summaryrefslogtreecommitdiffstats
path: root/tools/usb/usbip/libsrc/usbip_device_driver.c
blob: 927a151fa9aa9e52c5c721f20c34d1682575b17f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
 *		 2015 Samsung Electronics
 * Author:	 Igor Kotrasinski <i.kotrasinsk@samsung.com>
 *
 * Based on tools/usb/usbip/libsrc/usbip_host_driver.c, which is:
 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
 *               2005-2007 Takahiro Hirofuchi
 */

#include <fcntl.h>
#include <string.h>
#include <linux/usb/ch9.h>

#include <unistd.h>

#include "usbip_host_common.h"
#include "usbip_device_driver.h"

#undef  PROGNAME
#define PROGNAME "libusbip"

#define copy_descr_attr16(dev, descr, attr)			\
		((dev)->attr = le16toh((descr)->attr))		\

#define copy_descr_attr(dev, descr, attr)			\
		((dev)->attr = (descr)->attr)			\

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

static struct {
	enum usb_device_speed speed;
	const char *name;
} speed_names[] = {
	{
		.speed = USB_SPEED_UNKNOWN,
		.name = "UNKNOWN",
	},
	{
		.speed = USB_SPEED_LOW,
		.name = "low-speed",
	},
	{
		.speed = USB_SPEED_FULL,
		.name = "full-speed",
	},
	{
		.speed = USB_SPEED_HIGH,
		.name = "high-speed",
	},
	{
		.speed = USB_SPEED_WIRELESS,
		.name = "wireless",
	},
	{
		.speed = USB_SPEED_SUPER,
		.name = "super-speed",
	},
};

static
int read_usb_vudc_device(struct udev_device *sdev, struct usbip_usb_device *dev)
{
	const char *path, *name;
	char filepath[SYSFS_PATH_MAX];
	struct usb_device_descriptor descr;
	unsigned int i;
	FILE *fd = NULL;
	struct udev_device *plat;
	const char *speed;
	size_t ret;

	plat = udev_device_get_parent(sdev);
	path = udev_device_get_syspath(plat);
	snprintf(filepath, SYSFS_PATH_MAX, "%s/%s",
		 path, VUDC_DEVICE_DESCR_FILE);
	fd = fopen(filepath, "r");
	if (!fd)
		return -1;
	ret = fread((char *) &descr, sizeof(descr), 1, fd);
	if (ret != 1) {
		err("Cannot read vudc device descr file: %s", strerror(errno));
		goto err;
	}
	fclose(fd);

	copy_descr_attr(dev, &descr, bDeviceClass);
	copy_descr_attr(dev, &descr, bDeviceSubClass);
	copy_descr_attr(dev, &descr, bDeviceProtocol);
	copy_descr_attr(dev, &descr, bNumConfigurations);
	copy_descr_attr16(dev, &descr, idVendor);
	copy_descr_attr16(dev, &descr, idProduct);
	copy_descr_attr16(dev, &descr, bcdDevice);

	strncpy(dev->path, path, SYSFS_PATH_MAX - 1);
	dev->path[SYSFS_PATH_MAX - 1] = '\0';

	dev->speed = USB_SPEED_UNKNOWN;
	speed = udev_device_get_sysattr_value(sdev, "current_speed");
	if (speed) {
		for (i = 0; i < ARRAY_SIZE(speed_names); i++) {
			if (!strcmp(speed_names[i].name, speed)) {
				dev->speed = speed_names[i].speed;
				break;
			}
		}
	}

	/* Only used for user output, little sense to output them in general */
	dev->bNumInterfaces = 0;
	dev->bConfigurationValue = 0;
	dev->busnum = 0;

	name = udev_device_get_sysname(plat);
	strncpy(dev->busid, name, SYSFS_BUS_ID_SIZE - 1);
	dev->busid[SYSFS_BUS_ID_SIZE - 1] = '\0';
	return 0;
err:
	fclose(fd);
	return -1;
}

static int is_my_device(struct udev_device *dev)
{
	const char *driver;

	driver = udev_device_get_property_value(dev, "USB_UDC_NAME");
	return driver != NULL && !strcmp(driver, USBIP_DEVICE_DRV_NAME);
}

static int usbip_device_driver_open(struct usbip_host_driver *hdriver)
{
	int ret;

	hdriver->ndevs = 0;
	INIT_LIST_HEAD(&hdriver->edev_list);

	ret = usbip_generic_driver_open(hdriver);
	if (ret)
		err("please load " USBIP_CORE_MOD_NAME ".ko and "
		    USBIP_DEVICE_DRV_NAME ".ko!");

	return ret;
}

struct usbip_host_driver device_driver = {
	.edev_list = LIST_HEAD_INIT(device_driver.edev_list),
	.udev_subsystem = "udc",
	.ops = {
		.open = usbip_device_driver_open,
		.close = usbip_generic_driver_close,
		.refresh_device_list = usbip_generic_refresh_device_list,
		.get_device = usbip_generic_get_device,
		.read_device = read_usb_vudc_device,
		.is_my_device = is_my_device,
	},
};