 static void dvb_frontend_add_event(struct dvb_frontend *fe,
                    enum fe_status status)
 {
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     struct dvb_fe_events *events = &fepriv->events;
     struct dvb_frontend_event *e;
     int wp;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
     if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
         dtv_get_frontend(fe, c, &fepriv->parameters_out);
 
     mutex_lock(&events->mtx);
 
     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];
     e->status = status;
     e->parameters = fepriv->parameters_out;
 
     events->eventw = wp;
 
     mutex_unlock(&events->mtx);
 
     wake_up_interruptible(&events->wait_queue);
 }
 
 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
                    struct dvb_fe_events *events)
 {
     int ret;
 
     up(&fepriv->sem);
     ret = events->eventw != events->eventr;
     down(&fepriv->sem);
 
     return ret;
 }
 
 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;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
     if (events->overflow) {
         events->overflow = 0;
         return -EOVERFLOW;
     }
 
     if (events->eventw == events->eventr) {
         int ret;
 
         if (flags & O_NONBLOCK)
             return -EWOULDBLOCK;
 
         ret = wait_event_interruptible(events->wait_queue,
                            dvb_frontend_test_event(fepriv, events));
 
         if (ret < 0)
             return ret;
     }
 
     mutex_lock(&events->mtx);
     *event = events->events[events->eventr];
     events->eventr = (events->eventr + 1) % MAX_EVENT;
     mutex_unlock(&events->mtx);
 
     return 0;
 }
 
 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 {
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     struct dvb_fe_events *events = &fepriv->events;
 
     mutex_lock(&events->mtx);
     events->eventr = events->eventw;
     mutex_unlock(&events->mtx);
 }
 
 static void dvb_frontend_init(struct dvb_frontend *fe)
 {
     dev_dbg(fe->dvb->device,
         "%s: initialising adapter %i frontend %i (%s)...\n",
         __func__, 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;
     struct dvb_frontend *fe = fepriv->dvbdev->priv;
 
     dev_dbg(fe->dvb->device, "%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);
 }
 
 /**
  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
  *  parameters.
  *
  * @fe: The frontend concerned.
  * @check_wrapped: Checks if an iteration has completed.
  *         DO NOT SET ON THE FIRST ATTEMPT.
  *
  * return: 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;
     int fe_set_err = 0;
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
     int original_inversion = c->inversion;
     u32 original_frequency = c->frequency;
 
     /* are we using autoinversion? */
     autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
              (c->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;
     }
 
     dev_dbg(fe->dvb->device,
         "%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 */
     c->frequency += fepriv->lnb_drift;
     if (autoinversion)
         c->inversion = fepriv->inversion;
     tmp = *c;
     if (fe->ops.set_frontend)
         fe_set_err = fe->ops.set_frontend(fe);
     *c = tmp;
     if (fe_set_err < 0) {
         fepriv->state = FESTATE_ERROR;
         return fe_set_err;
     }
 
     c->frequency = original_frequency;
     c->inversion = original_inversion;
 
     fepriv->auto_sub_step++;
     return 0;
 }
 
 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 {
     enum fe_status s = FE_NONE;
     int retval = 0;
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 
     if (fepriv->max_drift)
         dev_warn_once(fe->dvb->device,
                   "Frontend requested software zigzag, but didn't set the frequency step size\n");
 
     /* 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) {
             tmp = *c;
             if (fe->ops.set_frontend)
                 retval = fe->ops.set_frontend(fe);
             *c = tmp;
             if (retval < 0)
                 fepriv->state = FESTATE_ERROR;
             else
                 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)) &&
             (c->inversion == INVERSION_AUTO)) {
             c->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;
 
         /* perform a tune */
         retval = dvb_frontend_swzigzag_autotune(fe,
                             fepriv->check_wrapped);
         if (retval < 0) {
             return;
         } else if (retval) {
             /* 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 re-tuned, 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 (fe->exit != DVB_FE_NO_EXIT)
         return 1;
 
     if (fepriv->dvbdev->writers == 1)
         if (time_after_eq(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 dtv_frontend_properties *c = &fe->dtv_property_cache;
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     enum fe_status s = FE_NONE;
     enum dvbfe_algo algo;
     bool re_tune = false;
     bool semheld = false;
 
     dev_dbg(fe->dvb->device, "%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:
         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 */
             if (!down_interruptible(&fepriv->sem))
                 semheld = true;
             fe->exit = DVB_FE_NORMAL_EXIT;
             break;
         }
 
         if (try_to_freeze())
             goto restart;
 
         if (down_interruptible(&fepriv->sem))
             break;
 
         if (fepriv->reinitialise) {
             dvb_frontend_init(fe);
             if (fe->ops.set_tone && fepriv->tone != -1)
                 fe->ops.set_tone(fe, fepriv->tone);
             if (fe->ops.set_voltage && 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) {
             algo = fe->ops.get_frontend_algo(fe);
             switch (algo) {
             case DVBFE_ALGO_HW:
                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 
                 if (fepriv->state & FESTATE_RETUNE) {
                     dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
                     re_tune = true;
                     fepriv->state = FESTATE_TUNED;
                 } else {
                     re_tune = false;
                 }
 
                 if (fe->ops.tune)
                     fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 
                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
                     dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
                     dvb_frontend_add_event(fe, s);
                     fepriv->status = s;
                 }
                 break;
             case DVBFE_ALGO_SW:
                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
                 dvb_frontend_swzigzag(fe);
                 break;
             case DVBFE_ALGO_CUSTOM:
                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
                 if (fepriv->state & FESTATE_RETUNE) {
                     dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
                     fepriv->state = FESTATE_TUNED;
                 }
                 /* Case where we are going to search for a carrier
                  * User asked us to retune again for some reason, possibly
                  * requesting a search with a new set of parameters
                  */
                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
                     if (fe->ops.search) {
                         fepriv->algo_status = fe->ops.search(fe);
                         /* We did do a search as was requested, the flags are
                          * now unset as well and has the flags wrt to search.
                          */
                     } else {
                         fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
                     }
                 }
                 /* Track the carrier if the search was successful */
                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
                     fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
                     fepriv->delay = HZ / 2;
                 }
                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
                 fe->ops.read_status(fe, &s);
                 if (s != fepriv->status) {
                     dvb_frontend_add_event(fe, s); /* update event list */
                     fepriv->status = s;
                     if (!(s & FE_HAS_LOCK)) {
                         fepriv->delay = HZ / 10;
                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
                     } else {
                         fepriv->delay = 60 * HZ;
                     }
                 }
                 break;
             default:
                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
                 break;
             }
         } 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;
     if (kthread_should_stop())
         fe->exit = DVB_FE_DEVICE_REMOVED;
     else
         fe->exit = DVB_FE_NO_EXIT;
     mb();
 
     if (semheld)
         up(&fepriv->sem);
     dvb_frontend_wakeup(fe);
     return 0;
 }
 
 static void dvb_frontend_stop(struct dvb_frontend *fe)
 {
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
     if (fe->exit != DVB_FE_DEVICE_REMOVED)
         fe->exit = DVB_FE_NORMAL_EXIT;
     mb();
 
     if (!fepriv->thread)
         return;
 
     kthread_stop(fepriv->thread);
 
     sema_init(&fepriv->sem, 1);
     fepriv->state = FESTATE_IDLE;
 
     /* paranoia check in case a signal arrived */
     if (fepriv->thread)
         dev_warn(fe->dvb->device,
              "dvb_frontend_stop: warning: thread %p won't exit\n",
              fepriv->thread);
 }
 
 /*
  * Sleep for the amount of time given by add_usec parameter
  *
  * This needs to be as precise as possible, as it affects the detection of
  * the dish tone command at the satellite subsystem. The precision is improved
  * by using a scheduled msleep followed by udelay for the remainder.
  */
 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 {
     s32 delta;
 
