Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2003-2008 Takahiro Hirofuchi |
| 3 | * |
| 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. |
| 8 | * |
| 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. |
| 13 | * |
| 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, |
| 17 | * USA. |
| 18 | */ |
| 19 | |
| 20 | |
| 21 | #include "usbip_common.h" |
| 22 | #include "stub.h" |
| 23 | |
| 24 | /* Version Information */ |
| 25 | #define DRIVER_VERSION "1.0" |
| 26 | #define DRIVER_AUTHOR "Takahiro Hirofuchi" |
| 27 | #define DRIVER_DESC "Stub Driver for USB/IP" |
| 28 | |
| 29 | /* stub_priv is allocated from stub_priv_cache */ |
| 30 | struct kmem_cache *stub_priv_cache; |
| 31 | |
| 32 | /*-------------------------------------------------------------------------*/ |
| 33 | |
| 34 | /* Define sysfs entries for the usbip driver */ |
| 35 | |
| 36 | |
| 37 | /* |
| 38 | * busid_tables defines matching busids that usbip can grab. A user can change |
| 39 | * dynamically what device is locally used and what device is exported to a |
| 40 | * remote host. |
| 41 | */ |
| 42 | #define MAX_BUSID 16 |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 43 | #define BUSID_SIZE 20 |
| 44 | static char busid_table[MAX_BUSID][BUSID_SIZE]; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 45 | static spinlock_t busid_table_lock; |
| 46 | |
| 47 | |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 48 | int match_busid(const char *busid) |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 49 | { |
| 50 | int i; |
| 51 | |
| 52 | spin_lock(&busid_table_lock); |
| 53 | |
| 54 | for (i = 0; i < MAX_BUSID; i++) |
| 55 | if (busid_table[i][0]) |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 56 | if (!strncmp(busid_table[i], busid, BUSID_SIZE)) { |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 57 | /* already registerd */ |
| 58 | spin_unlock(&busid_table_lock); |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | spin_unlock(&busid_table_lock); |
| 63 | |
| 64 | return 1; |
| 65 | } |
| 66 | |
| 67 | static ssize_t show_match_busid(struct device_driver *drv, char *buf) |
| 68 | { |
| 69 | int i; |
| 70 | char *out = buf; |
| 71 | |
| 72 | spin_lock(&busid_table_lock); |
| 73 | |
| 74 | for (i = 0; i < MAX_BUSID; i++) |
| 75 | if (busid_table[i][0]) |
| 76 | out += sprintf(out, "%s ", busid_table[i]); |
| 77 | |
| 78 | spin_unlock(&busid_table_lock); |
| 79 | |
| 80 | out += sprintf(out, "\n"); |
| 81 | |
| 82 | return out - buf; |
| 83 | } |
| 84 | |
| 85 | static int add_match_busid(char *busid) |
| 86 | { |
| 87 | int i; |
| 88 | |
| 89 | if (!match_busid(busid)) |
| 90 | return 0; |
| 91 | |
| 92 | spin_lock(&busid_table_lock); |
| 93 | |
| 94 | for (i = 0; i < MAX_BUSID; i++) |
| 95 | if (!busid_table[i][0]) { |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 96 | strncpy(busid_table[i], busid, BUSID_SIZE); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 97 | spin_unlock(&busid_table_lock); |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | spin_unlock(&busid_table_lock); |
| 102 | |
| 103 | return -1; |
| 104 | } |
| 105 | |
| 106 | static int del_match_busid(char *busid) |
| 107 | { |
| 108 | int i; |
| 109 | |
| 110 | spin_lock(&busid_table_lock); |
| 111 | |
| 112 | for (i = 0; i < MAX_BUSID; i++) |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 113 | if (!strncmp(busid_table[i], busid, BUSID_SIZE)) { |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 114 | /* found */ |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 115 | memset(busid_table[i], 0, BUSID_SIZE); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 116 | spin_unlock(&busid_table_lock); |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | spin_unlock(&busid_table_lock); |
| 121 | |
| 122 | return -1; |
| 123 | } |
| 124 | |
| 125 | static ssize_t store_match_busid(struct device_driver *dev, const char *buf, |
| 126 | size_t count) |
| 127 | { |
| 128 | int len; |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 129 | char busid[BUSID_SIZE]; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 130 | |
| 131 | if (count < 5) |
| 132 | return -EINVAL; |
| 133 | |
| 134 | /* strnlen() does not include \0 */ |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 135 | len = strnlen(buf + 4, BUSID_SIZE); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 136 | |
| 137 | /* busid needs to include \0 termination */ |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 138 | if (!(len < BUSID_SIZE)) |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 139 | return -EINVAL; |
| 140 | |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 141 | strncpy(busid, buf + 4, BUSID_SIZE); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 142 | |
