// 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);