cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

dvb_usb_urb.c (2510B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * DVB USB framework
      4 *
      5 * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@posteo.de>
      6 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
      7 */
      8
      9#include "dvb_usb_common.h"
     10
     11static int dvb_usb_v2_generic_io(struct dvb_usb_device *d,
     12		u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
     13{
     14	int ret, actual_length;
     15
     16	if (!wbuf || !wlen || !d->props->generic_bulk_ctrl_endpoint ||
     17			!d->props->generic_bulk_ctrl_endpoint_response) {
     18		dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, -EINVAL);
     19		return -EINVAL;
     20	}
     21
     22	dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);
     23
     24	ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev,
     25			d->props->generic_bulk_ctrl_endpoint), wbuf, wlen,
     26			&actual_length, 2000);
     27	if (ret) {
     28		dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
     29				KBUILD_MODNAME, ret);
     30		return ret;
     31	}
     32	if (actual_length != wlen) {
     33		dev_err(&d->udev->dev, "%s: usb_bulk_msg() write length=%d, actual=%d\n",
     34			KBUILD_MODNAME, wlen, actual_length);
     35		return -EIO;
     36	}
     37
     38	/* an answer is expected */
     39	if (rbuf && rlen) {
     40		if (d->props->generic_bulk_ctrl_delay)
     41			usleep_range(d->props->generic_bulk_ctrl_delay,
     42					d->props->generic_bulk_ctrl_delay
     43					+ 20000);
     44
     45		ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
     46				d->props->generic_bulk_ctrl_endpoint_response),
     47				rbuf, rlen, &actual_length, 2000);
     48		if (ret)
     49			dev_err(&d->udev->dev,
     50					"%s: 2nd usb_bulk_msg() failed=%d\n",
     51					KBUILD_MODNAME, ret);
     52
     53		dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__,
     54				actual_length, rbuf);
     55	}
     56
     57	return ret;
     58}
     59
     60int dvb_usbv2_generic_rw(struct dvb_usb_device *d,
     61		u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
     62{
     63	int ret;
     64
     65	mutex_lock(&d->usb_mutex);
     66	ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
     67	mutex_unlock(&d->usb_mutex);
     68
     69	return ret;
     70}
     71EXPORT_SYMBOL(dvb_usbv2_generic_rw);
     72
     73int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
     74{
     75	int ret;
     76
     77	mutex_lock(&d->usb_mutex);
     78	ret = dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
     79	mutex_unlock(&d->usb_mutex);
     80
     81	return ret;
     82}
     83EXPORT_SYMBOL(dvb_usbv2_generic_write);
     84
     85int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d,
     86		u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
     87{
     88	return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
     89}
     90EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);
     91
     92int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len)
     93{
     94	return dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
     95}
     96EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);