tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 int ret = 0;
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 < 0)
83 goto err;
84 fclose(fd);
85
86 copy_descr_attr(dev, &descr, bDeviceClass);
87 copy_descr_attr(dev, &descr, bDeviceSubClass);
88 copy_descr_attr(dev, &descr, bDeviceProtocol);
89 copy_descr_attr(dev, &descr, bNumConfigurations);
90 copy_descr_attr16(dev, &descr, idVendor);
91 copy_descr_attr16(dev, &descr, idProduct);
92 copy_descr_attr16(dev, &descr, bcdDevice);
93
94 strncpy(dev->path, path, SYSFS_PATH_MAX - 1);
95 dev->path[SYSFS_PATH_MAX - 1] = '\0';
96
97 dev->speed = USB_SPEED_UNKNOWN;
98 speed = udev_device_get_sysattr_value(sdev, "current_speed");
99 if (speed) {
100 for (i = 0; i < ARRAY_SIZE(speed_names); i++) {
101 if (!strcmp(speed_names[i].name, speed)) {
102 dev->speed = speed_names[i].speed;
103 break;
104 }
105 }
106 }
107
108 /* Only used for user output, little sense to output them in general */
109 dev->bNumInterfaces = 0;
110 dev->bConfigurationValue = 0;
111 dev->busnum = 0;
112
113 name = udev_device_get_sysname(plat);
114 strncpy(dev->busid, name, SYSFS_BUS_ID_SIZE - 1);
115 dev->busid[SYSFS_BUS_ID_SIZE - 1] = '\0';
116 return 0;
117err:
118 fclose(fd);
119 return -1;
120}
121
122static int is_my_device(struct udev_device *dev)
123{
124 const char *driver;
125
126 driver = udev_device_get_property_value(dev, "USB_UDC_NAME");
127 return driver != NULL && !strcmp(driver, USBIP_DEVICE_DRV_NAME);
128}
129
130static int usbip_device_driver_open(struct usbip_host_driver *hdriver)
131{
132 int ret;
133
134 hdriver->ndevs = 0;
135 INIT_LIST_HEAD(&hdriver->edev_list);
136
137 ret = usbip_generic_driver_open(hdriver);
138 if (ret)
139 err("please load " USBIP_CORE_MOD_NAME ".ko and "
140 USBIP_DEVICE_DRV_NAME ".ko!");
141
142 return ret;
143}
144
145struct usbip_host_driver device_driver = {
146 .edev_list = LIST_HEAD_INIT(device_driver.edev_list),
147 .udev_subsystem = "udc",
148 .ops = {
149 .open = usbip_device_driver_open,
150 .close = usbip_generic_driver_close,
151 .refresh_device_list = usbip_generic_refresh_device_list,
152 .get_device = usbip_generic_get_device,
153 .read_device = read_usb_vudc_device,
154 .is_my_device = is_my_device,
155 },
156};