1 /*
2  * DVB USB framework
3  *
4  * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@posteo.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);
105