drivers/media/usb/dvb-usb/dvb-usb-dvb.c - codeaurora/cp-linux - Gitiles

 /* dvb-usb-dvb.c is part of the DVB USB library.
  *
  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
  * see dvb-usb-init.c for copyright information.
  *
  * This file contains functions for initializing and handling the
  * linux-dvb API.
  */
 #include "dvb-usb-common.h"

 /* does the complete input transfer handling */
 static int dvb_usb_ctrl_feed(struct dvb_demux_feed *dvbdmxfeed, int onoff)
 {
 	struct dvb_usb_adapter *adap = dvbdmxfeed->demux->priv;
 	int newfeedcount, ret;

 	if (adap == NULL)
 		return -ENODEV;

 	if ((adap->active_fe < 0) ||
 	    (adap->active_fe >= adap->num_frontends_initialized)) {
 		return -EINVAL;
 	}

 	newfeedcount = adap->feedcount + (onoff ? 1 : -1);

 	/* stop feed before setting a new pid if there will be no pid anymore */
 	if (newfeedcount == 0) {
 		deb_ts("stop feeding\n");
 		usb_urb_kill(&adap->fe_adap[adap->active_fe].stream);

 		if (adap->props.fe[adap->active_fe].streaming_ctrl != NULL) {
 			ret = adap->props.fe[adap->active_fe].streaming_ctrl(adap, 0);
 			if (ret < 0) {
 				err("error while stopping stream.");
 				return ret;
 			}
 		}
 	}

 	adap->feedcount = newfeedcount;

 	/* activate the pid on the device specific pid_filter */
 	deb_ts("setting pid (%s): %5d %04x at index %d '%s'\n",
 		adap->fe_adap[adap->active_fe].pid_filtering ?
 		"yes" : "no", dvbdmxfeed->pid, dvbdmxfeed->pid,
 		dvbdmxfeed->index, onoff ? "on" : "off");
 	if (adap->props.fe[adap->active_fe].caps & DVB_USB_ADAP_HAS_PID_FILTER &&
 		adap->fe_adap[adap->active_fe].pid_filtering &&
 		adap->props.fe[adap->active_fe].pid_filter != NULL)
 		adap->props.fe[adap->active_fe].pid_filter(adap, dvbdmxfeed->index, dvbdmxfeed->pid, onoff);

 	/* start the feed if this was the first feed and there is still a feed
 	 * for reception.
 	 */
 	if (adap->feedcount == onoff && adap->feedcount > 0) {
 		deb_ts("submitting all URBs\n");
 		usb_urb_submit(&adap->fe_adap[adap->active_fe].stream);

 		deb_ts("controlling pid parser\n");
 		if (adap->props.fe[adap->active_fe].caps & DVB_USB_ADAP_HAS_PID_FILTER &&
 			adap->props.fe[adap->active_fe].caps &
 			DVB_USB_ADAP_PID_FILTER_CAN_BE_TURNED_OFF &&
 			adap->props.fe[adap->active_fe].pid_filter_ctrl != NULL) {
 			ret = adap->props.fe[adap->active_fe].pid_filter_ctrl(adap,
 				adap->fe_adap[adap->active_fe].pid_filtering);
 			if (ret < 0) {
 				err("could not handle pid_parser");
 				return ret;
 			}
 		}
 		deb_ts("start feeding\n");
 		if (adap->props.fe[adap->active_fe].streaming_ctrl != NULL) {
 			ret = adap->props.fe[adap->active_fe].streaming_ctrl(adap, 1);
 			if (ret < 0) {
 				err("error while enabling fifo.");
 				return ret;
 			}
 		}

 	}
 	return 0;
 }

 static int dvb_usb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
 {
 	deb_ts("start pid: 0x%04x, feedtype: %d\n", dvbdmxfeed->pid,
 	       dvbdmxfeed->type);
 	return dvb_usb_ctrl_feed(dvbdmxfeed, 1);
 }

 static int dvb_usb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 {
 	deb_ts("stop pid: 0x%04x, feedtype: %d\n", dvbdmxfeed->pid, dvbdmxfeed->type);
 	return dvb_usb_ctrl_feed(dvbdmxfeed, 0);
 }

 static void dvb_usb_media_device_register(struct dvb_usb_adapter *adap)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 	struct media_device *mdev;
 	struct dvb_usb_device *d = adap->dev;
 	struct usb_device *udev = d->udev;
 	int ret;

