drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c

   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
  11 static 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
  60 int 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 }
  71 EXPORT_SYMBOL(dvb_usbv2_generic_rw);
  72
  73 int 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 }
  83 EXPORT_SYMBOL(dvb_usbv2_generic_write);
  84
  85 int 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 }
  90 EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);
  91
  92 int 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 }
  96 EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);