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) {
  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);
  97