diff options
author | Takahiro Hirofuchi <hirofuchi@users.sourceforge.net> | 2008-07-09 14:56:51 -0600 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-10-10 15:31:09 -0700 |
commit | 4d7b5c7f8ad49b7f01fb8aed83c560ac43cfbda8 (patch) | |
tree | b9a643d4dd14f7048356b21fcb136293efff5b54 /drivers/staging/usbip/stub_main.c | |
parent | 04679b3489e048cd5dae79e050a3afed8e4e42b6 (diff) |
Staging: USB/IP: add host driver
This adds the USB IP client driver
Brian Merrell cleaned up a lot of this code and submitted it for
inclusion. Greg also did a lot of cleanup.
Signed-off-by: Brian G. Merrell <bgmerrell@novell.com>
Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/usbip/stub_main.c')
-rw-r--r-- | drivers/staging/usbip/stub_main.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/drivers/staging/usbip/stub_main.c b/drivers/staging/usbip/stub_main.c new file mode 100644 index 000000000000..c665d7f1ca9a --- /dev/null +++ b/drivers/staging/usbip/stub_main.c @@ -0,0 +1,300 @@ +/* + * 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 "usbip_common.h" +#include "stub.h" + +/* Version Information */ +#define DRIVER_VERSION "1.0" +#define DRIVER_AUTHOR "Takahiro Hirofuchi" +#define DRIVER_DESC "Stub Driver for USB/IP" + +/* stub_priv is allocated from stub_priv_cache */ +struct kmem_cache *stub_priv_cache; + +/*-------------------------------------------------------------------------*/ + +/* Define sysfs entries for the usbip driver */ + + +/* + * 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 char busid_table[MAX_BUSID][BUS_ID_SIZE]; +static spinlock_t busid_table_lock; + + +int match_busid(char *busid) +{ + int i; + + spin_lock(&busid_table_lock); + + for (i = 0; i < MAX_BUSID; i++) + if (busid_table[i][0]) + if (!strncmp(busid_table[i], busid, BUS_ID_SIZE)) { + /* already registerd */ + spin_unlock(&busid_table_lock); + return 0; + } + + spin_unlock(&busid_table_lock); + + return 1; +} + +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][0]) + out += sprintf(out, "%s ", busid_table[i]); + + 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][0]) { + strncpy(busid_table[i], busid, BUS_ID_SIZE); + spin_unlock(&busid_table_lock); + return 0; + } + + spin_unlock(&busid_table_lock); + + return -1; +} + +static 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], busid, BUS_ID_SIZE)) { + /* found */ + memset(busid_table[i], 0, BUS_ID_SIZE); + spin_unlock(&busid_table_lock); + return 0; + } + + spin_unlock(&busid_table_lock); + + return -1; +} + +static ssize_t store_match_busid(struct device_driver *dev, const char *buf, + size_t count) +{ + int len; + char busid[BUS_ID_SIZE]; + + if (count < 5) + return -EINVAL; + + /* strnlen() does not include \0 */ + len = strnlen(buf + 4, BUS_ID_SIZE); + + /* busid needs to include \0 termination */ + if (!(len < BUS_ID_SIZE)) + return -EINVAL; + + strncpy(busid, buf + 4, BUS_ID_SIZE); + + + if (!strncmp(buf, "add ", 4)) { + if (add_match_busid(busid) < 0) + return -ENOMEM; + else { + udbg("add busid %s\n", busid); + return count; + } + } else if (!strncmp(buf, "del ", 4)) { + if (del_match_busid(busid) < 0) + return -ENODEV; + else { + udbg("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); + + + +/*-------------------------------------------------------------------------*/ + +/* Cleanup functions used to free private data */ + +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; + + udbg("free sdev %p\n", sdev); + + while ((priv = stub_priv_pop(sdev))) { + struct urb *urb = priv->urb; + + udbg(" free urb %p\n", urb); + usb_kill_urb(urb); + + kmem_cache_free(stub_priv_cache, priv); + + if (urb->transfer_buffer != NULL) + kfree(urb->transfer_buffer); + + if (urb->setup_packet != NULL) + 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) { + printk(KERN_ERR KBUILD_MODNAME + ": create stub_priv_cache error\n"); + return -ENOMEM; + } + + ret = usb_register(&stub_driver); + if (ret) { + printk(KERN_ERR KBUILD_MODNAME ": usb_register failed %d\n", + ret); + goto error_usb_register; + } + + printk(KERN_INFO KBUILD_MODNAME ":" + DRIVER_DESC ":" DRIVER_VERSION "\n"); + + memset(busid_table, 0, sizeof(busid_table)); + spin_lock_init(&busid_table_lock); + + ret = driver_create_file(&stub_driver.drvwrap.driver, + &driver_attr_match_busid); + + if (ret) { + printk(KERN_ERR KBUILD_MODNAME ": 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"); |