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>
diff --git a/drivers/staging/usbip/stub_main.c b/drivers/staging/usbip/stub_main.c
new file mode 100644
index 0000000..c665d7f
--- /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");