[PATCH] USB: real nodes instead of usbfs

This patch introduces a /sys/class/usb_device/ class
where every connected usb-device will show up:

  tree /sys/class/usb_device/
  /sys/class/usb_device/
  |-- usb1.1
  |   |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.0/usb1
  |-- usb2.1
  |   |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.1/usb2
  ...

The presence of the "dev" file lets udev create real device nodes.
  kay@pim:~/src/linux-2.6> tree /dev/bus/usb/
  /dev/bus/usb/
  |-- 1
  |   `-- 1
  |-- 2
  |   `-- 1
  ...

udev rule:
  SUBSYSTEM="usb_device", PROGRAM="/sbin/usb_device %k", NAME="%c"
  (echo $1 | /bin/sed 's/usb\([0-9]*\)\.\([0-9]*\)/bus\/usb\/\1\/\2/')

This makes libusb pick up the real nodes instead of the mounted usbfs:
  export USB_DEVFS_PATH=/dev/bus/usb

Background:
  All this makes it possible to manage usb devices with udev instead of
  the devfs solution. We are currently working on a pam_console/resmgr
  replacement driven by udev and a pam-helper. It applies ACL's to device
  nodes, which is required for modern desktop functionalty like
  "Fast User Switching" or multiple local login support.

New patch with its own major. I've succesfully disabled usbfs and use real
nodes only on my box. With: "export USB_DEVFS_PATH=/dev/bus/usb" libusb picks
up the udev managed nodes instead of reading usbfs files.

This makes udev to provide symlinks for libusb to pick up:
  SUBSYSTEM="usb_device", PROGRAM="/sbin/usbdevice %k", SYMLINK="%c"

/sbin/usbdevice:
  #!/bin/sh
  echo $1 | /bin/sed 's/usbdev\([0-9]*\)\.\([0-9]*\)/bus\/usb\/\1\/\2/'

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 2cddd8a..bc966db 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);