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 
32 static 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 
62 static
read_usb_vudc_device(struct udev_device * sdev,struct usbip_usb_device * dev)63 int 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;
119 err:
120 	fclose(fd);
121 	return -1;
122 }
123 
is_my_device(struct udev_device * dev)124 static 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 
usbip_device_driver_open(struct usbip_host_driver * hdriver)132 static 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 
147 struct 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