     *waketime = ktime_add_us(*waketime, add_usec);
     delta = ktime_us_delta(ktime_get_boottime(), *waketime);
     if (delta > 2500) {
         msleep((delta - 1500) / 1000);
         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
     }
     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;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
     if (fepriv->thread) {
         if (fe->exit == DVB_FE_NO_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;
     fe->exit = DVB_FE_NO_EXIT;
     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);
         dev_warn(fe->dvb->device,
              "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_frequency_limits(struct dvb_frontend *fe,
                           u32 *freq_min, u32 *freq_max,
                           u32 *tolerance)
 {
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
     u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
     u32 frontend_min = fe->ops.info.frequency_min_hz;
     u32 frontend_max = fe->ops.info.frequency_max_hz;
 
     *freq_min = max(frontend_min, tuner_min);
 
     if (frontend_max == 0)
         *freq_max = tuner_max;
     else if (tuner_max == 0)
         *freq_max = frontend_max;
     else
         *freq_max = min(frontend_max, tuner_max);
 
     if (*freq_min == 0 || *freq_max == 0)
         dev_warn(fe->dvb->device,
              "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
              fe->dvb->num, fe->id);
 
     dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
         tuner_min, tuner_max, frontend_min, frontend_max);
 
     /* If the standard is for satellite, convert frequencies to kHz */
     switch (c->delivery_system) {
     case SYS_DVBS:
     case SYS_DVBS2:
     case SYS_TURBO:
     case SYS_ISDBS:
         *freq_min /= kHz;
         *freq_max /= kHz;
         if (tolerance)
             *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 
         break;
     default:
         if (tolerance)
             *tolerance = fe->ops.info.frequency_tolerance_hz;
         break;
     }
 }
 
 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 {
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     u32 fe_step = fe->ops.info.frequency_stepsize_hz;
     u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
     u32 step = max(fe_step, tuner_step);
 
     switch (c->delivery_system) {
     case SYS_DVBS:
     case SYS_DVBS2:
     case SYS_TURBO:
     case SYS_ISDBS:
         step /= kHz;
         break;
     default:
         break;
     }
 
     return step;
 }
 
 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 {
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     u32 freq_min;
     u32 freq_max;
 
     /* range check: frequency */
     dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
     if ((freq_min && c->frequency < freq_min) ||
         (freq_max && c->frequency > freq_max)) {
         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
              fe->dvb->num, fe->id, c->frequency,
              freq_min, freq_max);
         return -EINVAL;
     }
 
     /* range check: symbol rate */
     switch (c->delivery_system) {
     case SYS_DVBS:
     case SYS_DVBS2:
     case SYS_TURBO:
     case SYS_DVBC_ANNEX_A:
     case SYS_DVBC_ANNEX_C:
         if ((fe->ops.info.symbol_rate_min &&
              c->symbol_rate < fe->ops.info.symbol_rate_min) ||
             (fe->ops.info.symbol_rate_max &&
              c->symbol_rate > fe->ops.info.symbol_rate_max)) {
             dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
                  fe->dvb->num, fe->id, c->symbol_rate,
                  fe->ops.info.symbol_rate_min,
                  fe->ops.info.symbol_rate_max);
             return -EINVAL;
         }
         break;
     default:
         break;
     }
 
     return 0;
 }
 
 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 {
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     int i;
     u32 delsys;
 
     delsys = c->delivery_system;
     memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
     c->delivery_system = delsys;
 
     dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
         __func__, c->delivery_system);
 
     c->transmission_mode = TRANSMISSION_MODE_AUTO;
     c->bandwidth_hz = 0;    /* AUTO */
     c->guard_interval = GUARD_INTERVAL_AUTO;
     c->hierarchy = HIERARCHY_AUTO;
     c->symbol_rate = 0;
     c->code_rate_HP = FEC_AUTO;
     c->code_rate_LP = FEC_AUTO;
     c->fec_inner = FEC_AUTO;
     c->rolloff = ROLLOFF_AUTO;
     c->voltage = SEC_VOLTAGE_OFF;
     c->sectone = SEC_TONE_OFF;
     c->pilot = PILOT_AUTO;
 
     c->isdbt_partial_reception = 0;
     c->isdbt_sb_mode = 0;
     c->isdbt_sb_subchannel = 0;
     c->isdbt_sb_segment_idx = 0;
     c->isdbt_sb_segment_count = 0;
     c->isdbt_layer_enabled = 7; /* All layers (A,B,C) */
     for (i = 0; i < 3; i++) {
         c->layer[i].fec = FEC_AUTO;
         c->layer[i].modulation = QAM_AUTO;
         c->layer[i].interleaving = 0;
         c->layer[i].segment_count = 0;
     }
 
     c->stream_id = NO_STREAM_ID_FILTER;
     c->scrambling_sequence_index = 0;/* default sequence */
 
     switch (c->delivery_system) {
     case SYS_DVBS:
     case SYS_DVBS2:
     case SYS_TURBO:
         c->modulation = QPSK;   /* implied for DVB-S in legacy API */
         c->rolloff = ROLLOFF_35;/* implied for DVB-S */
         break;
     case SYS_ATSC:
         c->modulation = VSB_8;
         break;
     case SYS_ISDBS:
         c->symbol_rate = 28860000;
         c->rolloff = ROLLOFF_35;
         c->bandwidth_hz = c->symbol_rate / 100 * 135;
         break;
     default:
         c->modulation = QAM_AUTO;
         break;
     }
 
     c->lna = LNA_AUTO;
 
     return 0;
 }
 
 #define _DTV_CMD(n) \
     [n] =  #n
 
 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
     _DTV_CMD(DTV_TUNE),
     _DTV_CMD(DTV_CLEAR),
 
     /* Set */
     _DTV_CMD(DTV_FREQUENCY),
     _DTV_CMD(DTV_BANDWIDTH_HZ),
     _DTV_CMD(DTV_MODULATION),
     _DTV_CMD(DTV_INVERSION),
     _DTV_CMD(DTV_DISEQC_MASTER),
     _DTV_CMD(DTV_SYMBOL_RATE),
     _DTV_CMD(DTV_INNER_FEC),
     _DTV_CMD(DTV_VOLTAGE),
     _DTV_CMD(DTV_TONE),
     _DTV_CMD(DTV_PILOT),
     _DTV_CMD(DTV_ROLLOFF),
     _DTV_CMD(DTV_DELIVERY_SYSTEM),
     _DTV_CMD(DTV_HIERARCHY),
     _DTV_CMD(DTV_CODE_RATE_HP),
     _DTV_CMD(DTV_CODE_RATE_LP),
     _DTV_CMD(DTV_GUARD_INTERVAL),
     _DTV_CMD(DTV_TRANSMISSION_MODE),
     _DTV_CMD(DTV_INTERLEAVING),
 
     _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
     _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
     _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
     _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
     _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
     _DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
     _DTV_CMD(DTV_ISDBT_LAYERA_FEC),
     _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
     _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
     _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
     _DTV_CMD(DTV_ISDBT_LAYERB_FEC),
     _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
     _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
     _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
     _DTV_CMD(DTV_ISDBT_LAYERC_FEC),
     _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
     _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
     _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
 
     _DTV_CMD(DTV_STREAM_ID),
     _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
     _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
     _DTV_CMD(DTV_LNA),
 
     /* Get */
     _DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
     _DTV_CMD(DTV_API_VERSION),
 
     _DTV_CMD(DTV_ENUM_DELSYS),
 
     _DTV_CMD(DTV_ATSCMH_PARADE_ID),
     _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
 
     _DTV_CMD(DTV_ATSCMH_FIC_VER),
     _DTV_CMD(DTV_ATSCMH_NOG),
     _DTV_CMD(DTV_ATSCMH_TNOG),
     _DTV_CMD(DTV_ATSCMH_SGN),
     _DTV_CMD(DTV_ATSCMH_PRC),
     _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
     _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
     _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
     _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
     _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
     _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
     _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
     _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
 
