1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
4 *		 2015 Samsung Electronics
5 * Author:	 Igor Kotrasinski <i.kotrasinsk@samsung.com>
6 *
7 * Based on tools/usb/usbip/libsrc/usbip_host_driver.c, which is:
8 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
9 *               2005-2007 Takahiro Hirofuchi
10 */
11
12#include <fcntl.h>
13#include <string.h>
14#include <linux/usb/ch9.h>
15
16#include <unistd.h>
17
18#include "usbip_host_common.h"
19#include "usbip_device_driver.h"
20
21#undef  PROGNAME
22#define PROGNAME "libusbip"
23
24#define copy_descr_attr16(dev, descr, attr)			\
25		((dev)->attr = le16toh((descr)->attr))		\
26
27#define copy_descr_attr(dev, descr, attr)			\
28		((dev)->attr = (descr)->attr)			\
29
30#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
31
32static struct {
33	enum usb_device_speed speed;
34	const char *name;
35} speed_names[] = {
36	{
37		.speed = USB_SPEED_UNKNOWN,
38		.name = "UNKNOWN",
39	},
40	{
41		.speed = USB_SPEED_LOW,
42		.name = "low-speed",
43	},
44	{
45		.speed = USB_SPEED_FULL,
46		.name = "full-speed",
47	},
48	{
49		.speed = USB_SPEED_HIGH,
50		.name = "high-speed",
51	},
52	{
53		.speed = USB_SPEED_WIRELESS,
54		.name = "wireless",
55	},
56	{
57		.speed = USB_SPEED_SUPER,
58		.name = "super-speed",
59	},
60};
61
62static
63int read_usb_vudc_device(struct udev_device *sdev, struct usbip_usb_device *dev)
64{
65	const char *path, *name;
66	char filepath[SYSFS_PATH_MAX];
67	struct usb_device_descriptor descr;
68	unsigned int i;
69	FILE *fd = NULL;
70	struct udev_device *plat;
71	const char *speed;
72	size_t ret;
73
74	plat = udev_device_get_parent(sdev);
75	path = udev_device_get_syspath(plat);
76	snprintf(filepath, SYSFS_PATH_MAX, "%s/%s",
77		 path, VUDC_DEVICE_DESCR_FILE);
78	fd = fopen(filepath, "r");
79	if (!fd)
80		return -1;
81	ret = fread((char *) &descr, sizeof(descr), 1, fd);
82	if (ret != 1) {
83		err("Cannot read vudc device descr file: %s", strerror(errno));
84		goto err;
85	}
86	fclose(fd);
87
88	copy_descr_attr(dev, &descr, bDeviceClass);
89	copy_descr_attr(dev, &descr, bDeviceSubClass);
90	copy_descr_attr(dev, &descr, bDeviceProtocol);
91	copy_descr_attr(dev, &descr, bNumConfigurations);
92	copy_descr_attr16(dev, &descr, idVendor);
93	copy_descr_attr16(dev, &descr, idProduct);
94	copy_descr_attr16(dev, &descr, bcdDevice);
95
96	strncpy(dev->path, path, SYSFS_PATH_MAX - 1);
97	dev->path[SYSFS_PATH_MAX - 1] = '\0';
98
99	dev->speed = USB_SPEED_UNKNOWN;
100	speed = udev_device_get_sysattr_value(sdev, "current_speed");
101	if (speed) {
102		for (i = 0; i < ARRAY_SIZE(speed_names); i++) {
103			if (!strcmp(speed_names[i].name, speed)) {
104				dev->speed = speed_names[i].speed;
105				break;
106			}
107		}
108	}
109
110	/* Only used for user output, little sense to output them in general */
111	dev->bNumInterfaces = 0;
112	dev->bConfigurationValue = 0;
113	dev->busnum = 0;
114
115	name = udev_device_get_sysname(plat);
116	strncpy(dev->busid, name, SYSFS_BUS_ID_SIZE - 1);
117	dev->busid[SYSFS_BUS_ID_SIZE - 1] = '\0';
118	return 0;
119err:
120	fclose(fd);
121	return -1;
122}
123
124static int is_my_device(struct udev_device *dev)
125{
126	const char *driver;
127
128	driver = udev_device_get_property_value(dev, "USB_UDC_NAME");
129	return driver != NULL && !strcmp(driver, USBIP_DEVICE_DRV_NAME);
130}
131
132static int usbip_device_driver_open(struct usbip_host_driver *hdriver)
133{
134	int ret;
135
136	hdriver->ndevs = 0;
137	INIT_LIST_HEAD(&hdriver->edev_list);
138
139	ret = usbip_generic_driver_open(hdriver);
140	if (ret)
141		err("please load " USBIP_CORE_MOD_NAME ".ko and "
142		    USBIP_DEVICE_DRV_NAME ".ko!");
143
144	return ret;
145}
146
147struct usbip_host_driver device_driver = {
148	.edev_list = LIST_HEAD_INIT(device_driver.edev_list),
149	.udev_subsystem = "udc",
150	.ops = {
151		.open = usbip_device_driver_open,
152		.close = usbip_generic_driver_close,
153		.refresh_device_list = usbip_generic_refresh_device_list,
154		.get_device = usbip_generic_get_device,
155		.read_device = read_usb_vudc_device,
156		.is_my_device = is_my_device,
157	},
158};
159