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 00000000000..c665d7f1ca9
--- /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");