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

   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
  24static 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 (!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        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
  68int 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}
  79EXPORT_SYMBOL(dvb_usbv2_generic_rw);
  80
  81int 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}
  91EXPORT_SYMBOL(dvb_usbv2_generic_write);
  92
  93int 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}
  98EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);
  99
 100int 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}
 104EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);
 105