 	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
 	if (!mdev)
 		return;

 	mdev->dev = &udev->dev;
 	strlcpy(mdev->model, d->desc->name, sizeof(mdev->model));
 	if (udev->serial)
 		strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
 	strcpy(mdev->bus_info, udev->devpath);
 	mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
 	mdev->driver_version = LINUX_VERSION_CODE;

 	ret = media_device_register(mdev);
 	if (ret) {
 		dev_err(&d->udev->dev,
 			"Couldn't create a media device. Error: %d\n",
 			ret);
 		kfree(mdev);
 		return;
 	}
 	dvb_register_media_controller(&adap->dvb_adap, mdev);

 	dev_info(&d->udev->dev, "media controller created\n");
 #endif
 }

 static void dvb_usb_media_device_unregister(struct dvb_usb_adapter *adap)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 	if (!adap->dvb_adap.mdev)
 		return;

 	media_device_unregister(adap->dvb_adap.mdev);
 	kfree(adap->dvb_adap.mdev);
 	adap->dvb_adap.mdev = NULL;
 #endif
 }

 int dvb_usb_adapter_dvb_init(struct dvb_usb_adapter *adap, short *adapter_nums)
 {
 	int i;
 	int ret = dvb_register_adapter(&adap->dvb_adap, adap->dev->desc->name,
 				       adap->dev->owner, &adap->dev->udev->dev,
 				       adapter_nums);

 	if (ret < 0) {
 		deb_info("dvb_register_adapter failed: error %d", ret);
 		goto err;
 	}
 	adap->dvb_adap.priv = adap;

 	dvb_usb_media_device_register(adap);

 	if (adap->dev->props.read_mac_address) {
 		if (adap->dev->props.read_mac_address(adap->dev, adap->dvb_adap.proposed_mac) == 0)
 			info("MAC address: %pM", adap->dvb_adap.proposed_mac);
 		else
 			err("MAC address reading failed.");
 	}


 	adap->demux.dmx.capabilities = DMX_TS_FILTERING | DMX_SECTION_FILTERING;
 	adap->demux.priv             = adap;

 	adap->demux.filternum        = 0;
 	for (i = 0; i < adap->props.num_frontends; i++) {
 		if (adap->demux.filternum < adap->fe_adap[i].max_feed_count)
 			adap->demux.filternum = adap->fe_adap[i].max_feed_count;
 	}
 	adap->demux.feednum          = adap->demux.filternum;
 	adap->demux.start_feed       = dvb_usb_start_feed;
 	adap->demux.stop_feed        = dvb_usb_stop_feed;
 	adap->demux.write_to_decoder = NULL;
 	if ((ret = dvb_dmx_init(&adap->demux)) < 0) {
 		err("dvb_dmx_init failed: error %d", ret);
 		goto err_dmx;
 	}

 	adap->dmxdev.filternum       = adap->demux.filternum;
 	adap->dmxdev.demux           = &adap->demux.dmx;
 	adap->dmxdev.capabilities    = 0;
 	if ((ret = dvb_dmxdev_init(&adap->dmxdev, &adap->dvb_adap)) < 0) {
 		err("dvb_dmxdev_init failed: error %d", ret);
 		goto err_dmx_dev;
 	}

 	if ((ret = dvb_net_init(&adap->dvb_adap, &adap->dvb_net,
 						&adap->demux.dmx)) < 0) {
 		err("dvb_net_init failed: error %d", ret);
 		goto err_net_init;
 	}

 	adap->state |= DVB_USB_ADAP_STATE_DVB;
 	return 0;

 err_net_init:
 	dvb_dmxdev_release(&adap->dmxdev);
 err_dmx_dev:
 	dvb_dmx_release(&adap->demux);
 err_dmx:
 	dvb_usb_media_device_unregister(adap);
 	dvb_unregister_adapter(&adap->dvb_adap);
 err:
 	return ret;
 }

