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authorKay Sievers <kay.sievers@vrfy.org>2005-07-30 19:05:53 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2005-09-08 19:22:29 -0400
commitfbf82fd2e1f4e679c60516d772d1862c941ca845 (patch)
tree85aee08e665076cf90251e705db13f03b136ce0a /include/linux/usb.h
parent22af8878d2d641c6b15fe39fe4de3c05b2c477f0 (diff)
[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>
Diffstat (limited to 'include/linux/usb.h')
-rw-r--r--include/linux/usb.h2
1 files changed, 2 insertions, 0 deletions
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 @@
5#include <linux/usb_ch9.h> 5#include <linux/usb_ch9.h>
6 6
7#define USB_MAJOR 180 7#define USB_MAJOR 180
8#define USB_DEVICE_MAJOR 189
8 9
9 10
10#ifdef __KERNEL__ 11#ifdef __KERNEL__
@@ -349,6 +350,7 @@ struct usb_device {
349 char *manufacturer; 350 char *manufacturer;
350 char *serial; /* static strings from the device */ 351 char *serial; /* static strings from the device */
351 struct list_head filelist; 352 struct list_head filelist;
353 struct class_device *class_dev;
352 struct dentry *usbfs_dentry; /* usbfs dentry entry for the device */ 354 struct dentry *usbfs_dentry; /* usbfs dentry entry for the device */
353 355
354 /* 356 /*