[go: nahoru, domu]
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 (!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