 int dvb_usb_adapter_dvb_exit(struct dvb_usb_adapter *adap)
 {
 	if (adap->state & DVB_USB_ADAP_STATE_DVB) {
 		deb_info("unregistering DVB part\n");
 		dvb_net_release(&adap->dvb_net);
 		adap->demux.dmx.close(&adap->demux.dmx);
 		dvb_dmxdev_release(&adap->dmxdev);
 		dvb_dmx_release(&adap->demux);
 		dvb_usb_media_device_unregister(adap);
 		dvb_unregister_adapter(&adap->dvb_adap);
 		adap->state &= ~DVB_USB_ADAP_STATE_DVB;
 	}
 	return 0;
 }

 static int dvb_usb_set_active_fe(struct dvb_frontend *fe, int onoff)
 {
 	struct dvb_usb_adapter *adap = fe->dvb->priv;

 	int ret = (adap->props.frontend_ctrl) ?
 		adap->props.frontend_ctrl(fe, onoff) : 0;

 	if (ret < 0) {
 		err("frontend_ctrl request failed");
 		return ret;
 	}
 	if (onoff)
 		adap->active_fe = fe->id;

 	return 0;
 }

 static int dvb_usb_fe_wakeup(struct dvb_frontend *fe)
 {
 	struct dvb_usb_adapter *adap = fe->dvb->priv;

 	dvb_usb_device_power_ctrl(adap->dev, 1);

 	dvb_usb_set_active_fe(fe, 1);

 	if (adap->fe_adap[fe->id].fe_init)
 		adap->fe_adap[fe->id].fe_init(fe);

 	return 0;
 }

 static int dvb_usb_fe_sleep(struct dvb_frontend *fe)
 {
 	struct dvb_usb_adapter *adap = fe->dvb->priv;

 	if (adap->fe_adap[fe->id].fe_sleep)
 		adap->fe_adap[fe->id].fe_sleep(fe);

 	dvb_usb_set_active_fe(fe, 0);

 	return dvb_usb_device_power_ctrl(adap->dev, 0);
 }

 int dvb_usb_adapter_frontend_init(struct dvb_usb_adapter *adap)
 {
 	int ret, i;

 	/* register all given adapter frontends */
 	for (i = 0; i < adap->props.num_frontends; i++) {

 		if (adap->props.fe[i].frontend_attach == NULL) {
 			err("strange: '%s' #%d,%d "
 			    "doesn't want to attach a frontend.",
 			    adap->dev->desc->name, adap->id, i);

 			return 0;
 		}

 		ret = adap->props.fe[i].frontend_attach(adap);
 		if (ret || adap->fe_adap[i].fe == NULL) {
 			/* only print error when there is no FE at all */
 			if (i == 0)
 				err("no frontend was attached by '%s'",
 					adap->dev->desc->name);

 			return 0;
 		}

 		adap->fe_adap[i].fe->id = i;

 		/* re-assign sleep and wakeup functions */
 		adap->fe_adap[i].fe_init = adap->fe_adap[i].fe->ops.init;
 		adap->fe_adap[i].fe->ops.init  = dvb_usb_fe_wakeup;
 		adap->fe_adap[i].fe_sleep = adap->fe_adap[i].fe->ops.sleep;
 		adap->fe_adap[i].fe->ops.sleep = dvb_usb_fe_sleep;

 		if (dvb_register_frontend(&adap->dvb_adap, adap->fe_adap[i].fe)) {
 			err("Frontend %d registration failed.", i);
 			dvb_frontend_detach(adap->fe_adap[i].fe);
 			adap->fe_adap[i].fe = NULL;
 			/* In error case, do not try register more FEs,
 			 * still leaving already registered FEs alive. */
 			if (i == 0)
 				return -ENODEV;
 			else
 				return 0;
 		}

 		/* only attach the tuner if the demod is there */
 		if (adap->props.fe[i].tuner_attach != NULL)
 			adap->props.fe[i].tuner_attach(adap);

 		adap->num_frontends_initialized++;
 	}

 	dvb_create_media_graph(&adap->dvb_adap);

 	return 0;
 }

 int dvb_usb_adapter_frontend_exit(struct dvb_usb_adapter *adap)
 {
 	int i = adap->num_frontends_initialized - 1;

