#1680: /proc/bus/usb is obsolete --------------------------------------------+------------------------------- Reporter: [EMAIL PROTECTED] | Owner: [email protected] Type: defect | Status: new Priority: high | Milestone: future Component: BOOK | Version: a-SVN Severity: normal | Resolution: Keywords: | --------------------------------------------+------------------------------- Old description:
> While the instructions at the libusb page still work with linux-2.6.14, > they > describe the obsolete setup. The /proc/bus/usb mount should go away, and > libusb > should be patched to take advantage of real raw usb device nodes. Use > this raw > message as a patch for libusb: > > http://marc.theaimsgroup.com/?l=linux-hotplug- > devel&m=112447064921992&q=raw > > The udev rule that is equivalent to the current setup WRT permissions is: > > SUBSYSTEM=="usb_device", PROGRAM="/bin/sh -c 'X=%k X=$${X#usbdev} > B=$${X%%%%.*} > D=$${X#*.}; echo bus/usb/$$B/$$D'", SYMLINK+="%c", GROUP="usb" > > (that is one long line) > > Fine-tunuing of permissions is possible by creating extra rules, matching > on > something like this: > > SUBSYSTEM=="usb_device", SYSFS{idVendor}=="05d8", > SYSFS{idProduct}=="4002", > GROUP:="scanner" New description: While the instructions at the libusb page still work with linux-2.6.14, they describe the obsolete setup. The /proc/bus/usb mount should go away, and libusb should be patched to take advantage of real raw usb device nodes. Use this raw message as a patch for libusb: http://marc.theaimsgroup.com/?l=linux-hotplug- devel&m=112447064921992&q=raw The udev rule that is equivalent to the current setup WRT permissions is: SUBSYSTEM=="usb_device", PROGRAM="/bin/sh -c 'X=%k X=$${X#usbdev} B=$${X%%%%.*} D=$${X#*.}; echo bus/usb/$$B/$$D'", SYMLINK+="%c", GROUP="usb" (that is one long line) Fine-tunuing of permissions is possible by creating extra rules, matching on something like this: SUBSYSTEM=="usb_device", SYSFS{idVendor}=="05d8", SYSFS{idProduct}=="4002", GROUP:="scanner" Comment (by [EMAIL PROTECTED]): LFS should integrate the udev rule above. The patch is no longer needed with libusb-0.1.12. This version of libusb first tries /dev/bus/usb (where udev creates real device nodes with the above rule) and then falls back to /proc/bus/usb (should not happen with linux >= 2.6.14 with proper udev rules, because /dev/bus/usb is always available). Thus, if all applications requiring raw access to USB devices used libusb, one could remove the /proc/bus/usb mount. Unfortunately, VMware and other proprietary apps beyond BLFS may still need this obsolete mount point because they don't use libusb. /dev/bus/usb and /proc/bus/usb don't conflict. It's just that udev can't be used to set /proc/bus/usb permissions reliably. -- Ticket URL: <http://wiki.linuxfromscratch.org/blfs/ticket/1680> BLFS Trac <http://wiki.linuxfromscratch.org/blfs> Beyond Linux From Scratch -- http://linuxfromscratch.org/mailman/listinfo/blfs-book FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
