• Kay Sievers's avatar
    [PATCH] USB: real nodes instead of usbfs · fbf82fd2
    Kay Sievers authored
    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: default avatarKay Sievers <kay.sievers@suse.de>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    fbf82fd2
usb.h 2.04 KB