LXR linux/drivers/media/usb/dvb-usb-v2/dvb_usb

   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 < 0)
  28                dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
  29                                KBUILD_MODNAME, ret);
  30        else
  31                ret = actual_length != wlen ? -EIO : 0;
  32
  33        /* an answer is expected, and no error before */
  34        if (!ret && rbuf && rlen) {
  35                if (d->props->generic_bulk_ctrl_delay)
  36                        usleep_range(d->props->generic_bulk_ctrl_delay,
  37                                        d->props->generic_bulk_ctrl_delay
  38                                        + 20000);
  39
  40                ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
  41                                d->props->generic_bulk_ctrl_endpoint_response),
  42                                rbuf, rlen, &actual_length, 2000);
  43                if (ret)
  44                        dev_err(&d->udev->dev,
  45                                        "%s: 2nd usb_bulk_msg() failed=%d\n",
  46                                        KBUILD_MODNAME, ret);
  47
  48                dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__,
  49                                actual_length, rbuf);
  50        }
  51
  52        return ret;
  53}
  54
  55int dvb_usbv2_generic_rw(struct dvb_usb_device *d,
  56                u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
  57{
  58        int ret;
  59
  60        mutex_lock(&d->usb_mutex);
  61        ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
  62        mutex_unlock(&d->usb_mutex);
  63
  64        return ret;
  65}
  66EXPORT_SYMBOL(dvb_usbv2_generic_rw);
  67
  68int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
  69{
  70        int ret;
  71
  72        mutex_lock(&d->usb_mutex);
  73        ret = dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
  74        mutex_unlock(&d->usb_mutex);
  75
  76        return ret;
  77}
  78EXPORT_SYMBOL(dvb_usbv2_generic_write);
  79
  80int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d,
  81                u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
  82{
  83        return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
  84}
  85EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);
  86
  87int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len)
  88{
  89        return dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
  90}
  91EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);
  92