     /* Statistics API */
     _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
     _DTV_CMD(DTV_STAT_CNR),
     _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
     _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
     _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
     _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
     _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
     _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
 };
 
 static char *dtv_cmd_name(u32 cmd)
 {
     cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
     return dtv_cmds[cmd];
 }
 
 /* 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.
  */
 static int dtv_property_cache_sync(struct dvb_frontend *fe,
                    struct dtv_frontend_properties *c,
                    const struct dvb_frontend_parameters *p)
 {
     c->frequency = p->frequency;
     c->inversion = p->inversion;
 
     switch (dvbv3_type(c->delivery_system)) {
     case DVBV3_QPSK:
         dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
         c->symbol_rate = p->u.qpsk.symbol_rate;
         c->fec_inner = p->u.qpsk.fec_inner;
         break;
     case DVBV3_QAM:
         dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
         c->symbol_rate = p->u.qam.symbol_rate;
         c->fec_inner = p->u.qam.fec_inner;
         c->modulation = p->u.qam.modulation;
         break;
     case DVBV3_OFDM:
         dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
 
         switch (p->u.ofdm.bandwidth) {
         case BANDWIDTH_10_MHZ:
             c->bandwidth_hz = 10000000;
             break;
         case BANDWIDTH_8_MHZ:
             c->bandwidth_hz = 8000000;
             break;
         case BANDWIDTH_7_MHZ:
             c->bandwidth_hz = 7000000;
             break;
         case BANDWIDTH_6_MHZ:
             c->bandwidth_hz = 6000000;
             break;
         case BANDWIDTH_5_MHZ:
             c->bandwidth_hz = 5000000;
             break;
         case BANDWIDTH_1_712_MHZ:
             c->bandwidth_hz = 1712000;
             break;
         case 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;
         break;
     case DVBV3_ATSC:
         dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
         c->modulation = p->u.vsb.modulation;
         if (c->delivery_system == SYS_ATSCMH)
             break;
         if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
             c->delivery_system = SYS_ATSC;
         else
             c->delivery_system = SYS_DVBC_ANNEX_B;
         break;
     case DVBV3_UNKNOWN:
         dev_err(fe->dvb->device,
             "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
             __func__, c->delivery_system);
         return -EINVAL;
     }
 
     return 0;
 }
 
 /* Ensure the cached values are set correctly in the frontend
  * legacy tuning structures, for the advanced tuning API.
  */
 static int
 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
                 const struct dtv_frontend_properties *c,
                 struct dvb_frontend_parameters *p)
 {
     p->frequency = c->frequency;
     p->inversion = c->inversion;
 
     switch (dvbv3_type(c->delivery_system)) {
     case DVBV3_UNKNOWN:
         dev_err(fe->dvb->device,
             "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
             __func__, c->delivery_system);
         return -EINVAL;
     case DVBV3_QPSK:
         dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
         p->u.qpsk.symbol_rate = c->symbol_rate;
         p->u.qpsk.fec_inner = c->fec_inner;
         break;
     case DVBV3_QAM:
         dev_dbg(fe->dvb->device, "%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;
         break;
     case DVBV3_OFDM:
         dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
         switch (c->bandwidth_hz) {
         case 10000000:
             p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
             break;
         case 8000000:
             p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
             break;
         case 7000000:
             p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
             break;
         case 6000000:
             p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
             break;
         case 5000000:
             p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
             break;
         case 1712000:
             p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
             break;
         case 0:
         default:
             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;
         break;
     case DVBV3_ATSC:
         dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
         p->u.vsb.modulation = c->modulation;
         break;
     }
     return 0;
 }
 
 /**
  * dtv_get_frontend - calls a callback for retrieving DTV parameters
  * @fe:     struct dvb_frontend pointer
  * @c:      struct dtv_frontend_properties pointer (DVBv5 cache)
  * @p_out:  struct dvb_frontend_parameters pointer (DVBv3 FE struct)
  *
  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
  * If c is not null, it will update the DVBv5 cache struct pointed by it.
  * If p_out is not null, it will update the DVBv3 params pointed by it.
  */
 static int dtv_get_frontend(struct dvb_frontend *fe,
                 struct dtv_frontend_properties *c,
                 struct dvb_frontend_parameters *p_out)
 {
     int r;
 
     if (fe->ops.get_frontend) {
         r = fe->ops.get_frontend(fe, c);
         if (unlikely(r < 0))
             return r;
         if (p_out)
             dtv_property_legacy_params_sync(fe, c, p_out);
         return 0;
     }
 
     /* As everything is in cache, get_frontend fops are always supported */
     return 0;
 }
 
 static int dvb_frontend_handle_ioctl(struct file *file,
                      unsigned int cmd, void *parg);
 
 static int dtv_property_process_get(struct dvb_frontend *fe,
                     const struct dtv_frontend_properties *c,
                     struct dtv_property *tvp,
                     struct file *file)
 {
     int ncaps;
     unsigned int len = 1;
 
     switch (tvp->cmd) {
     case DTV_ENUM_DELSYS:
         ncaps = 0;
         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
             tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
             ncaps++;
         }
         tvp->u.buffer.len = ncaps;
         len = ncaps;
         break;
     case DTV_FREQUENCY:
         tvp->u.data = c->frequency;
         break;
     case DTV_MODULATION:
         tvp->u.data = c->modulation;
         break;
     case DTV_BANDWIDTH_HZ:
         tvp->u.data = c->bandwidth_hz;
         break;
     case DTV_INVERSION:
         tvp->u.data = c->inversion;
         break;
     case DTV_SYMBOL_RATE:
         tvp->u.data = c->symbol_rate;
         break;
     case DTV_INNER_FEC:
         tvp->u.data = c->fec_inner;
         break;
     case DTV_PILOT:
         tvp->u.data = c->pilot;
         break;
     case DTV_ROLLOFF:
         tvp->u.data = c->rolloff;
         break;
     case DTV_DELIVERY_SYSTEM:
         tvp->u.data = c->delivery_system;
         break;
     case DTV_VOLTAGE:
         tvp->u.data = c->voltage;
         break;
     case DTV_TONE:
         tvp->u.data = c->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 = c->code_rate_HP;
         break;
     case DTV_CODE_RATE_LP:
         tvp->u.data = c->code_rate_LP;
         break;
     case DTV_GUARD_INTERVAL:
         tvp->u.data = c->guard_interval;
         break;
     case DTV_TRANSMISSION_MODE:
         tvp->u.data = c->transmission_mode;
         break;
     case DTV_HIERARCHY:
         tvp->u.data = c->hierarchy;
         break;
     case DTV_INTERLEAVING:
         tvp->u.data = c->interleaving;
         break;
 
     /* ISDB-T Support here */
     case DTV_ISDBT_PARTIAL_RECEPTION:
         tvp->u.data = c->isdbt_partial_reception;
         break;
     case DTV_ISDBT_SOUND_BROADCASTING:
         tvp->u.data = c->isdbt_sb_mode;
         break;
     case DTV_ISDBT_SB_SUBCHANNEL_ID:
         tvp->u.data = c->isdbt_sb_subchannel;
         break;
     case DTV_ISDBT_SB_SEGMENT_IDX:
         tvp->u.data = c->isdbt_sb_segment_idx;
         break;
     case DTV_ISDBT_SB_SEGMENT_COUNT:
         tvp->u.data = c->isdbt_sb_segment_count;
         break;
     case DTV_ISDBT_LAYER_ENABLED:
         tvp->u.data = c->isdbt_layer_enabled;
         break;
     case DTV_ISDBT_LAYERA_FEC:
         tvp->u.data = c->layer[0].fec;
         break;
     case DTV_ISDBT_LAYERA_MODULATION:
         tvp->u.data = c->layer[0].modulation;
         break;
     case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
         tvp->u.data = c->layer[0].segment_count;
         break;
     case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
         tvp->u.data = c->layer[0].interleaving;
         break;
     case DTV_ISDBT_LAYERB_FEC:
         tvp->u.data = c->layer[1].fec;
         break;
     case DTV_ISDBT_LAYERB_MODULATION:
         tvp->u.data = c->layer[1].modulation;
         break;
     case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
         tvp->u.data = c->layer[1].segment_count;
         break;
     case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
         tvp->u.data = c->layer[1].interleaving;
         break;
     case DTV_ISDBT_LAYERC_FEC:
         tvp->u.data = c->layer[2].fec;
         break;
     case DTV_ISDBT_LAYERC_MODULATION:
         tvp->u.data = c->layer[2].modulation;
         break;
     case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
         tvp->u.data = c->layer[2].segment_count;
         break;
     case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
         tvp->u.data = c->layer[2].interleaving;
         break;
 
