udev rule to match and remove invalid joystick

Chais · 2015-02-09 18:32:29

Hi everyone,

so I have a dongle for my mouse/keyboard, which also advertises as a joystick. Since this prevents me from using the real gamepads I want to get rid of it.
The following devices are created for the hardware:

/dev/input/event3   (keyboard)
/dev/input/mouse0   (mouse)
/dev/input/event4   (mouse)
/dev/input/js0      (invalid joystick)
/dev/input/event5   (invalid joystick)

These are my current udev rules:

ACTION=="add", KERNEL=="js[0-9]*", SUBSYSTEM=="input", KERNELS=="3-3:1.2", ATTRS{bInterfaceSubClass}=="00", ATTRS{bInterfaceProtocol}=="00", ATTRS{bInterfaceNumber}=="02", RUN+="/usr/bin/rm /dev/input/js%n"
ACTION=="add", KERNEL=="event*", SUBSYSTEM=="input", KERNELS=="3-3:1.2", ATTRS{bInterfaceSubClass}=="00", ATTRS{bInterfaceProtocol}=="00", ATTRS{bInterfaceNumber}=="02", RUN+="/usr/bin/rm /dev/input/event%n"

These used to work, but then started preventing me from using the keyboad's media keys, so I had to fiddle around again. Now they don't work for some reason. Please don't ask me why. udev is a huge lump of voodoo to me
I toyed around with rules like this:

ACTION=="add", KERNEL=="js[0-9]*", SUBSYSTEM=="input", KERNEL=="0003:045E:0745.0006", RUN+="/usr/bin/rm /dev/input/js%n"

But the last part of the second KERNEL test changes every time the device is replugged.
Also I seem to have no way of checking which rules are applied to the device, as `udevadm test` doesn't seem to show it.
And so that you don't have to guess, here's the attribute walk of /deV/input/js0:

  looking at device '/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.2/0003:045E:0745.0009/input/input29/js0':
    KERNEL=="js0"
    SUBSYSTEM=="input"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.2/0003:045E:0745.0009/input/input29':
    KERNELS=="input29"
    SUBSYSTEMS=="input"
    DRIVERS==""
    ATTRS{phys}=="usb-0000:00:14.0-3/input2"
    ATTRS{uniq}==""
    ATTRS{properties}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.2/0003:045E:0745.0009':
    KERNELS=="0003:045E:0745.0009"
    SUBSYSTEMS=="hid"
    DRIVERS=="hid-generic"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.2':
    KERNELS=="1-3:1.2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bInterfaceSubClass}=="00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="02"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1/1-3':
    KERNELS=="1-3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="3"
    ATTRS{idVendor}=="045e"
    ATTRS{speed}=="12"
    ATTRS{bNumInterfaces}==" 3"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="6"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="100mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="a0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0656"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="20015"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Microsoft"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0745"
    ATTRS{bDeviceClass}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="12"
    ATTRS{bcdDevice}=="0318"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="0000:00:14.0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="122"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 3.18.5-1-ARCH xhci-hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="xHCI Host Controller"

  looking at parent device '/devices/pci0000:00/0000:00:14.0':
    KERNELS=="0000:00:14.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="xhci_hcd"
    ATTRS{irq}=="28"
    ATTRS{subsystem_vendor}=="0x1462"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x0c0330"
    ATTRS{driver_override}=="(null)"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{local_cpus}=="00000000,00000000,00000000,0000000f"
    ATTRS{device}=="0x8c31"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}=="1"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x7850"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

I hope someone can help get this done. I'd like to be able to use both, the media keys, and the gamepads.

Chais

ThecaTTony · 2015-05-01 07:41:29

Hi, first thanks and second i have good news.

As you may have noticed KERNELS parameter usually changes and thus the rule does not apply, but the path /dev/input/by-id don't change, so:

Create a udev rule:

## /etc/udev/rules.d/99-fix-jsx-eventx.rules ##
SUBSYSTEM=="input", ATTRS{idVendor}=="045e", ATTRS{idProduct}=="0745", KERNEL=="js[0-9]*", RUN+="/usr/local/bin/fix-jsx-eventx.sh"

Then create the script to change permissions:

## /usr/local/bin/fix-jsx-eventx.sh ##
#!/bin/bash
sleep 5
chmod a-r-w "/dev/input/by-id/usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v7.0-if02-event-joystick"
chmod a-r-w "/dev/input/by-id/usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v7.0-if02-joystick"

The "sleep 5" is necessary because the eventX is not immediately created, making that permissions aren't applied correctly.

# chmod +x /usr/local/bin/fix-jsx-eventx.sh

After that, reload rules

# udevadm control --reload

Then replug the device and voilà! Both problems solved, get rid of fake joystick and working multimedia keys.

Bye!"

PD: Google translated...

Last edited by ThecaTTony (2015-05-01 07:43:00)

Arch Linux

#1 2015-02-09 18:32:29

udev rule to match and remove invalid joystick

#2 2015-05-01 07:41:29

Re: udev rule to match and remove invalid joystick

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