/*
* Copyright (C) 2015-2016 Samsung Electronics
* Igor Kotrasinski <i.kotrasinsk@samsung.com>
* Krzysztof Opasiak <k.opasiak@samsung.com>
*
* Refactored from usbip_host_driver.c, which is:
* Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
* 2005-2007 Takahiro Hirofuchi
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <libudev.h>
#include "usbip_common.h"
#include "usbip_host_common.h"
#include "list.h"
#include "sysfs_utils.h"
struct udev *udev_context;
static int32_t read_attr_usbip_status(struct usbip_usb_device *udev)
{
char status_attr_path[SYSFS_PATH_MAX];
int size;
int fd;
int length;
char status;
int value = 0;
size = snprintf(status_attr_path, sizeof(status_attr_path),
"%s/usbip_status", udev->path);
if (size < 0 || (unsigned int)size >= sizeof(status_attr_path)) {
err("usbip_status path length %i >= %lu or < 0", size,
(long unsigned)sizeof(status_attr_path));
return -1;
}
fd = open(status_attr_path, O_RDONLY);
if (fd < 0) {
err("error opening attribute %s", status_attr_path);
return -1;
}
length = read(fd, &status, 1);
if (length < 0) {
err("error reading attribute %s", status_attr_path);
close(fd);
return -1;
}
value = atoi(&status);
return value;
}
static
struct usbip_exported_device *usbip_exported_device_new(
struct usbip_host_driver *hdriver, const char *sdevpath)
{
struct usbip_exported_device *edev = NULL;
struct usbip_exported_device *edev_old;
size_t size;
int i;
edev = calloc(1, sizeof(struct usbip_exported_device));
edev->sudev =
udev_device_new_from_syspath(udev_context, sdevpath);
if (!edev->sudev) {
err("udev_device_new_from_syspath: %s", sdevpath);
goto err;
}
if (hdriver->ops.read_device(edev->sudev, &edev->udev) < 0)
goto err;
edev->status = read_attr_usbip_status(&edev->udev);
if (edev->status < 0)
goto err;
/* reallocate buffer to include usb interface data */
size = sizeof(struct usbip_exported_device) +
edev->udev.bNumInterfaces * sizeof(struct usbip_usb_interface);
edev_old = edev;
edev = realloc(edev, size);
if (!edev) {
edev = edev_old;
dbg("realloc failed");
goto err;
}
for (i = 0; i < edev->udev.bNumInterfaces; i++) {
/* vudc does not support reading interfaces */
if (!hdriver->ops.read_interface)
break;
hdriver->ops.read_interface(&edev->udev, i, &edev->uinf[i]);
}
return edev;
err:
if (edev->sudev)
udev_device_unref(edev->sudev);
if (edev)
free(edev);
return NULL;
}
static int refresh_exported_devices(struct usbip_host_driver *hdriver)
{
struct usbip_exported_device *edev;
struct udev_enumerate *enumerate;
struct udev_list_entry *devices, *dev_list_entry;
struct udev_device *dev;
const char *path;
enumerate = udev_enumerate_new(udev_context);
udev_enumerate_add_match_subsystem(enumerate, hdriver->udev_subsystem);
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
udev_list_entry_foreach(dev_list_entry, devices) {
path = udev_list_entry_get_name(dev_list_entry);
dev = udev_device_new_from_syspath(udev_context,
path);
if (dev == NULL)
continue;
/* Check whether device uses usbip driver. */
if (hdriver->ops.is_my_device(dev)) {
edev = usbip_exported_device_new(hdriver, path);
if (!edev) {
dbg("usbip_exported_device_new failed");
continue;
}
list_add(&edev->node, &hdriver->edev_list);
hdriver->ndevs++;
}
}
return 0;
}
static void usbip_exported_device_destroy(struct list_head *devs)
{
struct list_head *i, *tmp;
struct usbip_exported_device *edev;
list_for_each_safe(i, tmp, devs) {
edev = list_entry(i, struct usbip_exported_device, node);
list_del(i);
free(edev);
}
}
int usbip_generic_driver_open(struct usbip_host_driver *hdriver)
{
int rc;
udev_context = udev_new();
if (!udev_context) {
err("udev_new failed");
return -1;
}
rc = refresh_exported_devices(hdriver);
if (rc < 0)
goto err;
return 0;
err:
udev_unref(udev_context);
return -1;
}
void usbip_generic_driver_close(struct usbip_host_driver *hdriver)
{
if (!hdriver)
return;
usbip_exported_device_destroy(&hdriver->edev_list);
udev_unref(udev_context);
}
int usbip_generic_refresh_device_list(struct usbip_host_driver *hdriver)
{
int rc;
usbip_exported_device_destroy(&hdriver->edev_list);
hdriver->ndevs = 0;
INIT_LIST_HEAD(&hdriver->edev_list);
rc = refresh_exported_devices(hdriver);
if (rc < 0)
return -1;
return 0;
}
int usbip_export_device(struct usbip_exported_device *edev, int sockfd)
{
char attr_name[] = "usbip_sockfd";
char sockfd_attr_path[SYSFS_PATH_MAX];
int size;
char sockfd_buff[30];
int ret;
if (edev->status != SDEV_ST_AVAILABLE) {
dbg("device not available: %s", edev->udev.busid);
switch (edev->status) {
case SDEV_ST_ERROR:
dbg("status SDEV_ST_ERROR");
break;
case SDEV_ST_USED:
dbg("status SDEV_ST_USED");
break;
default:
dbg("status unknown: 0x%x", edev->status);
}
return -1;
}
/* only the first interface is true */
size = snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s",
edev->udev.path, attr_name);
if (size < 0 || (unsigned int)size >= sizeof(sockfd_attr_path)) {
err("exported device path length %i >= %lu or < 0", size,
(long unsigned)sizeof(sockfd_attr_path));
return -1;
}
size = snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd);
if (size < 0 || (unsigned int)size >= sizeof(sockfd_buff)) {
err("socket length %i >= %lu or < 0", size,
(long unsigned)sizeof(sockfd_buff));
return -1;
}
ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff,
strlen(sockfd_buff));
if (ret < 0) {
err("write_sysfs_attribute failed: sockfd %s to %s",
sockfd_buff, sockfd_attr_path);
return ret;
}
info("connect: %s", edev->udev.busid);
return ret;
}
struct usbip_exported_device *usbip_generic_get_device(
struct usbip_host_driver *hdriver, int num)
{
struct list_head *i;
struct usbip_exported_device *edev;
int cnt = 0;
list_for_each(i, &hdriver->edev_list) {
edev = list_entry(i, struct usbip_exported_device, node);
if (num == cnt)
return edev;
cnt++;
}
return NULL;
}