     /* Multistream support */
     case DTV_STREAM_ID:
     case DTV_DVBT2_PLP_ID_LEGACY:
         tvp->u.data = c->stream_id;
         break;
 
     /* Physical layer scrambling support */
     case DTV_SCRAMBLING_SEQUENCE_INDEX:
         tvp->u.data = c->scrambling_sequence_index;
         break;
 
     /* ATSC-MH */
     case DTV_ATSCMH_FIC_VER:
         tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
         break;
     case DTV_ATSCMH_PARADE_ID:
         tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
         break;
     case DTV_ATSCMH_NOG:
         tvp->u.data = fe->dtv_property_cache.atscmh_nog;
         break;
     case DTV_ATSCMH_TNOG:
         tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
         break;
     case DTV_ATSCMH_SGN:
         tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
         break;
     case DTV_ATSCMH_PRC:
         tvp->u.data = fe->dtv_property_cache.atscmh_prc;
         break;
     case DTV_ATSCMH_RS_FRAME_MODE:
         tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
         break;
     case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
         tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
         break;
     case DTV_ATSCMH_RS_CODE_MODE_PRI:
         tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
         break;
     case DTV_ATSCMH_RS_CODE_MODE_SEC:
         tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
         break;
     case DTV_ATSCMH_SCCC_BLOCK_MODE:
         tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
         break;
     case DTV_ATSCMH_SCCC_CODE_MODE_A:
         tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
         break;
     case DTV_ATSCMH_SCCC_CODE_MODE_B:
         tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
         break;
     case DTV_ATSCMH_SCCC_CODE_MODE_C:
         tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
         break;
     case DTV_ATSCMH_SCCC_CODE_MODE_D:
         tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
         break;
 
     case DTV_LNA:
         tvp->u.data = c->lna;
         break;
 
     /* Fill quality measures */
     case DTV_STAT_SIGNAL_STRENGTH:
         tvp->u.st = c->strength;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     case DTV_STAT_CNR:
         tvp->u.st = c->cnr;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     case DTV_STAT_PRE_ERROR_BIT_COUNT:
         tvp->u.st = c->pre_bit_error;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     case DTV_STAT_PRE_TOTAL_BIT_COUNT:
         tvp->u.st = c->pre_bit_count;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     case DTV_STAT_POST_ERROR_BIT_COUNT:
         tvp->u.st = c->post_bit_error;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     case DTV_STAT_POST_TOTAL_BIT_COUNT:
         tvp->u.st = c->post_bit_count;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     case DTV_STAT_ERROR_BLOCK_COUNT:
         tvp->u.st = c->block_error;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     case DTV_STAT_TOTAL_BLOCK_COUNT:
         tvp->u.st = c->block_count;
         if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
             tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
         len = tvp->u.buffer.len;
         break;
     default:
         dev_dbg(fe->dvb->device,
             "%s: FE property %d doesn't exist\n",
             __func__, tvp->cmd);
         return -EINVAL;
     }
 
     if (len < 1)
         len = 1;
 
     dev_dbg(fe->dvb->device,
         "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
         __func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
         tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
 
     return 0;
 }
 
 static int dtv_set_frontend(struct dvb_frontend *fe);
 
 static bool is_dvbv3_delsys(u32 delsys)
 {
     return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
            (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
 }
 
 /**
  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
  * @fe:         struct frontend;
  * @delsys:         DVBv5 type that will be used for emulation
  *
  * Provides emulation for delivery systems that are compatible with the old
  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
  * parameters are compatible with DVB-S spec.
  */
 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
 {
     int i;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 
     c->delivery_system = delsys;
 
     /*
      * If the call is for ISDB-T, put it into full-seg, auto mode, TV
      */
     if (c->delivery_system == SYS_ISDBT) {
         dev_dbg(fe->dvb->device,
             "%s: Using defaults for SYS_ISDBT\n",
             __func__);
 
         if (!c->bandwidth_hz)
             c->bandwidth_hz = 6000000;
 
         c->isdbt_partial_reception = 0;
         c->isdbt_sb_mode = 0;
         c->isdbt_sb_subchannel = 0;
         c->isdbt_sb_segment_idx = 0;
         c->isdbt_sb_segment_count = 0;
         c->isdbt_layer_enabled = 7;
         for (i = 0; i < 3; i++) {
             c->layer[i].fec = FEC_AUTO;
             c->layer[i].modulation = QAM_AUTO;
             c->layer[i].interleaving = 0;
             c->layer[i].segment_count = 0;
         }
     }
     dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
         __func__, c->delivery_system);
 
     return 0;
 }
 
 /**
  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
  * @fe:         frontend struct
  * @desired_system: delivery system requested by the user
  *
  * A DVBv5 call know what's the desired system it wants. So, set it.
  *
  * There are, however, a few known issues with early DVBv5 applications that
  * are also handled by this logic:
  *
  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
  *    This is an API violation, but, as we don't want to break userspace,
  *    convert it to the first supported delivery system.
  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
  *    ISDB-T provided backward compat with DVB-T.
  */
 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
                      u32 desired_system)
 {
     int ncaps;
     u32 delsys = SYS_UNDEFINED;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     enum dvbv3_emulation_type type;
 
     /*
      * It was reported that some old DVBv5 applications were
      * filling delivery_system with SYS_UNDEFINED. If this happens,
      * assume that the application wants to use the first supported
      * delivery system.
      */
     if (desired_system == SYS_UNDEFINED)
         desired_system = fe->ops.delsys[0];
 
     /*
      * This is a DVBv5 call. So, it likely knows the supported
      * delivery systems. So, check if the desired delivery system is
      * supported
      */
     ncaps = 0;
     while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
         if (fe->ops.delsys[ncaps] == desired_system) {
             c->delivery_system = desired_system;
             dev_dbg(fe->dvb->device,
                 "%s: Changing delivery system to %d\n",
                 __func__, desired_system);
             return 0;
         }
         ncaps++;
     }
 
     /*
      * The requested delivery system isn't supported. Maybe userspace
      * is requesting a DVBv3 compatible delivery system.
      *
      * The emulation only works if the desired system is one of the
      * delivery systems supported by DVBv3 API
      */
     if (!is_dvbv3_delsys(desired_system)) {
         dev_dbg(fe->dvb->device,
             "%s: Delivery system %d not supported.\n",
             __func__, desired_system);
         return -EINVAL;
     }
 
     type = dvbv3_type(desired_system);
 
     /*
     * Get the last non-DVBv3 delivery system that has the same type
     * of the desired system
     */
     ncaps = 0;
     while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
         if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
             delsys = fe->ops.delsys[ncaps];
         ncaps++;
     }
 