 	/* unregister all given adapter frontends */
 	for (; i >= 0; i--) {
 		if (adap->fe_adap[i].fe != NULL) {
 			dvb_unregister_frontend(adap->fe_adap[i].fe);
 			dvb_frontend_detach(adap->fe_adap[i].fe);
 		}
 	}
 	adap->num_frontends_initialized = 0;

 	return 0;
 }
	/* dvb-usb-dvb.c is part of the DVB USB library.
	*
	* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
	* see dvb-usb-init.c for copyright information.
	*
	* This file contains functions for initializing and handling the
	* linux-dvb API.
	*/
	#include "dvb-usb-common.h"

	/* does the complete input transfer handling */
	static int dvb_usb_ctrl_feed(struct dvb_demux_feed *dvbdmxfeed, int onoff)
	{
	struct dvb_usb_adapter *adap = dvbdmxfeed->demux->priv;
	int newfeedcount, ret;

	if (adap == NULL)
	return -ENODEV;

	if ((adap->active_fe < 0) \|\|
	(adap->active_fe >= adap->num_frontends_initialized)) {
	return -EINVAL;
	}

	newfeedcount = adap->feedcount + (onoff ? 1 : -1);

	/* stop feed before setting a new pid if there will be no pid anymore */
	if (newfeedcount == 0) {
	deb_ts("stop feeding\n");
	usb_urb_kill(&adap->fe_adap[adap->active_fe].stream);

	if (adap->props.fe[adap->active_fe].streaming_ctrl != NULL) {
	ret = adap->props.fe[adap->active_fe].streaming_ctrl(adap, 0);
	if (ret < 0) {
	err("error while stopping stream.");
	return ret;
	}
	}
	}

	adap->feedcount = newfeedcount;

	/* activate the pid on the device specific pid_filter */
	deb_ts("setting pid (%s): %5d %04x at index %d '%s'\n",
	adap->fe_adap[adap->active_fe].pid_filtering ?
	"yes" : "no", dvbdmxfeed->pid, dvbdmxfeed->pid,
	dvbdmxfeed->index, onoff ? "on" : "off");
	if (adap->props.fe[adap->active_fe].caps & DVB_USB_ADAP_HAS_PID_FILTER &&
	adap->fe_adap[adap->active_fe].pid_filtering &&
	adap->props.fe[adap->active_fe].pid_filter != NULL)
	adap->props.fe[adap->active_fe].pid_filter(adap, dvbdmxfeed->index, dvbdmxfeed->pid, onoff);

	/* start the feed if this was the first feed and there is still a feed
	* for reception.
	*/
	if (adap->feedcount == onoff && adap->feedcount > 0) {
	deb_ts("submitting all URBs\n");
	usb_urb_submit(&adap->fe_adap[adap->active_fe].stream);

	deb_ts("controlling pid parser\n");
	if (adap->props.fe[adap->active_fe].caps & DVB_USB_ADAP_HAS_PID_FILTER &&
	adap->props.fe[adap->active_fe].caps &
	DVB_USB_ADAP_PID_FILTER_CAN_BE_TURNED_OFF &&
	adap->props.fe[adap->active_fe].pid_filter_ctrl != NULL) {
	ret = adap->props.fe[adap->active_fe].pid_filter_ctrl(adap,
	adap->fe_adap[adap->active_fe].pid_filtering);
	if (ret < 0) {
	err("could not handle pid_parser");
	return ret;
	}
	}
	deb_ts("start feeding\n");
	if (adap->props.fe[adap->active_fe].streaming_ctrl != NULL) {
	ret = adap->props.fe[adap->active_fe].streaming_ctrl(adap, 1);
	if (ret < 0) {
	err("error while enabling fifo.");
	return ret;
	}
	}

	}
	return 0;
	}

	static int dvb_usb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
	{
	deb_ts("start pid: 0x%04x, feedtype: %d\n", dvbdmxfeed->pid,
	dvbdmxfeed->type);
	return dvb_usb_ctrl_feed(dvbdmxfeed, 1);
	}

	static int dvb_usb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
	{
	deb_ts("stop pid: 0x%04x, feedtype: %d\n", dvbdmxfeed->pid, dvbdmxfeed->type);
	return dvb_usb_ctrl_feed(dvbdmxfeed, 0);
	}

	static void dvb_usb_media_device_register(struct dvb_usb_adapter *adap)
	{
	#ifdef CONFIG_MEDIA_CONTROLLER_DVB
	struct media_device *mdev;
	struct dvb_usb_device *d = adap->dev;
	struct usb_device *udev = d->udev;
	int ret;

