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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015 Karol Kosik <[email protected]>
4 * 2015 Samsung Electronics
5 * Author: Igor Kotrasinski <[email protected]>
6 *
7 * Based on tools/usb/usbip/libsrc/usbip_host_driver.c, which is:
8 * Copyright (C) 2011 matt mooney <[email protected]>
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 .speed = USB_SPEED_SUPER_PLUS,
62 .name = "super-speed-plus",
63 },
64};
65
66static
67int read_usb_vudc_device(struct udev_device *sdev, struct usbip_usb_device *dev)
68{
69 const char *path, *name;
70 char filepath[SYSFS_PATH_MAX];
71 struct usb_device_descriptor descr;
72 unsigned int i;
73 FILE *fd = NULL;
74 struct udev_device *plat;
75 const char *speed;
76 size_t ret;
77
78 plat = udev_device_get_parent(sdev);
79 path = udev_device_get_syspath(plat);
80 snprintf(filepath, SYSFS_PATH_MAX, "%s/%s",
81 path, VUDC_DEVICE_DESCR_FILE);
82 fd = fopen(filepath, "r");
83 if (!fd)
84 return -1;
85 ret = fread((char *) &descr, sizeof(descr), 1, fd);
86 if (ret != 1) {
87 err("Cannot read vudc device descr file: %s", strerror(errno));
88 goto err;
89 }
90 fclose(fd);
91
92 copy_descr_attr(dev, &descr, bDeviceClass);
93 copy_descr_attr(dev, &descr, bDeviceSubClass);
94 copy_descr_attr(dev, &descr, bDeviceProtocol);
95 copy_descr_attr(dev, &descr, bNumConfigurations);
96 copy_descr_attr16(dev, &descr, idVendor);
97 copy_descr_attr16(dev, &descr, idProduct);
98 copy_descr_attr16(dev, &descr, bcdDevice);
99
100 strncpy(dev->path, path, SYSFS_PATH_MAX - 1);
101 dev->path[SYSFS_PATH_MAX - 1] = '\0';
102
103 dev->speed = USB_SPEED_UNKNOWN;
104 speed = udev_device_get_sysattr_value(sdev, "current_speed");
105 if (speed) {
106 for (i = 0; i < ARRAY_SIZE(speed_names); i++) {
107 if (!strcmp(speed_names[i].name, speed)) {
108 dev->speed = speed_names[i].speed;
109 break;
110 }
111 }
112 }
113
114 /* Only used for user output, little sense to output them in general */
115 dev->bNumInterfaces = 0;
116 dev->bConfigurationValue = 0;
117 dev->busnum = 0;
118
119 name = udev_device_get_sysname(plat);
120 strncpy(dev->busid, name, SYSFS_BUS_ID_SIZE - 1);
121 dev->busid[SYSFS_BUS_ID_SIZE - 1] = '\0';
122 return 0;
123err:
124 fclose(fd);
125 return -1;
126}
127
128static int is_my_device(struct udev_device *dev)
129{
130 const char *driver;
131
132 driver = udev_device_get_property_value(dev, "USB_UDC_NAME");
133 return driver != NULL && !strcmp(driver, USBIP_DEVICE_DRV_NAME);
134}
135
136static int usbip_device_driver_open(struct usbip_host_driver *hdriver)
137{
138 int ret;
139
140 hdriver->ndevs = 0;
141 INIT_LIST_HEAD(&hdriver->edev_list);
142
143 ret = usbip_generic_driver_open(hdriver);
144 if (ret || hdriver->ndevs == 0)
145 info("please load " USBIP_CORE_MOD_NAME ".ko and "
146 USBIP_DEVICE_DRV_NAME ".ko");
147
148 return ret;
149}
150
151struct usbip_host_driver device_driver = {
152 .edev_list = LIST_HEAD_INIT(device_driver.edev_list),
153 .udev_subsystem = "udc",
154 .ops = {
155 .open = usbip_device_driver_open,
156 .close = usbip_generic_driver_close,
157 .refresh_device_list = usbip_generic_refresh_device_list,
158 .get_device = usbip_generic_get_device,
159 .read_device = read_usb_vudc_device,
160 .is_my_device = is_my_device,
161 },
162};