kernel/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 static int dvb_usb_v2_generic_io(struct dvb_usb_device *d,
  25                 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
  26 {
  27         int ret, actual_length;
  28
  29         if (!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         dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);
  36
  37         ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev,
  38                         d->props->generic_bulk_ctrl_endpoint), wbuf, wlen,
  39                         &actual_length, 2000);
  40         if (ret < 0)
  41                 dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
  42                                 KBUILD_MODNAME, ret);
  43         else
  44                 ret = actual_length != wlen ? -EIO : 0;
  45
  46         /* an answer is expected, and no error before */
  47         if (!ret && rbuf && rlen) {
  48                 if (d->props->generic_bulk_ctrl_delay)
  49                         usleep_range(d->props->generic_bulk_ctrl_delay,
  50                                         d->props->generic_bulk_ctrl_delay
  51                                         + 20000);
  52
  53                 ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
  54                                 d->props->generic_bulk_ctrl_endpoint_response),
  55                                 rbuf, rlen, &actual_length, 2000);
  56                 if (ret)
  57                         dev_err(&d->udev->dev,
  58                                         "%s: 2nd usb_bulk_msg() failed=%d\n",
  59                                         KBUILD_MODNAME, ret);
  60
  61                 dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__,
  62                                 actual_length, rbuf);
  63         }
  64
  65         return ret;
  66 }
  67
  68 int dvb_usbv2_generic_rw(struct dvb_usb_device *d,
  69                 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
  70 {
  71         int ret;
  72
  73         mutex_lock(&d->usb_mutex);
  74         ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
  75         mutex_unlock(&d->usb_mutex);
  76
  77         return ret;
  78 }
  79 EXPORT_SYMBOL(dvb_usbv2_generic_rw);
  80
  81 int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
  82 {
  83         int ret;
  84
  85         mutex_lock(&d->usb_mutex);
  86         ret = dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
  87         mutex_unlock(&d->usb_mutex);
  88
  89         return ret;
  90 }
  91 EXPORT_SYMBOL(dvb_usbv2_generic_write);
  92
  93 int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d,
  94                 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
  95 {
  96         return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
  97 }
  98 EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);
  99
 100 int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len)
 101 {
 102         return dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
 103 }
 104 EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);