Pileus Git - ~andy/linux/blob - drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c

   1 /*
   2  * DVB USB framework
   3  *
   4  * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@desy.de>
   5  * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License along
  18  *    with this program; if not, write to the Free Software Foundation, Inc.,
  19  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "dvb_usb_common.h"
  23
  24 int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
  25                 u16 rlen)
  26 {
  27         int ret, actual_length;
  28
  29         if (!d || !wbuf || !wlen || !d->props->generic_bulk_ctrl_endpoint ||
  30                         !d->props->generic_bulk_ctrl_endpoint_response) {
  31                 dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, -EINVAL);
  32                 return -EINVAL;
  33         }
  34
  35         ret = mutex_lock_interruptible(&d->usb_mutex);
  36         if (ret < 0)
  37                 return ret;
  38
  39         dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);
  40
  41         ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev,
  42                         d->props->generic_bulk_ctrl_endpoint), wbuf, wlen,
  43                         &actual_length, 2000);
  44         if (ret < 0)
  45                 dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
  46                                 KBUILD_MODNAME, ret);
  47         else
  48                 ret = actual_length != wlen ? -EIO : 0;
  49
  50         /* an answer is expected, and no error before */
  51         if (!ret && rbuf && rlen) {
  52                 if (d->props->generic_bulk_ctrl_delay)
  53                         usleep_range(d->props->generic_bulk_ctrl_delay,
  54                                         d->props->generic_bulk_ctrl_delay
  55                                         + 20000);
  56
  57                 ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
  58                                 d->props->generic_bulk_ctrl_endpoint_response),
  59                                 rbuf, rlen, &actual_length, 2000);
  60                 if (ret)
  61                         dev_err(&d->udev->dev, "%s: 2nd usb_bulk_msg() " \
  62                                         "failed=%d\n", KBUILD_MODNAME, ret);
  63
  64                 dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__,
  65                                 actual_length, rbuf);
  66         }
  67
  68         mutex_unlock(&d->usb_mutex);
  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         return dvb_usbv2_generic_rw(d, buf, len, NULL, 0);
  76 }
  77 EXPORT_SYMBOL(dvb_usbv2_generic_write);