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
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
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
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
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