     /* There's nothing compatible with the desired delivery system */
     if (delsys == SYS_UNDEFINED) {
         dev_dbg(fe->dvb->device,
             "%s: Delivery system %d not supported on emulation mode.\n",
             __func__, desired_system);
         return -EINVAL;
     }
 
     dev_dbg(fe->dvb->device,
         "%s: Using delivery system %d emulated as if it were %d\n",
         __func__, delsys, desired_system);
 
     return emulate_delivery_system(fe, desired_system);
 }
 
 /**
  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
  * @fe: frontend struct
  *
  * A DVBv3 call doesn't know what's the desired system it wants. It also
  * doesn't allow to switch between different types. Due to that, userspace
  * should use DVBv5 instead.
  * However, in order to avoid breaking userspace API, limited backward
  * compatibility support is provided.
  *
  * There are some delivery systems that are incompatible with DVBv3 calls.
  *
  * This routine should work fine for frontends that support just one delivery
  * system.
  *
  * For frontends that support multiple frontends:
  * 1) It defaults to use the first supported delivery system. There's an
  *    userspace application that allows changing it at runtime;
  *
  * 2) If the current delivery system is not compatible with DVBv3, it gets
  *    the first one that it is compatible.
  *
  * NOTE: in order for this to work with applications like Kaffeine that
  *  uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
  *  DVB-S, drivers that support both DVB-S and DVB-S2 should have the
  *  SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
  *  to DVB-S.
  */
 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
 {
     int ncaps;
     u32 delsys = SYS_UNDEFINED;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 
     /* If not set yet, defaults to the first supported delivery system */
     if (c->delivery_system == SYS_UNDEFINED)
         c->delivery_system = fe->ops.delsys[0];
 
     /*
      * Trivial case: just use the current one, if it already a DVBv3
      * delivery system
      */
     if (is_dvbv3_delsys(c->delivery_system)) {
         dev_dbg(fe->dvb->device,
             "%s: Using delivery system to %d\n",
             __func__, c->delivery_system);
         return 0;
     }
 
     /*
      * Seek for the first delivery system that it is compatible with a
      * DVBv3 standard
      */
     ncaps = 0;
     while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
         if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
             delsys = fe->ops.delsys[ncaps];
             break;
         }
         ncaps++;
     }
     if (delsys == SYS_UNDEFINED) {
         dev_dbg(fe->dvb->device,
             "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
             __func__);
         return -EINVAL;
     }
     return emulate_delivery_system(fe, delsys);
 }
 
 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
 {
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     struct dvb_frontend_tune_settings fetunesettings = { 0 };
 
     /* 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 (c->delivery_system) {
         case SYS_DVBS:
         case SYS_DVBS2:
         case SYS_ISDBS:
         case SYS_TURBO:
         case SYS_DVBC_ANNEX_A:
         case SYS_DVBC_ANNEX_C:
             fepriv->min_delay = HZ / 20;
             fepriv->step_size = c->symbol_rate / 16000;
             fepriv->max_drift = c->symbol_rate / 2000;
             break;
         case SYS_DVBT:
         case SYS_DVBT2:
         case SYS_ISDBT:
         case SYS_DTMB:
             fepriv->min_delay = HZ / 20;
             fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
             fepriv->max_drift = fepriv->step_size + 1;
             break;
         default:
             /*
              * FIXME: This sounds wrong! if freqency_stepsize is
              * defined by the frontend, why not use it???
              */
             fepriv->min_delay = HZ / 20;
             fepriv->step_size = 0; /* no zigzag */
             fepriv->max_drift = 0;
             break;
         }
     }
     if (dvb_override_tune_delay > 0)
         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
 }
 
 /**
  * dtv_property_process_set -  Sets a single DTV property
  * @fe:     Pointer to &struct dvb_frontend
  * @file:   Pointer to &struct file
  * @cmd:    Digital TV command
  * @data:   An unsigned 32-bits number
  *
  * This routine assigns the property
  * value to the corresponding member of
  * &struct dtv_frontend_properties
  *
  * Returns:
  * Zero on success, negative errno on failure.
  */
 static int dtv_property_process_set(struct dvb_frontend *fe,
                     struct file *file,
                     u32 cmd, u32 data)
 {
     int r = 0;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 
     /** Dump DTV command name and value*/
     if (!cmd || cmd > DTV_MAX_COMMAND)
         dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
              __func__, cmd);
     else
         dev_dbg(fe->dvb->device,
             "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
             __func__, cmd, dtv_cmd_name(cmd), data);
     switch (cmd) {
     case DTV_CLEAR:
         /*
          * Reset a cache of data specific to the frontend here. This does
          * not effect hardware.
          */
         dvb_frontend_clear_cache(fe);
         break;
     case DTV_TUNE:
         /*
          * Use the cached Digital TV properties to tune the
          * frontend
          */
         dev_dbg(fe->dvb->device,
             "%s: Setting the frontend from property cache\n",
             __func__);
 
         r = dtv_set_frontend(fe);
         break;
     case DTV_FREQUENCY:
         c->frequency = data;
         break;
     case DTV_MODULATION:
         c->modulation = data;
         break;
     case DTV_BANDWIDTH_HZ:
         c->bandwidth_hz = data;
         break;
     case DTV_INVERSION:
         c->inversion = data;
         break;
     case DTV_SYMBOL_RATE:
         c->symbol_rate = data;
         break;
     case DTV_INNER_FEC:
         c->fec_inner = data;
         break;
     case DTV_PILOT:
         c->pilot = data;
         break;
     case DTV_ROLLOFF:
         c->rolloff = data;
         break;
     case DTV_DELIVERY_SYSTEM:
         r = dvbv5_set_delivery_system(fe, data);
         break;
     case DTV_VOLTAGE:
         c->voltage = data;
         r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
                           (void *)c->voltage);
         break;
     case DTV_TONE:
         c->sectone = data;
         r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
                           (void *)c->sectone);
         break;
     case DTV_CODE_RATE_HP:
         c->code_rate_HP = data;
         break;
     case DTV_CODE_RATE_LP:
         c->code_rate_LP = data;
         break;
     case DTV_GUARD_INTERVAL:
         c->guard_interval = data;
         break;
     case DTV_TRANSMISSION_MODE:
         c->transmission_mode = data;
         break;
     case DTV_HIERARCHY:
         c->hierarchy = data;
         break;
     case DTV_INTERLEAVING:
         c->interleaving = data;
         break;
 
     /* ISDB-T Support here */
     case DTV_ISDBT_PARTIAL_RECEPTION:
         c->isdbt_partial_reception = data;
         break;
     case DTV_ISDBT_SOUND_BROADCASTING:
         c->isdbt_sb_mode = data;
         break;
     case DTV_ISDBT_SB_SUBCHANNEL_ID:
         c->isdbt_sb_subchannel = data;
         break;
     case DTV_ISDBT_SB_SEGMENT_IDX:
         c->isdbt_sb_segment_idx = data;
         break;
     case DTV_ISDBT_SB_SEGMENT_COUNT:
         c->isdbt_sb_segment_count = data;
         break;
     case DTV_ISDBT_LAYER_ENABLED:
         c->isdbt_layer_enabled = data;
         break;
     case DTV_ISDBT_LAYERA_FEC:
         c->layer[0].fec = data;
         break;
     case DTV_ISDBT_LAYERA_MODULATION:
         c->layer[0].modulation = data;
         break;
     case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
         c->layer[0].segment_count = data;
         break;
     case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
         c->layer[0].interleaving = data;
         break;
     case DTV_ISDBT_LAYERB_FEC:
         c->layer[1].fec = data;
         break;
     case DTV_ISDBT_LAYERB_MODULATION:
         c->layer[1].modulation = data;
         break;
     case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
         c->layer[1].segment_count = data;
         break;
     case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
         c->layer[1].interleaving = data;
         break;
     case DTV_ISDBT_LAYERC_FEC:
         c->layer[2].fec = data;
         break;
     case DTV_ISDBT_LAYERC_MODULATION:
         c->layer[2].modulation = data;
         break;
     case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
         c->layer[2].segment_count = data;
         break;
     case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
         c->layer[2].interleaving = data;
         break;
 
     /* Multistream support */
     case DTV_STREAM_ID:
     case DTV_DVBT2_PLP_ID_LEGACY:
         c->stream_id = data;
         break;
 
