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");