Quelle  dvb-usb-urb.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* dvb-usb-urb.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 keeps functions for initializing and handling the
 * USB and URB stuff.
 */
#include "dvb-usb-common.h"

int dvb_usb_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
 u16 rlen, int delay_ms)
{
 int actlen = 0, ret = -ENOMEM;

 if (!d || wbuf == NULL || wlen == 0)
  return -EINVAL;

 if (d->props.generic_bulk_ctrl_endpoint == 0) {
  err("endpoint for generic control not specified.");
  return -EINVAL;
 }

 if ((ret = mutex_lock_interruptible(&d->usb_mutex)))
  return ret;

 deb_xfer(">>> ");
 debug_dump(wbuf,wlen,deb_xfer);

 ret = usb_bulk_msg(d->udev,usb_sndbulkpipe(d->udev,
   d->props.generic_bulk_ctrl_endpoint), wbuf,wlen,&actlen,
   2000);

 if (ret)
  err("bulk message failed: %d (%d/%d)",ret,wlen,actlen);
 else
  ret = actlen != wlen ? -1 : 0;

 /* an answer is expected, and no error before */
 if (!ret && rbuf && rlen) {
  if (delay_ms)
   msleep(delay_ms);

  ret = usb_bulk_msg(d->udev,usb_rcvbulkpipe(d->udev,
    d->props.generic_bulk_ctrl_endpoint_response ?
    d->props.generic_bulk_ctrl_endpoint_response :
    d->props.generic_bulk_ctrl_endpoint),rbuf,rlen,&actlen,
    2000);

  if (ret)
   err("recv bulk message failed: %d",ret);
  else {
   deb_xfer("<<< ");
   debug_dump(rbuf,actlen,deb_xfer);
  }
 }

 mutex_unlock(&d->usb_mutex);
 return ret;
}
EXPORT_SYMBOL(dvb_usb_generic_rw);

int dvb_usb_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
{
 return dvb_usb_generic_rw(d,buf,len,NULL,0,0);
}
EXPORT_SYMBOL(dvb_usb_generic_write);

static void dvb_usb_data_complete(struct usb_data_stream *stream, u8 *buffer, size_t length)
{
 struct dvb_usb_adapter *adap = stream->user_priv;
 if (adap->feedcount > 0 && adap->state & DVB_USB_ADAP_STATE_DVB)
  dvb_dmx_swfilter(&adap->demux, buffer, length);
}

static void dvb_usb_data_complete_204(struct usb_data_stream *stream, u8 *buffer, size_t length)
{
 struct dvb_usb_adapter *adap = stream->user_priv;
 if (adap->feedcount > 0 && adap->state & DVB_USB_ADAP_STATE_DVB)
  dvb_dmx_swfilter_204(&adap->demux, buffer, length);
}

static void dvb_usb_data_complete_raw(struct usb_data_stream *stream,
          u8 *buffer, size_t length)
{
 struct dvb_usb_adapter *adap = stream->user_priv;
 if (adap->feedcount > 0 && adap->state & DVB_USB_ADAP_STATE_DVB)
  dvb_dmx_swfilter_raw(&adap->demux, buffer, length);
}

int dvb_usb_adapter_stream_init(struct dvb_usb_adapter *adap)
{
 int i, ret = 0;
 for (i = 0; i < adap->props.num_frontends; i++) {

  adap->fe_adap[i].stream.udev      = adap->dev->udev;
  if (adap->props.fe[i].caps & DVB_USB_ADAP_RECEIVES_204_BYTE_TS)
   adap->fe_adap[i].stream.complete =
    dvb_usb_data_complete_204;
  else
  if (adap->props.fe[i].caps & DVB_USB_ADAP_RECEIVES_RAW_PAYLOAD)
   adap->fe_adap[i].stream.complete =
    dvb_usb_data_complete_raw;
  else
  adap->fe_adap[i].stream.complete  = dvb_usb_data_complete;
  adap->fe_adap[i].stream.user_priv = adap;
  ret = usb_urb_init(&adap->fe_adap[i].stream,
       &adap->props.fe[i].stream);
  if (ret < 0)
   break;
 }
 return ret;
}

int dvb_usb_adapter_stream_exit(struct dvb_usb_adapter *adap)
{
 int i;
 for (i = 0; i < adap->props.num_frontends; i++)
  usb_urb_exit(&adap->fe_adap[i].stream);
 return 0;
}