Commit message: media: dvb_frontend: fix ifnullfree.cocci warnings

drivers/media/dvb-core/dvb_frontend.c:154:2-7: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

Generated by: scripts/coccinelle/free/ifnullfree.cocci

Fixes: b1cb7372fa82 ("dvb_frontend: don't use-after-free the frontend struct")

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
CVE: CVE-2017-16648
CWE: CWE-416
Vulnerability description: The dvb_frontend_free function in drivers/media/dvb-core/dvb_frontend.c in the Linux kernel through 4.13.11 allows local users to cause a denial of service (use-after-free and system crash) or possibly have unspecified other impact via a crafted USB device. NOTE: the function was later renamed __dvb_frontend_free.

Project: linux
File: dvb_frontend.c

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 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 retuned, enter the ZIGZAG_FAST state.
		 * This ensures we cannot return from an
		 * FE_SET_FRONTEND ioctl before the first frontend tune
		 * occurs */
		if (fepriv->state & FESTATE_RETUNE) {
			fepriv->state = FESTATE_TUNING_FAST;
		}
	}

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

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

Project: linux
File: dvb_frontend.c

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(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: {
		struct dtv_properties *tvps = parg;
		struct dtv_property *tvp = NULL;
		struct dtv_frontend_properties getp = fe->dtv_property_cache;

		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(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,
						       tvp + i, file);
			if (err < 0) {
				kfree(tvp);
				return err;
			}
		}

		if (copy_to_user((void __user *)tvps->props, tvp,
				 tvps->num * sizeof(struct dtv_property))) {
			kfree(tvp);
			return -EFAULT;
		}
		kfree(tvp);
		err = 0;
		break;
	}

	case FE_GET_INFO: {
		struct dvb_frontend_info* info = parg;

		memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
		dvb_frontend_get_frequency_limits(fe, &info->frequency_min, &info->frequency_max);

		/*
		 * 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);
			fe->ops.info.type = FE_OFDM;
		}
		dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
				 __func__, c->delivery_system, fe->ops.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,
						(enum fe_sec_mini_cmd)parg);
			fepriv->state = FESTATE_DISEQC;
			fepriv->status = 0;
		}
		break;

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

	case FE_SET_VOLTAGE:
		if (fe->ops.set_voltage) {
			err = fe->ops.set_voltage(fe,
						  (enum fe_sec_voltage)parg);
			fepriv->voltage = (enum fe_sec_voltage)parg;
			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("%s switch command: 0x%04lx\n",
					__func__, 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("%s(%d): switch delay (should be 32k followed by all 8k)\n",
					__func__, 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: {
		struct dtv_frontend_properties getp = fe->dtv_property_cache;

		/*
		 * 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.
		 */
		err = dtv_get_frontend(fe, &getp, parg);
		break;
	}

	default:
		return -ENOTSUPP;
	} /* switch */

	return err;
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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 == NULL)
			adapter->mfe_dvbdev = dvbdev;

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

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

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

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

		/* If 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
		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) {
				dev_err(fe->dvb->device,
					"Tuner is busy. Error %d\n", ret);
				goto err2;
			}
		}
#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
	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);
	}
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;
}

Project: linux
File: dvb_frontend.c

static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
					u32 *freq_min, u32 *freq_max)
{
	*freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);

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

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

Project: linux
File: dvb_frontend.c

static int dvb_frontend_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;
}

Project: linux
File: dvb_frontend.c

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.sleep)
		ret = fe->ops.sleep(fe);

	return ret;
}

Project: linux
File: dvb_frontend.c

static bool is_dvbv3_delsys(u32 delsys)
{
	return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
	       (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
}

Project: linux
File: dvb_frontend.c

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 = 0;
	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;

	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;
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

static void dvb_frontend_put(struct dvb_frontend *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);
}

Project: linux
File: dvb_frontend.c

static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dvb_frontend *fe = dvbdev->priv;
	struct dvb_frontend_private *fepriv = fe->frontend_priv;

	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 (POLLIN | POLLRDNORM | POLLPRI);

	return 0;
}

Project: linux
File: dvb_frontend.c

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
		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);
		}
#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;
}

Project: linux
File: dvb_frontend.c

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.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;
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

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;
	struct dvb_frontend_tune_settings fetunesettings;
	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;

	/* get frontend-specific tuning settings */
	memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_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 = fe->ops.info.frequency_stepsize * 2;
			fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 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;

	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;
}

Project: linux
File: dvb_frontend.c

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
	}
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

static void dvb_frontend_get(struct dvb_frontend *fe)
{
	kref_get(&fe->refcount);
}

Project: linux
File: dvb_frontend.c

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);
	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;
		}
	default:
		break;
	}

	return 0;
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

static void dvb_frontend_free(struct kref *ref)
{
	struct dvb_frontend *fe =
		container_of(ref, struct dvb_frontend, refcount);

	__dvb_frontend_free(fe);
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

static bool has_get_frontend(struct dvb_frontend *fe)
{
	return fe->ops.get_frontend != NULL;
}

Project: linux
File: dvb_frontend.c

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
		.kernel_ioctl = dvb_frontend_ioctl
	};

	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 == NULL) {
		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;
}

Project: linux
File: dvb_frontend.c

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);
	}
}

Project: linux
File: dvb_frontend.c

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;

		up(&fepriv->sem);

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

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

		if (ret < 0)
			return ret;
	}

	mutex_lock(&events->mtx);
	*event = events->events[events->eventr];
	events->eventr = (events->eventr + 1) % MAX_EVENT;
	mutex_unlock(&events->mtx);

	return 0;
}

Project: linux
File: dvb_frontend.c

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;

	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;
		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;

	/* 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;
		break;
	case DTV_STAT_CNR:
		tvp->u.st = c->cnr;
		break;
	case DTV_STAT_PRE_ERROR_BIT_COUNT:
		tvp->u.st = c->pre_bit_error;
		break;
	case DTV_STAT_PRE_TOTAL_BIT_COUNT:
		tvp->u.st = c->pre_bit_count;
		break;
	case DTV_STAT_POST_ERROR_BIT_COUNT:
		tvp->u.st = c->post_bit_error;
		break;
	case DTV_STAT_POST_TOTAL_BIT_COUNT:
		tvp->u.st = c->post_bit_count;
		break;
	case DTV_STAT_ERROR_BLOCK_COUNT:
		tvp->u.st = c->block_error;
		break;
	case DTV_STAT_TOTAL_BLOCK_COUNT:
		tvp->u.st = c->block_count;
		break;
	default:
		dev_dbg(fe->dvb->device,
			"%s: FE property %d doesn't exist\n",
			__func__, tvp->cmd);
		return -EINVAL;
	}

	if (!dtv_cmds[tvp->cmd].buffer)
		dev_dbg(fe->dvb->device,
			"%s: GET cmd 0x%08x (%s) = 0x%08x\n",
			__func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
			tvp->u.data);
	else
		dev_dbg(fe->dvb->device,
			"%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
			__func__,
			tvp->cmd, dtv_cmds[tvp->cmd].name,
			tvp->u.buffer.len,
			tvp->u.buffer.len, tvp->u.buffer.data);

	return 0;
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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_cmds[cmd].name, 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;

	/* 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;
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

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_invoke_release(fe, fe->ops.detach);
	dvb_frontend_put(fe);
}

Project: linux
File: dvb_frontend.c

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;
	}
}

Project: linux
File: dvb_frontend.c

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;
}

Project: linux
File: dvb_frontend.c

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);
}

Project: linux
File: dvb_frontend.c

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

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