linux_kernel/drivers/media/usb/dvb-usb/dvb-usb-dvb.c

// SPDX-License-Identifier: GPL-2.0
/* dvb-usb-dvb.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.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"
#include <media/media-device.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 int dvb_usb_media_device_init(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;

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

	media_device_usb_init(mdev, udev, d->desc->name);

	dvb_register_media_controller(&adap->dvb_adap, mdev);

	dev_info(&d->udev->dev, "media controller created\n");
#endif
	return 0;
}

static int  dvb_usb_media_device_register(struct dvb_usb_adapter *adap)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
	return media_device_register(adap->dvb_adap.mdev);
#else
	return 0;
#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);
	media_device_cleanup(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;

	ret = dvb_usb_media_device_init(adap);
	if (ret < 0) {
		deb_info("dvb_usb_media_device_init failed: error %d", ret);
		goto err_mc;
	}

	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);
err_mc:
	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++;
	}

	ret = dvb_create_media_graph(&adap->dvb_adap, true);
	if (ret)
		return ret;

	ret = dvb_usb_media_device_register(adap);

	return ret;
}

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;
}