	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
	if (!mdev)
	return;

	mdev->dev = &udev->dev;
	strlcpy(mdev->model, d->desc->name, sizeof(mdev->model));
	if (udev->serial)
	strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
	strcpy(mdev->bus_info, udev->devpath);
	mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
	mdev->driver_version = LINUX_VERSION_CODE;

	ret = media_device_register(mdev);
	if (ret) {
	dev_err(&d->udev->dev,
	"Couldn't create a media device. Error: %d\n",
	ret);
	kfree(mdev);
	return;
	}
	dvb_register_media_controller(&adap->dvb_adap, mdev);

	dev_info(&d->udev->dev, "media controller created\n");
	#endif
	}

	static void dvb_usb_media_device_unregister(struct dvb_usb_adapter *adap)
	{
	#ifdef CONFIG_MEDIA_CONTROLLER_DVB
	if (!adap->dvb_adap.mdev)
	return;

	media_device_unregister(adap->dvb_adap.mdev);
	kfree(adap->dvb_adap.mdev);
	adap->dvb_adap.mdev = NULL;
	#endif
	}

	int dvb_usb_adapter_dvb_init(struct dvb_usb_adapter adap, short adapter_nums)
	{
	int i;
	int ret = dvb_register_adapter(&adap->dvb_adap, adap->dev->desc->name,
	adap->dev->owner, &adap->dev->udev->dev,
	adapter_nums);

	if (ret < 0) {
	deb_info("dvb_register_adapter failed: error %d", ret);
	goto err;
	}
	adap->dvb_adap.priv = adap;

	dvb_usb_media_device_register(adap);

	if (adap->dev->props.read_mac_address) {
	if (adap->dev->props.read_mac_address(adap->dev, adap->dvb_adap.proposed_mac) == 0)
	info("MAC address: %pM", adap->dvb_adap.proposed_mac);
	else
	err("MAC address reading failed.");
	}


	adap->demux.dmx.capabilities = DMX_TS_FILTERING \| DMX_SECTION_FILTERING;
	adap->demux.priv = adap;

	adap->demux.filternum = 0;
	for (i = 0; i < adap->props.num_frontends; i++) {
	if (adap->demux.filternum < adap->fe_adap[i].max_feed_count)
	adap->demux.filternum = adap->fe_adap[i].max_feed_count;
	}
	adap->demux.feednum = adap->demux.filternum;
	adap->demux.start_feed = dvb_usb_start_feed;
	adap->demux.stop_feed = dvb_usb_stop_feed;
	adap->demux.write_to_decoder = NULL;
	if ((ret = dvb_dmx_init(&adap->demux)) < 0) {
	err("dvb_dmx_init failed: error %d", ret);
	goto err_dmx;
	}

	adap->dmxdev.filternum = adap->demux.filternum;
	adap->dmxdev.demux = &adap->demux.dmx;
	adap->dmxdev.capabilities = 0;
	if ((ret = dvb_dmxdev_init(&adap->dmxdev, &adap->dvb_adap)) < 0) {
	err("dvb_dmxdev_init failed: error %d", ret);
	goto err_dmx_dev;
	}

	if ((ret = dvb_net_init(&adap->dvb_adap, &adap->dvb_net,
	&adap->demux.dmx)) < 0) {
	err("dvb_net_init failed: error %d", ret);
	goto err_net_init;
	}

	adap->state \|= DVB_USB_ADAP_STATE_DVB;
	return 0;

	err_net_init:
	dvb_dmxdev_release(&adap->dmxdev);
	err_dmx_dev:
	dvb_dmx_release(&adap->demux);
	err_dmx:
	dvb_usb_media_device_unregister(adap);
	dvb_unregister_adapter(&adap->dvb_adap);
	err:
	return ret;
	}

