Quelle  dvb-usb-dvb.c   Sprache: 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("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;
   }
  }

  deb_ts("submitting all URBs\n");
  usb_urb_submit(&adap->fe_adap[adap->active_fe].stream);
 }
 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;

 mutex_lock(&adap->dvb_adap.mdev_lock);

 media_device_unregister(adap->dvb_adap.mdev);
 media_device_cleanup(adap->dvb_adap.mdev);
 kfree(adap->dvb_adap.mdev);
 adap->dvb_adap.mdev = NULL;

 mutex_unlock(&adap->dvb_adap.mdev_lock);
#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;
}