| 143 | |
| 144 | if (!strncmp(buf, "add ", 4)) { |
| 145 | if (add_match_busid(busid) < 0) |
| 146 | return -ENOMEM; |
| 147 | else { |
| 148 | udbg("add busid %s\n", busid); |
| 149 | return count; |
| 150 | } |
| 151 | } else if (!strncmp(buf, "del ", 4)) { |
| 152 | if (del_match_busid(busid) < 0) |
| 153 | return -ENODEV; |
| 154 | else { |
| 155 | udbg("del busid %s\n", busid); |
| 156 | return count; |
| 157 | } |
| 158 | } else |
| 159 | return -EINVAL; |
| 160 | } |
| 161 | |
| 162 | static DRIVER_ATTR(match_busid, S_IRUSR|S_IWUSR, show_match_busid, |
| 163 | store_match_busid); |
| 164 | |
| 165 | |
| 166 | |
| 167 | /*-------------------------------------------------------------------------*/ |
| 168 | |
| 169 | /* Cleanup functions used to free private data */ |
| 170 | |
| 171 | static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead) |
| 172 | { |
| 173 | struct stub_priv *priv, *tmp; |
| 174 | |
| 175 | list_for_each_entry_safe(priv, tmp, listhead, list) { |
| 176 | list_del(&priv->list); |
| 177 | return priv; |
| 178 | } |
| 179 | |
| 180 | return NULL; |
| 181 | } |
| 182 | |
| 183 | static struct stub_priv *stub_priv_pop(struct stub_device *sdev) |
| 184 | { |
| 185 | unsigned long flags; |
| 186 | struct stub_priv *priv; |
| 187 | |
| 188 | spin_lock_irqsave(&sdev->priv_lock, flags); |
| 189 | |
| 190 | priv = stub_priv_pop_from_listhead(&sdev->priv_init); |
| 191 | if (priv) { |
| 192 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 193 | return priv; |
| 194 | } |
| 195 | |
| 196 | priv = stub_priv_pop_from_listhead(&sdev->priv_tx); |
| 197 | if (priv) { |
| 198 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 199 | return priv; |
| 200 | } |
| 201 | |
| 202 | priv = stub_priv_pop_from_listhead(&sdev->priv_free); |
| 203 | if (priv) { |
| 204 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 205 | return priv; |
| 206 | } |
| 207 | |
| 208 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 209 | return NULL; |
| 210 | } |
| 211 | |
| 212 | void stub_device_cleanup_urbs(struct stub_device *sdev) |
| 213 | { |
| 214 | struct stub_priv *priv; |
| 215 | |
| 216 | udbg("free sdev %p\n", sdev); |
| 217 | |
| 218 | while ((priv = stub_priv_pop(sdev))) { |
| 219 | struct urb *urb = priv->urb; |
| 220 | |
| 221 | udbg(" free urb %p\n", urb); |
| 222 | usb_kill_urb(urb); |
| 223 | |
| 224 | kmem_cache_free(stub_priv_cache, priv); |
| 225 | |
| 226 | if (urb->transfer_buffer != NULL) |
| 227 | kfree(urb->transfer_buffer); |
| 228 | |
| 229 | if (urb->setup_packet != NULL) |
| 230 | kfree(urb->setup_packet); |
| 231 | |
| 232 | usb_free_urb(urb); |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | |
| 237 | /*-------------------------------------------------------------------------*/ |
| 238 | |
| 239 | static int __init usb_stub_init(void) |
| 240 | { |
| 241 | int ret; |
| 242 | |
| 243 | stub_priv_cache = kmem_cache_create("stub_priv", |
| 244 | sizeof(struct stub_priv), 0, |
| 245 | SLAB_HWCACHE_ALIGN, NULL); |
| 246 | |
| 247 | if (!stub_priv_cache) { |
| 248 | printk(KERN_ERR KBUILD_MODNAME |
| 249 | ": create stub_priv_cache error\n"); |
| 250 | return -ENOMEM; |
| 251 | } |
| 252 | |
| 253 | ret = usb_register(&stub_driver); |
| 254 | if (ret) { |
| 255 | printk(KERN_ERR KBUILD_MODNAME ": usb_register failed %d\n", |
| 256 | ret); |
| 257 | goto error_usb_register; |
| 258 | } |
| 259 | |
| 260 | printk(KERN_INFO KBUILD_MODNAME ":" |
| 261 | DRIVER_DESC ":" DRIVER_VERSION "\n"); |
| 262 | |
| 263 | memset(busid_table, 0, sizeof(busid_table)); |
| 264 | spin_lock_init(&busid_table_lock); |
| 265 | |
| 266 | ret = driver_create_file(&stub_driver.drvwrap.driver, |
| 267 | &driver_attr_match_busid); |
| 268 | |
| 269 | if (ret) { |
| 270 | printk(KERN_ERR KBUILD_MODNAME ": create driver sysfs\n"); |
| 271 | goto error_create_file; |
| 272 | } |
| 273 | |
| 274 | return ret; |
| 275 | error_create_file: |
| 276 | usb_deregister(&stub_driver); |
| 277 | error_usb_register: |
| 278 | kmem_cache_destroy(stub_priv_cache); |
| 279 | return ret; |
| 280 | } |
| 281 | |
| 282 | static void __exit usb_stub_exit(void) |
| 283 | { |
| 284 | driver_remove_file(&stub_driver.drvwrap.driver, |
| 285 | &driver_attr_match_busid); |
| 286 | |
| 287 | /* |
| 288 | * deregister() calls stub_disconnect() for all devices. Device |
| 289 | * specific data is cleared in stub_disconnect(). |
| 290 | */ |
| 291 | usb_deregister(&stub_driver); |
| 292 | |
| 293 | kmem_cache_destroy(stub_priv_cache); |
| 294 | } |
| 295 | |
| 296 | module_init(usb_stub_init); |
| 297 | module_exit(usb_stub_exit); |
| 298 | |
| 299 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 300 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 301 | MODULE_LICENSE("GPL"); |