7 files changed, 114 insertions, 14 deletions

diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile
index 9e8c377b8161..d5503cf0bf74 100644
--- a/drivers/usb/core/Makefile
+++ b/drivers/usb/core/Makefile
@@ -3,14 +3,14 @@
 #
 
 usbcore-objs    := usb.o hub.o hcd.o urb.o message.o \
-                        config.o file.o buffer.o sysfs.o
+                        config.o file.o buffer.o sysfs.o devio.o
 
 ifeq ($(CONFIG_PCI),y)
         usbcore-objs    += hcd-pci.o
 endif
 
 ifeq ($(CONFIG_USB_DEVICEFS),y)
-        usbcore-objs    += devio.o inode.o devices.o
+        usbcore-objs    += inode.o devices.o
 endif
 
 obj-$(CONFIG_USB)       += usbcore.o
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index f86bf1454e21..d12bc5e84a1a 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -43,6 +43,7 @@
 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/usbdevice_fs.h>
+#include <linux/cdev.h>
 #include <asm/uaccess.h>
 #include <asm/byteorder.h>
 #include <linux/moduleparam.h>
@@ -50,6 +51,10 @@
 #include "hcd.h"        /* for usbcore internals */
 #include "usb.h"
 
+#define USB_MAXBUS                      64
+#define USB_DEVICE_MAX                  USB_MAXBUS * 128
+static struct class *usb_device_class;
+
 struct async {
         struct list_head asynclist;
         struct dev_state *ps;
@@ -487,7 +492,7 @@ static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsig
  */
 static int usbdev_open(struct inode *inode, struct file *file)
 {
-        struct usb_device *dev;
+        struct usb_device *dev = NULL;
         struct dev_state *ps;
         int ret;
 
@@ -501,11 +506,16 @@ static int usbdev_open(struct inode *inode, struct file *file)
 
         lock_kernel();
         ret = -ENOENT;
-        dev = usb_get_dev(inode->u.generic_ip);
+        /* check if we are called from a real node or usbfs */
+        if (imajor(inode) == USB_DEVICE_MAJOR)
+                dev = usbdev_lookup_minor(iminor(inode));
+        if (!dev)
+                dev = inode->u.generic_ip;
         if (!dev) {
                 kfree(ps);
                 goto out;
         }
+        usb_get_dev(dev);
         ret = 0;
         ps->dev = dev;
         ps->file = file;
@@ -1477,3 +1487,80 @@ struct file_operations usbfs_device_file_operations = {
         .open =         usbdev_open,
         .release =      usbdev_release,
 };
+
+struct usb_device *usbdev_lookup_minor(int minor)
+{
+        struct class_device *class_dev;
+        struct usb_device *dev = NULL;
+
+        down(&usb_device_class->sem);
+        list_for_each_entry(class_dev, &usb_device_class->children, node) {
+                if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
+                        dev = class_dev->class_data;
+                        break;
+                }
+        }
+        up(&usb_device_class->sem);
+
+        return dev;
+};
+
+void usbdev_add(struct usb_device *dev)
+{
+        int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
+
+        dev->class_dev = class_device_create(usb_device_class,
+                                MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
+                                "usbdev%d.%d", dev->bus->busnum, dev->devnum);
+
+        dev->class_dev->class_data = dev;
+}
+
+void usbdev_remove(struct usb_device *dev)
+{
+        class_device_unregister(dev->class_dev);
+}
+
+static struct cdev usb_device_cdev = {
+        .kobj   = {.name = "usb_device", },
+        .owner  = THIS_MODULE,
+};
+
+int __init usbdev_init(void)
+{
+        int retval;
+
+        retval = register_chrdev_region(MKDEV(USB_DEVICE_MAJOR, 0),
+                                        USB_DEVICE_MAX, "usb_device");
+        if (retval) {
+                err("unable to register minors for usb_device");
+                goto out;
+        }
+        cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
+        retval = cdev_add(&usb_device_cdev,
+                          MKDEV(USB_DEVICE_MAJOR, 0), USB_DEVICE_MAX);
+        if (retval) {
+                err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
+                unregister_chrdev_region(USB_DEVICE_MAJOR, USB_DEVICE_MAX);
+                goto out;
+        }
+        usb_device_class = class_create(THIS_MODULE, "usb_device");
+        if (IS_ERR(usb_device_class)) {
+                err("unable to register usb_device class");
+                retval = PTR_ERR(usb_device_class);
+                usb_device_class = NULL;
+                cdev_del(&usb_device_cdev);
+                unregister_chrdev_region(USB_DEVICE_MAJOR, USB_DEVICE_MAX);
+        }
+
+out:
+        return retval;
+}
+
+void usbdev_cleanup(void)
+{
+        class_destroy(usb_device_class);
+        cdev_del(&usb_device_cdev);
+        unregister_chrdev_region(USB_DEVICE_MAJOR, USB_DEVICE_MAX);
+}
+
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c9412daff682..a220a5e7f4a5 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1051,6 +1051,7 @@ void usb_disconnect(struct usb_device **pdev)
         dev_dbg (&udev->dev, "unregistering device\n");
         release_address(udev);
         usbfs_remove_device(udev);
+        usbdev_remove(udev);
         usb_remove_sysfs_dev_files(udev);
 
