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};