Quelle  dvb_usb_urb.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * DVB USB framework
 *
 * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@posteo.de>
 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
 */

#include "dvb_usb_common.h"

static int dvb_usb_v2_generic_io(struct dvb_usb_device *d,
  u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
 int ret, actual_length;

 if (!wbuf || !wlen || !d->props->generic_bulk_ctrl_endpoint ||
   !d->props->generic_bulk_ctrl_endpoint_response) {
  dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, -EINVAL);
  return -EINVAL;
 }

 dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);

 ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev,
   d->props->generic_bulk_ctrl_endpoint), wbuf, wlen,
   &actual_length, 2000);
 if (ret) {
  dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
    KBUILD_MODNAME, ret);
  return ret;
 }
 if (actual_length != wlen) {
  dev_err(&d->udev->dev, "%s: usb_bulk_msg() write length=%d, actual=%d\n",
   KBUILD_MODNAME, wlen, actual_length);
  return -EIO;
 }

 /* an answer is expected */
 if (rbuf && rlen) {
  if (d->props->generic_bulk_ctrl_delay)
   usleep_range(d->props->generic_bulk_ctrl_delay,
     d->props->generic_bulk_ctrl_delay
     + 20000);

  ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
    d->props->generic_bulk_ctrl_endpoint_response),
    rbuf, rlen, &actual_length, 2000);
  if (ret)
   dev_err(&d->udev->dev,
     "%s: 2nd usb_bulk_msg() failed=%d\n",
     KBUILD_MODNAME, ret);

  dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__,
    actual_length, rbuf);
 }

 return ret;
}

int dvb_usbv2_generic_rw(struct dvb_usb_device *d,
  u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
 int ret;

 mutex_lock(&d->usb_mutex);
 ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
 mutex_unlock(&d->usb_mutex);

 return ret;
}
EXPORT_SYMBOL(dvb_usbv2_generic_rw);

int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
{
 int ret;

 mutex_lock(&d->usb_mutex);
 ret = dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
 mutex_unlock(&d->usb_mutex);

 return ret;
}
EXPORT_SYMBOL(dvb_usbv2_generic_write);

int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d,
  u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
 return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
}
EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);

int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len)
{
 return dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
}
EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);