dvb_usb_urb.c

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/*
 * DVB USB framework
 *
 * Copyright (C) 2004-6 Patrick Boettcher <[email protected]>
 * Copyright (C) 2012 Antti Palosaari <[email protected]>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "dvb_usb_common.h"

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

    if (!d || !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;
    }

    mutex_lock(&d->usb_mutex);

    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 < 0)
        dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
                KBUILD_MODNAME, ret);
    else
        ret = actual_length != wlen ? -EIO : 0;

    /* an answer is expected, and no error before */
    if (!ret && 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);
    }

    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)
{
    return dvb_usbv2_generic_rw(d, buf, len, NULL, 0);
}
EXPORT_SYMBOL(dvb_usbv2_generic_write);