     /* Physical layer scrambling support */
     case DTV_SCRAMBLING_SEQUENCE_INDEX:
         c->scrambling_sequence_index = data;
         break;
 
     /* ATSC-MH */
     case DTV_ATSCMH_PARADE_ID:
         fe->dtv_property_cache.atscmh_parade_id = data;
         break;
     case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
         fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
         break;
 
     case DTV_LNA:
         c->lna = data;
         if (fe->ops.set_lna)
             r = fe->ops.set_lna(fe);
         if (r < 0)
             c->lna = LNA_AUTO;
         break;
 
     default:
         return -EINVAL;
     }
 
     return r;
 }
 
 static int dvb_frontend_do_ioctl(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;
 
     dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
     if (down_interruptible(&fepriv->sem))
         return -ERESTARTSYS;
 
     if (fe->exit != DVB_FE_NO_EXIT) {
         up(&fepriv->sem);
         return -ENODEV;
     }
 
     /*
      * If the frontend is opened in read-only mode, only the ioctls
      * that don't interfere with the tune logic should be accepted.
      * That allows an external application to monitor the DVB QoS and
      * statistics parameters.
      *
      * That matches all _IOR() ioctls, except for two special cases:
      *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
      *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
      *     setup
      * So, those two ioctls should also return -EPERM, as otherwise
      * reading from them would interfere with a DVB tune application
      */
     if ((file->f_flags & O_ACCMODE) == O_RDONLY
         && (_IOC_DIR(cmd) != _IOC_READ
         || cmd == FE_GET_EVENT
         || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
         up(&fepriv->sem);
         return -EPERM;
     }
 
     err = dvb_frontend_handle_ioctl(file, cmd, parg);
 
     up(&fepriv->sem);
     return err;
 }
 
 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
                    unsigned long arg)
 {
     struct dvb_device *dvbdev = file->private_data;
 
     if (!dvbdev)
         return -ENODEV;
 
     return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
 }
 
 #ifdef CONFIG_COMPAT
 struct compat_dtv_property {
     __u32 cmd;
     __u32 reserved[3];
     union {
         __u32 data;
         struct dtv_fe_stats st;
         struct {
             __u8 data[32];
             __u32 len;
             __u32 reserved1[3];
             compat_uptr_t reserved2;
         } buffer;
     } u;
     int result;
 } __attribute__ ((packed));
 
 struct compat_dtv_properties {
     __u32 num;
     compat_uptr_t props;
 };
 
 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
 
 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
                         unsigned long arg)
 {
     struct dvb_device *dvbdev = file->private_data;
     struct dvb_frontend *fe = dvbdev->priv;
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     int i, err = 0;
 
     if (cmd == COMPAT_FE_SET_PROPERTY) {
         struct compat_dtv_properties prop, *tvps = NULL;
         struct compat_dtv_property *tvp = NULL;
 
         if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
             return -EFAULT;
 
         tvps = &prop;
 
         /*
          * Put an arbitrary limit on the number of messages that can
          * be sent at once
          */
         if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
             return -EINVAL;
 
         tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
         if (IS_ERR(tvp))
             return PTR_ERR(tvp);
 
         for (i = 0; i < tvps->num; i++) {
             err = dtv_property_process_set(fe, file,
                                (tvp + i)->cmd,
                                (tvp + i)->u.data);
             if (err < 0) {
                 kfree(tvp);
                 return err;
             }
         }
         kfree(tvp);
     } else if (cmd == COMPAT_FE_GET_PROPERTY) {
         struct compat_dtv_properties prop, *tvps = NULL;
         struct compat_dtv_property *tvp = NULL;
         struct dtv_frontend_properties getp = fe->dtv_property_cache;
 
         if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
             return -EFAULT;
 
         tvps = &prop;
 
         /*
          * Put an arbitrary limit on the number of messages that can
          * be sent at once
          */
         if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
             return -EINVAL;
 
         tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
         if (IS_ERR(tvp))
             return PTR_ERR(tvp);
 
         /*
          * Let's use our own copy of property cache, in order to
          * avoid mangling with DTV zigzag logic, as drivers might
          * return crap, if they don't check if the data is available
          * before updating the properties cache.
          */
         if (fepriv->state != FESTATE_IDLE) {
             err = dtv_get_frontend(fe, &getp, NULL);
             if (err < 0) {
                 kfree(tvp);
                 return err;
             }
         }
         for (i = 0; i < tvps->num; i++) {
             err = dtv_property_process_get(
                 fe, &getp, (struct dtv_property *)(tvp + i), file);
             if (err < 0) {
                 kfree(tvp);
                 return err;
             }
         }
 
         if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
                  tvps->num * sizeof(struct compat_dtv_property))) {
             kfree(tvp);
             return -EFAULT;
         }
         kfree(tvp);
     }
 
     return err;
 }
 
 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
                       unsigned long arg)
 {
     struct dvb_device *dvbdev = file->private_data;
     struct dvb_frontend *fe = dvbdev->priv;
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     int err;
 
     if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
         if (down_interruptible(&fepriv->sem))
             return -ERESTARTSYS;
 
         err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
 
         up(&fepriv->sem);
         return err;
     }
 
     return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 }
 #endif
 
 static int dtv_set_frontend(struct dvb_frontend *fe)
 {
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     u32 rolloff = 0;
 
     if (dvb_frontend_check_parameters(fe) < 0)
         return -EINVAL;
 
     /*
      * Initialize output parameters to match the values given by
      * the user. FE_SET_FRONTEND triggers an initial frontend event
      * with status = 0, which copies output parameters to userspace.
      */
     dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 
     /*
      * Be sure that the bandwidth will be filled for all
      * non-satellite systems, as tuners need to know what
      * low pass/Nyquist half filter should be applied, in
      * order to avoid inter-channel noise.
      *
      * ISDB-T and DVB-T/T2 already sets bandwidth.
      * ATSC and DVB-C don't set, so, the core should fill it.
      *
      * On DVB-C Annex A and C, the bandwidth is a function of
      * the roll-off and symbol rate. Annex B defines different
      * roll-off factors depending on the modulation. Fortunately,
      * Annex B is only used with 6MHz, so there's no need to
      * calculate it.
      *
      * While not officially supported, a side effect of handling it at
      * the cache level is that a program could retrieve the bandwidth
      * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
      */
     switch (c->delivery_system) {
     case SYS_ATSC:
     case SYS_DVBC_ANNEX_B:
         c->bandwidth_hz = 6000000;
         break;
     case SYS_DVBC_ANNEX_A:
         rolloff = 115;
         break;
     case SYS_DVBC_ANNEX_C:
         rolloff = 113;
         break;
     case SYS_DVBS:
     case SYS_TURBO:
     case SYS_ISDBS:
         rolloff = 135;
         break;
     case SYS_DVBS2:
         switch (c->rolloff) {
         case ROLLOFF_20:
             rolloff = 120;
             break;
         case ROLLOFF_25:
             rolloff = 125;
             break;
         default:
         case ROLLOFF_35:
             rolloff = 135;
         }
         break;
     default:
         break;
     }
     if (rolloff)
         c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
 
     /* force auto frequency inversion if requested */
     if (dvb_force_auto_inversion)
         c->inversion = INVERSION_AUTO;
 
     /*
      * without hierarchical coding code_rate_LP is irrelevant,
      * so we tolerate the otherwise invalid FEC_NONE setting
      */
     if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
         c->code_rate_LP = FEC_AUTO;
 
     prepare_tuning_algo_parameters(fe);
 
     fepriv->state = FESTATE_RETUNE;
 
     /* Request the search algorithm to search */
     fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 
     dvb_frontend_clear_events(fe);
     dvb_frontend_add_event(fe, 0);
     dvb_frontend_wakeup(fe);
     fepriv->status = 0;
 
     return 0;
 }
 
 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
                 struct dtv_properties *tvps)
 {
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     struct dtv_property *tvp = NULL;
     struct dtv_frontend_properties getp;
     int i, err;
 
     memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
 
     dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
         __func__, tvps->num);
     dev_dbg(fe->dvb->device, "%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 || tvps->num > DTV_IOCTL_MAX_MSGS)
         return -EINVAL;
 
     tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
     if (IS_ERR(tvp))
         return PTR_ERR(tvp);
 
