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/string.h>
22 #include "usbip_common.h"
25 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
26 #define DRIVER_DESC "USB/IP Host Driver"
28 struct kmem_cache
*stub_priv_cache
;
30 * busid_tables defines matching busids that usbip can grab. A user can change
31 * dynamically what device is locally used and what device is exported to a
35 static struct bus_id_priv busid_table
[MAX_BUSID
];
36 static spinlock_t busid_table_lock
;
38 static void init_busid_table(void)
42 memset(busid_table
, 0, sizeof(busid_table
));
43 for (i
= 0; i
< MAX_BUSID
; i
++)
44 busid_table
[i
].status
= STUB_BUSID_OTHER
;
46 spin_lock_init(&busid_table_lock
);
50 * Find the index of the busid by name.
51 * Must be called with busid_table_lock held.
53 static int get_busid_idx(const char *busid
)
58 for (i
= 0; i
< MAX_BUSID
; i
++)
59 if (busid_table
[i
].name
[0])
60 if (!strncmp(busid_table
[i
].name
, busid
, BUSID_SIZE
)) {
67 struct bus_id_priv
*get_busid_priv(const char *busid
)
70 struct bus_id_priv
*bid
= NULL
;
72 spin_lock(&busid_table_lock
);
73 idx
= get_busid_idx(busid
);
75 bid
= &(busid_table
[idx
]);
76 spin_unlock(&busid_table_lock
);
81 static int add_match_busid(char *busid
)
86 spin_lock(&busid_table_lock
);
87 /* already registered? */
88 if (get_busid_idx(busid
) >= 0) {
93 for (i
= 0; i
< MAX_BUSID
; i
++)
94 if (!busid_table
[i
].name
[0]) {
95 strncpy(busid_table
[i
].name
, busid
, BUSID_SIZE
);
96 if ((busid_table
[i
].status
!= STUB_BUSID_ALLOC
) &&
97 (busid_table
[i
].status
!= STUB_BUSID_REMOV
))
98 busid_table
[i
].status
= STUB_BUSID_ADDED
;
104 spin_unlock(&busid_table_lock
);
109 int del_match_busid(char *busid
)
114 spin_lock(&busid_table_lock
);
115 idx
= get_busid_idx(busid
);
122 if (busid_table
[idx
].status
== STUB_BUSID_OTHER
)
123 memset(busid_table
[idx
].name
, 0, BUSID_SIZE
);
125 if ((busid_table
[idx
].status
!= STUB_BUSID_OTHER
) &&
126 (busid_table
[idx
].status
!= STUB_BUSID_ADDED
))
127 busid_table
[idx
].status
= STUB_BUSID_REMOV
;
130 spin_unlock(&busid_table_lock
);
135 static ssize_t
show_match_busid(struct device_driver
*drv
, char *buf
)
140 spin_lock(&busid_table_lock
);
141 for (i
= 0; i
< MAX_BUSID
; i
++)
142 if (busid_table
[i
].name
[0])
143 out
+= sprintf(out
, "%s ", busid_table
[i
].name
);
144 spin_unlock(&busid_table_lock
);
145 out
+= sprintf(out
, "\n");
150 static ssize_t
store_match_busid(struct device_driver
*dev
, const char *buf
,
154 char busid
[BUSID_SIZE
];
159 /* strnlen() does not include \0 */
160 len
= strnlen(buf
+ 4, BUSID_SIZE
);
162 /* busid needs to include \0 termination */
163 if (!(len
< BUSID_SIZE
))
166 strncpy(busid
, buf
+ 4, BUSID_SIZE
);
168 if (!strncmp(buf
, "add ", 4)) {
169 if (add_match_busid(busid
) < 0) {
172 pr_debug("add busid %s\n", busid
);
175 } else if (!strncmp(buf
, "del ", 4)) {
176 if (del_match_busid(busid
) < 0) {
179 pr_debug("del busid %s\n", busid
);
186 static DRIVER_ATTR(match_busid
, S_IRUSR
| S_IWUSR
, show_match_busid
,
189 static struct stub_priv
*stub_priv_pop_from_listhead(struct list_head
*listhead
)
191 struct stub_priv
*priv
, *tmp
;
193 list_for_each_entry_safe(priv
, tmp
, listhead
, list
) {
194 list_del(&priv
->list
);
201 static struct stub_priv
*stub_priv_pop(struct stub_device
*sdev
)
204 struct stub_priv
*priv
;
206 spin_lock_irqsave(&sdev
->priv_lock
, flags
);
208 priv
= stub_priv_pop_from_listhead(&sdev
->priv_init
);
212 priv
= stub_priv_pop_from_listhead(&sdev
->priv_tx
);
216 priv
= stub_priv_pop_from_listhead(&sdev
->priv_free
);
219 spin_unlock_irqrestore(&sdev
->priv_lock
, flags
);
224 void stub_device_cleanup_urbs(struct stub_device
*sdev
)
226 struct stub_priv
*priv
;
229 dev_dbg(&sdev
->udev
->dev
, "free sdev %p\n", sdev
);
231 while ((priv
= stub_priv_pop(sdev
))) {
233 dev_dbg(&sdev
->udev
->dev
, "free urb %p\n", urb
);
236 kmem_cache_free(stub_priv_cache
, priv
);
238 kfree(urb
->transfer_buffer
);
239 kfree(urb
->setup_packet
);
244 static int __init
usbip_host_init(void)
248 stub_priv_cache
= KMEM_CACHE(stub_priv
, SLAB_HWCACHE_ALIGN
);
250 if (!stub_priv_cache
) {
251 pr_err("kmem_cache_create failed\n");
255 ret
= usb_register(&stub_driver
);
257 pr_err("usb_register failed %d\n", ret
);
258 goto err_usb_register
;
261 ret
= driver_create_file(&stub_driver
.drvwrap
.driver
,
262 &driver_attr_match_busid
);
264 pr_err("driver_create_file failed\n");
265 goto err_create_file
;
269 pr_info(DRIVER_DESC
" v" USBIP_VERSION
"\n");
273 usb_deregister(&stub_driver
);
275 kmem_cache_destroy(stub_priv_cache
);
279 static void __exit
usbip_host_exit(void)
281 driver_remove_file(&stub_driver
.drvwrap
.driver
,
282 &driver_attr_match_busid
);
285 * deregister() calls stub_disconnect() for all devices. Device
286 * specific data is cleared in stub_disconnect().
288 usb_deregister(&stub_driver
);
290 kmem_cache_destroy(stub_priv_cache
);
293 module_init(usbip_host_init
);
294 module_exit(usbip_host_exit
);
296 MODULE_AUTHOR(DRIVER_AUTHOR
);
297 MODULE_DESCRIPTION(DRIVER_DESC
);
298 MODULE_LICENSE("GPL");
299 MODULE_VERSION(USBIP_VERSION
);