	int dvb_usb_adapter_dvb_exit(struct dvb_usb_adapter *adap)
	{
	if (adap->state & DVB_USB_ADAP_STATE_DVB) {
	deb_info("unregistering DVB part\n");
	dvb_net_release(&adap->dvb_net);
	adap->demux.dmx.close(&adap->demux.dmx);
	dvb_dmxdev_release(&adap->dmxdev);
	dvb_dmx_release(&adap->demux);
	dvb_usb_media_device_unregister(adap);
	dvb_unregister_adapter(&adap->dvb_adap);
	adap->state &= ~DVB_USB_ADAP_STATE_DVB;
	}
	return 0;
	}

	static int dvb_usb_set_active_fe(struct dvb_frontend *fe, int onoff)
	{
	struct dvb_usb_adapter *adap = fe->dvb->priv;

	int ret = (adap->props.frontend_ctrl) ?
	adap->props.frontend_ctrl(fe, onoff) : 0;

	if (ret < 0) {
	err("frontend_ctrl request failed");
	return ret;
	}
	if (onoff)
	adap->active_fe = fe->id;

	return 0;
	}

	static int dvb_usb_fe_wakeup(struct dvb_frontend *fe)
	{
	struct dvb_usb_adapter *adap = fe->dvb->priv;

	dvb_usb_device_power_ctrl(adap->dev, 1);

	dvb_usb_set_active_fe(fe, 1);

	if (adap->fe_adap[fe->id].fe_init)
	adap->fe_adap[fe->id].fe_init(fe);

	return 0;
	}

	static int dvb_usb_fe_sleep(struct dvb_frontend *fe)
	{
	struct dvb_usb_adapter *adap = fe->dvb->priv;

	if (adap->fe_adap[fe->id].fe_sleep)
	adap->fe_adap[fe->id].fe_sleep(fe);

	dvb_usb_set_active_fe(fe, 0);

	return dvb_usb_device_power_ctrl(adap->dev, 0);
	}

	int dvb_usb_adapter_frontend_init(struct dvb_usb_adapter *adap)
	{
	int ret, i;

	/* register all given adapter frontends */
	for (i = 0; i < adap->props.num_frontends; i++) {

	if (adap->props.fe[i].frontend_attach == NULL) {
	err("strange: '%s' #%d,%d "
	"doesn't want to attach a frontend.",
	adap->dev->desc->name, adap->id, i);

	return 0;
	}

	ret = adap->props.fe[i].frontend_attach(adap);
	if (ret \|\| adap->fe_adap[i].fe == NULL) {
	/* only print error when there is no FE at all */
	if (i == 0)
	err("no frontend was attached by '%s'",
	adap->dev->desc->name);

	return 0;
	}

	adap->fe_adap[i].fe->id = i;

	/* re-assign sleep and wakeup functions */
	adap->fe_adap[i].fe_init = adap->fe_adap[i].fe->ops.init;
	adap->fe_adap[i].fe->ops.init = dvb_usb_fe_wakeup;
	adap->fe_adap[i].fe_sleep = adap->fe_adap[i].fe->ops.sleep;
	adap->fe_adap[i].fe->ops.sleep = dvb_usb_fe_sleep;

	if (dvb_register_frontend(&adap->dvb_adap, adap->fe_adap[i].fe)) {
	err("Frontend %d registration failed.", i);
	dvb_frontend_detach(adap->fe_adap[i].fe);
	adap->fe_adap[i].fe = NULL;
	/* In error case, do not try register more FEs,
	* still leaving already registered FEs alive. */
	if (i == 0)
	return -ENODEV;
	else
	return 0;
	}

	/* only attach the tuner if the demod is there */
	if (adap->props.fe[i].tuner_attach != NULL)
	adap->props.fe[i].tuner_attach(adap);

	adap->num_frontends_initialized++;
	}

	dvb_create_media_graph(&adap->dvb_adap);

	return 0;
	}

	int dvb_usb_adapter_frontend_exit(struct dvb_usb_adapter *adap)
	{
	int i = adap->num_frontends_initialized - 1;

	/* unregister all given adapter frontends */
	for (; i >= 0; i--) {
	if (adap->fe_adap[i].fe != NULL) {
	dvb_unregister_frontend(adap->fe_adap[i].fe);
	dvb_frontend_detach(adap->fe_adap[i].fe);
	}
	}
	adap->num_frontends_initialized = 0;

	return 0;
	}