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(d->udev, usb_sndbulkpipe(d->udev,
25			d->props->generic_bulk_ctrl_endpoint), wbuf, wlen,
26			&actual_length, 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(d->props->generic_bulk_ctrl_delay,
42					d->props->generic_bulk_ctrl_delay
43					+ 20000);
44
45		ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
46				d->props->generic_bulk_ctrl_endpoint_response),
47				rbuf, rlen, &actual_length, 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(&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, buf, len, NULL, 0);
79	mutex_unlock(&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, buf, len, NULL, 0);
95}
96EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);
97