2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20 #include <linux/slab.h>
22 #include "usbip_common.h"
25 /* Version Information */
26 #define DRIVER_VERSION "1.0"
27 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
28 #define DRIVER_DESC "Stub Driver for USB/IP"
30 /* stub_priv is allocated from stub_priv_cache */
31 struct kmem_cache *stub_priv_cache;
33 /*-------------------------------------------------------------------------*/
35 /* Define sysfs entries for the usbip driver */
39 * busid_tables defines matching busids that usbip can grab. A user can change
40 * dynamically what device is locally used and what device is exported to a
45 static char busid_table[MAX_BUSID][BUSID_SIZE];
46 static spinlock_t busid_table_lock;
49 int match_busid(const char *busid)
53 spin_lock(&busid_table_lock);
55 for (i = 0; i < MAX_BUSID; i++)
56 if (busid_table[i][0])
57 if (!strncmp(busid_table[i], busid, BUSID_SIZE)) {
58 /* already registerd */
59 spin_unlock(&busid_table_lock);
63 spin_unlock(&busid_table_lock);
68 static ssize_t show_match_busid(struct device_driver *drv, char *buf)
73 spin_lock(&busid_table_lock);
75 for (i = 0; i < MAX_BUSID; i++)
76 if (busid_table[i][0])
77 out += sprintf(out, "%s ", busid_table[i]);
79 spin_unlock(&busid_table_lock);
81 out += sprintf(out, "\n");
86 static int add_match_busid(char *busid)
90 if (!match_busid(busid))
93 spin_lock(&busid_table_lock);
95 for (i = 0; i < MAX_BUSID; i++)
96 if (!busid_table[i][0]) {
97 strncpy(busid_table[i], busid, BUSID_SIZE);
98 spin_unlock(&busid_table_lock);
102 spin_unlock(&busid_table_lock);
107 static int del_match_busid(char *busid)
111 spin_lock(&busid_table_lock);
113 for (i = 0; i < MAX_BUSID; i++)
114 if (!strncmp(busid_table[i], busid, BUSID_SIZE)) {
116 memset(busid_table[i], 0, BUSID_SIZE);
117 spin_unlock(&busid_table_lock);
121 spin_unlock(&busid_table_lock);
126 static ssize_t store_match_busid(struct device_driver *dev, const char *buf,
130 char busid[BUSID_SIZE];
135 /* strnlen() does not include \0 */
136 len = strnlen(buf + 4, BUSID_SIZE);
138 /* busid needs to include \0 termination */
139 if (!(len < BUSID_SIZE))
142 strncpy(busid, buf + 4, BUSID_SIZE);
145 if (!strncmp(buf, "add ", 4)) {
146 if (add_match_busid(busid) < 0)
149 usbip_udbg("add busid %s\n", busid);
152 } else if (!strncmp(buf, "del ", 4)) {
153 if (del_match_busid(busid) < 0)
156 usbip_udbg("del busid %s\n", busid);
163 static DRIVER_ATTR(match_busid, S_IRUSR|S_IWUSR, show_match_busid,
168 /*-------------------------------------------------------------------------*/
170 /* Cleanup functions used to free private data */
172 static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
174 struct stub_priv *priv, *tmp;
176 list_for_each_entry_safe(priv, tmp, listhead, list) {
177 list_del(&priv->list);
184 static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
187 struct stub_priv *priv;
189 spin_lock_irqsave(&sdev->priv_lock, flags);
191 priv = stub_priv_pop_from_listhead(&sdev->priv_init);
193 spin_unlock_irqrestore(&sdev->priv_lock, flags);
197 priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
199 spin_unlock_irqrestore(&sdev->priv_lock, flags);
203 priv = stub_priv_pop_from_listhead(&sdev->priv_free);
205 spin_unlock_irqrestore(&sdev->priv_lock, flags);
209 spin_unlock_irqrestore(&sdev->priv_lock, flags);
213 void stub_device_cleanup_urbs(struct stub_device *sdev)
215 struct stub_priv *priv;
217 usbip_udbg("free sdev %p\n", sdev);
219 while ((priv = stub_priv_pop(sdev))) {
220 struct urb *urb = priv->urb;
222 usbip_udbg(" free urb %p\n", urb);
225 kmem_cache_free(stub_priv_cache, priv);
227 if (urb->transfer_buffer != NULL)
228 kfree(urb->transfer_buffer);
230 if (urb->setup_packet != NULL)
231 kfree(urb->setup_packet);
238 /*-------------------------------------------------------------------------*/
240 static int __init usb_stub_init(void)
244 stub_priv_cache = kmem_cache_create("stub_priv",
245 sizeof(struct stub_priv), 0,
246 SLAB_HWCACHE_ALIGN, NULL);
248 if (!stub_priv_cache) {
249 printk(KERN_ERR KBUILD_MODNAME
250 ": create stub_priv_cache error\n");
254 ret = usb_register(&stub_driver);
256 printk(KERN_ERR KBUILD_MODNAME ": usb_register failed %d\n",
258 goto error_usb_register;
261 printk(KERN_INFO KBUILD_MODNAME ":"
262 DRIVER_DESC ":" DRIVER_VERSION "\n");
264 memset(busid_table, 0, sizeof(busid_table));
265 spin_lock_init(&busid_table_lock);
267 ret = driver_create_file(&stub_driver.drvwrap.driver,
268 &driver_attr_match_busid);
271 printk(KERN_ERR KBUILD_MODNAME ": create driver sysfs\n");
272 goto error_create_file;
277 usb_deregister(&stub_driver);
279 kmem_cache_destroy(stub_priv_cache);
283 static void __exit usb_stub_exit(void)
285 driver_remove_file(&stub_driver.drvwrap.driver,
286 &driver_attr_match_busid);
289 * deregister() calls stub_disconnect() for all devices. Device
290 * specific data is cleared in stub_disconnect().
292 usb_deregister(&stub_driver);
294 kmem_cache_destroy(stub_priv_cache);
297 module_init(usb_stub_init);
298 module_exit(usb_stub_exit);
300 MODULE_AUTHOR(DRIVER_AUTHOR);
301 MODULE_DESCRIPTION(DRIVER_DESC);
302 MODULE_LICENSE("GPL");