1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * DVB USB framework
4 *
5 * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@posteo.de>
6 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
7 */
8
9#include "dvb_usb_common.h"
10
11static int dvb_usb_v2_generic_io(struct dvb_usb_device *d,
12 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
13{
14 int ret, actual_length;
15
16 if (!wbuf || !wlen || !d->props->generic_bulk_ctrl_endpoint ||
17 !d->props->generic_bulk_ctrl_endpoint_response) {
18 dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, -EINVAL);
19 return -EINVAL;
20 }
21
22 dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);
23
24 ret = usb_bulk_msg(usb_dev: d->udev, usb_sndbulkpipe(d->udev,
25 d->props->generic_bulk_ctrl_endpoint), data: wbuf, len: wlen,
26 actual_length: &actual_length, timeout: 2000);
27 if (ret) {
28 dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n",
29 KBUILD_MODNAME, ret);
30 return ret;
31 }
32 if (actual_length != wlen) {
33 dev_err(&d->udev->dev, "%s: usb_bulk_msg() write length=%d, actual=%d\n",
34 KBUILD_MODNAME, wlen, actual_length);
35 return -EIO;
36 }
37
38 /* an answer is expected */
39 if (rbuf && rlen) {
40 if (d->props->generic_bulk_ctrl_delay)
41 usleep_range(min: d->props->generic_bulk_ctrl_delay,
42 max: d->props->generic_bulk_ctrl_delay
43 + 20000);
44
45 ret = usb_bulk_msg(usb_dev: d->udev, usb_rcvbulkpipe(d->udev,
46 d->props->generic_bulk_ctrl_endpoint_response),
47 data: rbuf, len: rlen, actual_length: &actual_length, timeout: 2000);
48 if (ret)
49 dev_err(&d->udev->dev,
50 "%s: 2nd usb_bulk_msg() failed=%d\n",
51 KBUILD_MODNAME, ret);
52
53 dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__,
54 actual_length, rbuf);
55 }
56
57 return ret;
58}
59
60int dvb_usbv2_generic_rw(struct dvb_usb_device *d,
61 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
62{
63 int ret;
64
65 mutex_lock(&d->usb_mutex);
66 ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
67 mutex_unlock(lock: &d->usb_mutex);
68
69 return ret;
70}
71EXPORT_SYMBOL(dvb_usbv2_generic_rw);
72
73int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
74{
75 int ret;
76
77 mutex_lock(&d->usb_mutex);
78 ret = dvb_usb_v2_generic_io(d, wbuf: buf, wlen: len, NULL, rlen: 0);
79 mutex_unlock(lock: &d->usb_mutex);
80
81 return ret;
82}
83EXPORT_SYMBOL(dvb_usbv2_generic_write);
84
85int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d,
86 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
87{
88 return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
89}
90EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);
91
92int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len)
93{
94 return dvb_usb_v2_generic_io(d, wbuf: buf, wlen: len, NULL, rlen: 0);
95}
96EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);
97

source code of linux/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c