         /* Avoid races with recursively_mark_NOTATTACHED() */
@@ -1290,6 +1291,7 @@ int usb_new_device(struct usb_device *udev)
         /* USB device state == configured ... usable */
 
         /* add a /proc/bus/usb entry */
+        usbdev_add(udev);
         usbfs_add_device(udev);
         return 0;
 
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index c3e3a95d3804..640f41e47029 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -728,15 +728,9 @@ int __init usbfs_init(void)
 {
         int retval;
 
-        retval = usb_register(&usbfs_driver);
-        if (retval)
-                return retval;
-
         retval = register_filesystem(&usb_fs_type);
-        if (retval) {
-                usb_deregister(&usbfs_driver);
+        if (retval)
                 return retval;
-        }
 
         /* create mount point for usbfs */
         usbdir = proc_mkdir("usb", proc_bus);
@@ -746,7 +740,6 @@ int __init usbfs_init(void)
 
 void usbfs_cleanup(void)
 {
-        usb_deregister(&usbfs_driver);
         unregister_filesystem(&usb_fs_type);
         if (usbdir)
                 remove_proc_entry("usb", proc_bus);
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 2cddd8a00437..bc966dbc6021 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -1478,13 +1478,18 @@ static int __init usb_init(void)
         retval = usb_major_init();
         if (retval)
                 goto major_init_failed;
+        retval = usb_register(&usbfs_driver);
+        if (retval)
+                goto driver_register_failed;
+        retval = usbdev_init();
+        if (retval)
+                goto usbdevice_init_failed;
         retval = usbfs_init();
         if (retval)
                 goto fs_init_failed;
         retval = usb_hub_init();
         if (retval)
                 goto hub_init_failed;
-
         retval = driver_register(&usb_generic_driver);
         if (!retval)
                 goto out;
@@ -1493,7 +1498,11 @@ static int __init usb_init(void)
 hub_init_failed:
         usbfs_cleanup();
 fs_init_failed:
-        usb_major_cleanup();    
+        usbdev_cleanup();
+usbdevice_init_failed:
+        usb_deregister(&usbfs_driver);
+driver_register_failed:
+        usb_major_cleanup();
 major_init_failed:
         usb_host_cleanup();
 host_init_failed:
@@ -1514,6 +1523,8 @@ static void __exit usb_exit(void)
         driver_unregister(&usb_generic_driver);
         usb_major_cleanup();
         usbfs_cleanup();
+        usb_deregister(&usbfs_driver);
+        usbdev_cleanup();
         usb_hub_cleanup();
         usb_host_cleanup();
         bus_unregister(&usb_bus_type);
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 2c690f6d4c18..83d48c8133af 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -37,6 +37,11 @@ extern struct file_operations usbfs_devices_fops;
 extern struct file_operations usbfs_device_file_operations;
 extern void usbfs_conn_disc_event(void);
 
+extern int usbdev_init(void);
+extern void usbdev_cleanup(void);
+extern void usbdev_add(struct usb_device *dev);
+extern void usbdev_remove(struct usb_device *dev);
+extern struct usb_device *usbdev_lookup_minor(int minor);
 
 struct dev_state {
         struct list_head list;      /* state list */
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 724637792996..434e35120c65 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -5,6 +5,7 @@
 #include <linux/usb_ch9.h>
 
 #define USB_MAJOR                       180
+#define USB_DEVICE_MAJOR                189
 
 
 #ifdef __KERNEL__
@@ -349,6 +350,7 @@ struct usb_device {
         char *manufacturer;
         char *serial;                   /* static strings from the device */
         struct list_head filelist;
+        struct class_device *class_dev;
         struct dentry *usbfs_dentry;    /* usbfs dentry entry for the device */
 
         /*