     /*
      * Let's use our own copy of property cache, in order to
      * avoid mangling with DTV zigzag logic, as drivers might
      * return crap, if they don't check if the data is available
      * before updating the properties cache.
      */
     if (fepriv->state != FESTATE_IDLE) {
         err = dtv_get_frontend(fe, &getp, NULL);
         if (err < 0)
             goto out;
     }
     for (i = 0; i < tvps->num; i++) {
         err = dtv_property_process_get(fe, &getp,
                            tvp + i, file);
         if (err < 0)
             goto out;
     }
 
     if (copy_to_user((void __user *)tvps->props, tvp,
              tvps->num * sizeof(struct dtv_property))) {
         err = -EFAULT;
         goto out;
     }
 
     err = 0;
 out:
     kfree(tvp);
     return err;
 }
 
 static int dvb_get_frontend(struct dvb_frontend *fe,
                 struct dvb_frontend_parameters *p_out)
 {
     struct dtv_frontend_properties getp;
 
     /*
      * Let's use our own copy of property cache, in order to
      * avoid mangling with DTV zigzag logic, as drivers might
      * return crap, if they don't check if the data is available
      * before updating the properties cache.
      */
     memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
 
     return dtv_get_frontend(fe, &getp, p_out);
 }
 
 static int dvb_frontend_handle_ioctl(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;
     struct dtv_frontend_properties *c = &fe->dtv_property_cache;
     int i, err = -ENOTSUPP;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
     switch (cmd) {
     case FE_SET_PROPERTY: {
         struct dtv_properties *tvps = parg;
         struct dtv_property *tvp = NULL;
 
         dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
             __func__, tvps->num);
         dev_dbg(fe->dvb->device, "%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 || (tvps->num > DTV_IOCTL_MAX_MSGS))
             return -EINVAL;
 
         tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
         if (IS_ERR(tvp))
             return PTR_ERR(tvp);
 
         for (i = 0; i < tvps->num; i++) {
             err = dtv_property_process_set(fe, file,
                                (tvp + i)->cmd,
                                (tvp + i)->u.data);
             if (err < 0) {
                 kfree(tvp);
                 return err;
             }
         }
         kfree(tvp);
         err = 0;
         break;
     }
     case FE_GET_PROPERTY:
         err = dvb_get_property(fe, file, parg);
         break;
 
     case FE_GET_INFO: {
         struct dvb_frontend_info *info = parg;
         memset(info, 0, sizeof(*info));
 
         strscpy(info->name, fe->ops.info.name, sizeof(info->name));
         info->symbol_rate_min = fe->ops.info.symbol_rate_min;
         info->symbol_rate_max = fe->ops.info.symbol_rate_max;
         info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
         info->caps = fe->ops.info.caps;
         info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
         dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
                           &info->frequency_max,
                           &info->frequency_tolerance);
 
         /*
          * Associate the 4 delivery systems supported by DVBv3
          * API with their DVBv5 counterpart. For the other standards,
          * use the closest type, assuming that it would hopefully
          * work with a DVBv3 application.
          * It should be noticed that, on multi-frontend devices with
          * different types (terrestrial and cable, for example),
          * a pure DVBv3 application won't be able to use all delivery
          * systems. Yet, changing the DVBv5 cache to the other delivery
          * system should be enough for making it work.
          */
         switch (dvbv3_type(c->delivery_system)) {
         case DVBV3_QPSK:
             info->type = FE_QPSK;
             break;
         case DVBV3_ATSC:
             info->type = FE_ATSC;
             break;
         case DVBV3_QAM:
             info->type = FE_QAM;
             break;
         case DVBV3_OFDM:
             info->type = FE_OFDM;
             break;
         default:
             dev_err(fe->dvb->device,
                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
                 __func__, c->delivery_system);
             info->type = FE_OFDM;
         }
         dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
             __func__, c->delivery_system, info->type);
 
         /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
         if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
             info->caps |= FE_CAN_INVERSION_AUTO;
         err = 0;
         break;
     }
 
     case FE_READ_STATUS: {
         enum fe_status *status = parg;
 
         /* if retune was requested but hasn't occurred yet, prevent
          * that user get signal state from previous tuning */
         if (fepriv->state == FESTATE_RETUNE ||
             fepriv->state == FESTATE_ERROR) {
             err = 0;
             *status = 0;
             break;
         }
 
         if (fe->ops.read_status)
             err = fe->ops.read_status(fe, status);
         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) {
             struct dvb_diseqc_master_cmd *cmd = parg;
 
             if (cmd->msg_len > sizeof(cmd->msg)) {
                 err = -EINVAL;
                 break;
             }
             err = fe->ops.diseqc_send_master_cmd(fe, cmd);
             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, (long)parg);
             fepriv->state = FESTATE_DISEQC;
             fepriv->status = 0;
         }
         break;
 
     case FE_SET_TONE:
         if (fe->ops.set_tone) {
             fepriv->tone = (long)parg;
             err = fe->ops.set_tone(fe, fepriv->tone);
             fepriv->state = FESTATE_DISEQC;
             fepriv->status = 0;
         }
         break;
 
     case FE_SET_VOLTAGE:
         if (fe->ops.set_voltage) {
             fepriv->voltage = (long)parg;
             err = fe->ops.set_voltage(fe, fepriv->voltage);
             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, 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_TUNE_MODE:
         fepriv->tune_mode_flags = (unsigned long)parg;
         err = 0;
         break;
     /* DEPRECATED dish control ioctls */
 
     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 should 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 dependent
              * 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;
             ktime_t nexttime;
             ktime_t tv[10];
             int i;
             u8 last = 1;
 
             if (dvb_frontend_debug)
                 dprintk("switch command: 0x%04lx\n",
                     swcmd);
             nexttime = ktime_get_boottime();
             if (dvb_frontend_debug)
                 tv[0] = nexttime;
             /* 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)
                     tv[i + 1] = ktime_get_boottime();
                 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) {
                 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
                     fe->dvb->num);
                 for (i = 1; i < 10; i++)
                     pr_info("%d: %d\n", i,
                         (int)ktime_us_delta(tv[i], tv[i - 1]));
             }
             err = 0;
             fepriv->state = FESTATE_DISEQC;
             fepriv->status = 0;
         }
         break;
 
     /* DEPRECATED statistics ioctls */
 
     case FE_READ_BER:
         if (fe->ops.read_ber) {
             if (fepriv->thread)
                 err = fe->ops.read_ber(fe, parg);
             else
                 err = -EAGAIN;
         }
         break;
 
     case FE_READ_SIGNAL_STRENGTH:
         if (fe->ops.read_signal_strength) {
             if (fepriv->thread)
                 err = fe->ops.read_signal_strength(fe, parg);
             else
                 err = -EAGAIN;
         }
         break;
 
     case FE_READ_SNR:
         if (fe->ops.read_snr) {
             if (fepriv->thread)
                 err = fe->ops.read_snr(fe, parg);
             else
                 err = -EAGAIN;
         }
         break;
 
     case FE_READ_UNCORRECTED_BLOCKS:
         if (fe->ops.read_ucblocks) {
             if (fepriv->thread)
                 err = fe->ops.read_ucblocks(fe, parg);
             else
                 err = -EAGAIN;
         }
         break;
 
