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* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This 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 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <linux/string.h>
#include "usbip_common.h"
#include "stub.h"
#define DRIVER_AUTHOR "Takahiro Hirofuchi"
#define DRIVER_DESC "USB/IP Host Driver"
/* stub_priv is allocated from stub_priv_cache */
struct kmem_cache *stub_priv_cache;
/*
* busid_tables defines matching busids that usbip can grab. A user can change
* dynamically what device is locally used and what device is exported to a
* remote host.
*/
#define MAX_BUSID 16
static struct bus_id_priv busid_table[MAX_BUSID];
static spinlock_t busid_table_lock;
int match_busid(const char *busid)
{
int i;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (busid_table[i].name[0])
if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
/* already registerd */
spin_unlock(&busid_table_lock);
return 0;
}
spin_unlock(&busid_table_lock);
return 1;
}
struct bus_id_priv *get_busid_priv(const char *busid)
{
int i;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (busid_table[i].name[0])
if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
/* already registerd */
spin_unlock(&busid_table_lock);
return &(busid_table[i]);
}
spin_unlock(&busid_table_lock);
return NULL;
}
static ssize_t show_match_busid(struct device_driver *drv, char *buf)
{
int i;
char *out = buf;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (busid_table[i].name[0])
out += sprintf(out, "%s ", busid_table[i].name);
spin_unlock(&busid_table_lock);
out += sprintf(out, "\n");
return out - buf;
}
static int add_match_busid(char *busid)
{
int i;
if (!match_busid(busid))
return 0;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (!busid_table[i].name[0]) {
strncpy(busid_table[i].name, busid, BUSID_SIZE);
if ((busid_table[i].status != STUB_BUSID_ALLOC) &&
(busid_table[i].status != STUB_BUSID_REMOV))
busid_table[i].status = STUB_BUSID_ADDED;
spin_unlock(&busid_table_lock);
return 0;
}
spin_unlock(&busid_table_lock);
return -1;
}
int del_match_busid(char *busid)
{
int i;
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++)
if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
/* found */
if (busid_table[i].status == STUB_BUSID_OTHER)
memset(busid_table[i].name, 0, BUSID_SIZE);
if ((busid_table[i].status != STUB_BUSID_OTHER) &&
(busid_table[i].status != STUB_BUSID_ADDED)) {
busid_table[i].status = STUB_BUSID_REMOV;
}
spin_unlock(&busid_table_lock);
return 0;
}
spin_unlock(&busid_table_lock);
return -1;
}
static void init_busid_table(void)
{
int i;
for (i = 0; i < MAX_BUSID; i++) {
memset(busid_table[i].name, 0, BUSID_SIZE);
busid_table[i].status = STUB_BUSID_OTHER;
busid_table[i].interf_count = 0;
busid_table[i].sdev = NULL;
busid_table[i].shutdown_busid = 0;
}
spin_lock_init(&busid_table_lock);
}
static ssize_t store_match_busid(struct device_driver *dev, const char *buf,
size_t count)
{
int len;
char busid[BUSID_SIZE];
if (count < 5)
return -EINVAL;
/* strnlen() does not include \0 */
len = strnlen(buf + 4, BUSID_SIZE);
/* busid needs to include \0 termination */
if (!(len < BUSID_SIZE))
return -EINVAL;
strncpy(busid, buf + 4, BUSID_SIZE);
if (!strncmp(buf, "add ", 4)) {
if (add_match_busid(busid) < 0)
return -ENOMEM;
else {
pr_debug("add busid %s\n", busid);
return count;
}
} else if (!strncmp(buf, "del ", 4)) {
if (del_match_busid(busid) < 0)
return -ENODEV;
else {
pr_debug("del busid %s\n", busid);
return count;
}
} else
return -EINVAL;
}
static DRIVER_ATTR(match_busid, S_IRUSR|S_IWUSR, show_match_busid,
store_match_busid);
static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
{
struct stub_priv *priv, *tmp;
list_for_each_entry_safe(priv, tmp, listhead, list) {
list_del(&priv->list);
return priv;
}
return NULL;
}
static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
{
unsigned long flags;
struct stub_priv *priv;
spin_lock_irqsave(&sdev->priv_lock, flags);
priv = stub_priv_pop_from_listhead(&sdev->priv_init);
if (priv) {
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
if (priv) {
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
priv = stub_priv_pop_from_listhead(&sdev->priv_free);
if (priv) {
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return priv;
}
spin_unlock_irqrestore(&sdev->priv_lock, flags);
return NULL;
}
void stub_device_cleanup_urbs(struct stub_device *sdev)
{
struct stub_priv *priv;
dev_dbg(&sdev->udev->dev, "free sdev %p\n", sdev);
while ((priv = stub_priv_pop(sdev))) {
struct urb *urb = priv->urb;
dev_dbg(&sdev->udev->dev, "free urb %p\n", urb);
usb_kill_urb(urb);
kmem_cache_free(stub_priv_cache, priv);
kfree(urb->transfer_buffer);
kfree(urb->setup_packet);
usb_free_urb(urb);
}
}
static int __init usb_stub_init(void)
{
int ret;
stub_priv_cache = kmem_cache_create("stub_priv",
sizeof(struct stub_priv), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!stub_priv_cache) {
pr_err("create stub_priv_cache error\n");
return -ENOMEM;
}
ret = usb_register(&stub_driver);
if (ret) {
pr_err("usb_register failed %d\n", ret);
goto error_usb_register;
}
pr_info(DRIVER_DESC " " USBIP_VERSION "\n");
init_busid_table();
ret = driver_create_file(&stub_driver.drvwrap.driver,
&driver_attr_match_busid);
if (ret) {
pr_err("create driver sysfs\n");
goto error_create_file;
}
return ret;
error_create_file:
usb_deregister(&stub_driver);
error_usb_register:
kmem_cache_destroy(stub_priv_cache);
return ret;
}
static void __exit usb_stub_exit(void)
{
driver_remove_file(&stub_driver.drvwrap.driver,
&driver_attr_match_busid);
/*
* deregister() calls stub_disconnect() for all devices. Device
* specific data is cleared in stub_disconnect().
*/
usb_deregister(&stub_driver);
kmem_cache_destroy(stub_priv_cache);
}
module_init(usb_stub_init);
module_exit(usb_stub_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(USBIP_VERSION);
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