Linux Kernel  3.7.1
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dvb_usb_urb.c
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1 /*
2  * DVB USB framework
3  *
4  * Copyright (C) 2004-6 Patrick Boettcher <[email protected]>
5  * Copyright (C) 2012 Antti Palosaari <[email protected]>
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  mutex_lock(&d->usb_mutex);
36 
37  dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);
38 
39  ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev,
40  d->props->generic_bulk_ctrl_endpoint), wbuf, wlen,
41  &actual_length, 2000);
42  if (ret < 0)
43  dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
44  KBUILD_MODNAME, ret);
45  else
46  ret = actual_length != wlen ? -EIO : 0;
47 
48  /* an answer is expected, and no error before */
49  if (!ret && rbuf && rlen) {
50  if (d->props->generic_bulk_ctrl_delay)
51  usleep_range(d->props->generic_bulk_ctrl_delay,
52  d->props->generic_bulk_ctrl_delay
53  + 20000);
54 
55  ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
56  d->props->generic_bulk_ctrl_endpoint_response),
57  rbuf, rlen, &actual_length, 2000);
58  if (ret)
59  dev_err(&d->udev->dev, "%s: 2nd usb_bulk_msg() " \
60  "failed=%d\n", KBUILD_MODNAME, ret);
61 
62  dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__,
63  actual_length, rbuf);
64  }
65 
67  return ret;
68 }
70 
72 {
73  return dvb_usbv2_generic_rw(d, buf, len, NULL, 0);
74 }