     /* DEPRECATED DVBv3 ioctls */
 
     case FE_SET_FRONTEND:
         err = dvbv3_set_delivery_system(fe);
         if (err)
             break;
 
         err = dtv_property_cache_sync(fe, c, parg);
         if (err)
             break;
         err = dtv_set_frontend(fe);
         break;
 
     case FE_GET_EVENT:
         err = dvb_frontend_get_event(fe, parg, file->f_flags);
         break;
 
     case FE_GET_FRONTEND:
         err = dvb_get_frontend(fe, parg);
         break;
 
     default:
         return -ENOTSUPP;
     } /* switch */
 
     return err;
 }
 
 static __poll_t 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;
 
     dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
 
     poll_wait(file, &fepriv->events.wait_queue, wait);
 
     if (fepriv->events.eventw != fepriv->events.eventr)
         return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
 
     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;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
     if (fe->exit == DVB_FE_DEVICE_REMOVED)
         return -ENODEV;
 
     if (adapter->mfe_shared) {
         mutex_lock(&adapter->mfe_lock);
 
         if (!adapter->mfe_dvbdev)
             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)) {
                 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) {
                     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 we took control of the bus, we need to force
            reinitialization.  This is because many ts_bus_ctrl()
            functions strobe the RESET pin on the demod, and if the
            frontend thread already exists then the dvb_init() routine
            won't get called (which is what usually does initial
            register configuration). */
         fepriv->reinitialise = 1;
     }
 
     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;
 
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
         mutex_lock(&fe->dvb->mdev_lock);
         if (fe->dvb->mdev) {
             mutex_lock(&fe->dvb->mdev->graph_mutex);
             if (fe->dvb->mdev->enable_source)
                 ret = fe->dvb->mdev->enable_source(
                                dvbdev->entity,
                                &fepriv->pipe);
             mutex_unlock(&fe->dvb->mdev->graph_mutex);
             if (ret) {
                 mutex_unlock(&fe->dvb->mdev_lock);
                 dev_err(fe->dvb->device,
                     "Tuner is busy. Error %d\n", ret);
                 goto err2;
             }
         }
         mutex_unlock(&fe->dvb->mdev_lock);
 #endif
         ret = dvb_frontend_start(fe);
         if (ret)
             goto err3;
 
         /*  empty event queue */
         fepriv->events.eventr = fepriv->events.eventw = 0;
     }
 
     dvb_frontend_get(fe);
 
     if (adapter->mfe_shared)
         mutex_unlock(&adapter->mfe_lock);
     return ret;
 
 err3:
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
     mutex_lock(&fe->dvb->mdev_lock);
     if (fe->dvb->mdev) {
         mutex_lock(&fe->dvb->mdev->graph_mutex);
         if (fe->dvb->mdev->disable_source)
             fe->dvb->mdev->disable_source(dvbdev->entity);
         mutex_unlock(&fe->dvb->mdev->graph_mutex);
     }
     mutex_unlock(&fe->dvb->mdev_lock);
 err2:
 #endif
     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;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
     if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
         fepriv->release_jiffies = jiffies;
         mb();
     }
 
     ret = dvb_generic_release(inode, file);
 
     if (dvbdev->users == -1) {
         wake_up(&fepriv->wait_queue);
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
         mutex_lock(&fe->dvb->mdev_lock);
         if (fe->dvb->mdev) {
             mutex_lock(&fe->dvb->mdev->graph_mutex);
             if (fe->dvb->mdev->disable_source)
                 fe->dvb->mdev->disable_source(dvbdev->entity);
             mutex_unlock(&fe->dvb->mdev->graph_mutex);
         }
         mutex_unlock(&fe->dvb->mdev_lock);
 #endif
         if (fe->exit != DVB_FE_NO_EXIT)
             wake_up(&dvbdev->wait_queue);
         if (fe->ops.ts_bus_ctrl)
             fe->ops.ts_bus_ctrl(fe, 0);
     }
 
     dvb_frontend_put(fe);
 
     return ret;
 }
 
 static const struct file_operations dvb_frontend_fops = {
     .owner      = THIS_MODULE,
     .unlocked_ioctl = dvb_frontend_ioctl,
 #ifdef CONFIG_COMPAT
     .compat_ioctl   = dvb_frontend_compat_ioctl,
 #endif
     .poll       = dvb_frontend_poll,
     .open       = dvb_frontend_open,
     .release    = dvb_frontend_release,
     .llseek     = noop_llseek,
 };
 
 int dvb_frontend_suspend(struct dvb_frontend *fe)
 {
     int ret = 0;
 
     dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
         fe->id);
 
     if (fe->ops.tuner_ops.suspend)
         ret = fe->ops.tuner_ops.suspend(fe);
     else if (fe->ops.tuner_ops.sleep)
         ret = fe->ops.tuner_ops.sleep(fe);
 
     if (fe->ops.suspend)
         ret = fe->ops.suspend(fe);
     else if (fe->ops.sleep)
         ret = fe->ops.sleep(fe);
 
     return ret;
 }
 EXPORT_SYMBOL(dvb_frontend_suspend);
 
 int dvb_frontend_resume(struct dvb_frontend *fe)
 {
     struct dvb_frontend_private *fepriv = fe->frontend_priv;
     int ret = 0;
 
     dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
         fe->id);
 
     fe->exit = DVB_FE_DEVICE_RESUME;
     if (fe->ops.resume)
         ret = fe->ops.resume(fe);
     else if (fe->ops.init)
         ret = fe->ops.init(fe);
 
     if (fe->ops.tuner_ops.resume)
         ret = fe->ops.tuner_ops.resume(fe);
     else if (fe->ops.tuner_ops.init)
         ret = fe->ops.tuner_ops.init(fe);
 
     if (fe->ops.set_tone && fepriv->tone != -1)
         fe->ops.set_tone(fe, fepriv->tone);
     if (fe->ops.set_voltage && fepriv->voltage != -1)
         fe->ops.set_voltage(fe, fepriv->voltage);
 
     fe->exit = DVB_FE_NO_EXIT;
     fepriv->state = FESTATE_RETUNE;
     dvb_frontend_wakeup(fe);
 
     return ret;
 }
 EXPORT_SYMBOL(dvb_frontend_resume);
 
 int dvb_register_frontend(struct dvb_adapter *dvb,
               struct dvb_frontend *fe)
 {
     struct dvb_frontend_private *fepriv;
     const struct dvb_device dvbdev_template = {
         .users = ~0,
         .writers = 1,
         .readers = (~0) - 1,
         .fops = &dvb_frontend_fops,
 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
         .name = fe->ops.info.name,
 #endif
     };
 
     dev_dbg(dvb->device, "%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) {
         mutex_unlock(&frontend_mutex);
         return -ENOMEM;
     }
     fepriv = fe->frontend_priv;
 
     kref_init(&fe->refcount);
 
     /*
      * After initialization, there need to be two references: one
      * for dvb_unregister_frontend(), and another one for
      * dvb_frontend_detach().
      */
     dvb_frontend_get(fe);
 
     sema_init(&fepriv->sem, 1);
     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;
 
     dev_info(fe->dvb->device,
          "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, 0);
 
     /*
      * Initialize the cache to the proper values according with the
      * first supported delivery system (ops->delsys[0])
      */
 
     fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
     dvb_frontend_clear_cache(fe);
 
     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;
 
     dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
     mutex_lock(&frontend_mutex);
     dvb_frontend_stop(fe);
     dvb_remove_device(fepriv->dvbdev);
 
     /* fe is invalid now */
     mutex_unlock(&frontend_mutex);
     dvb_frontend_put(fe);
     return 0;
 }
 EXPORT_SYMBOL(dvb_unregister_frontend);
 
 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
                     void (*release)(struct dvb_frontend *fe))
 {
     if (release) {
         release(fe);
 #ifdef CONFIG_MEDIA_ATTACH
         dvb_detach(release);
 #endif
     }
 }
 
 void dvb_frontend_detach(struct dvb_frontend *fe)
 {
     dvb_frontend_invoke_release(fe, fe->ops.release_sec);
     dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
     dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
     dvb_frontend_put(fe);
 }
 EXPORT_SYMBOL(dvb_frontend_detach);