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Hi,
I am having problems getting a working udev rule to change the group for my touchscreen input device nodes. I need to do this as the nodes are currently only accessible to root, so using the python multitouch toolkit module called Kivy, I am only able to run the programs as root. I need to assign these device nodes to a different group so I can run Kivy apps as a regular user.
Following is what I have done:
1. Created a new group and added my user to it
# groupadd touch
# gpasswd -a USERNAME touch2. Located the correct device nodes from dmesg
......
[ 7.557793] input: eGalax Inc. USB TouchController as /devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.0/input/input13
[ 7.560424] hid-multitouch 0003:0EEF:7302.0001: input,hiddev0,hidraw2: USB HID v2.10 Pointer [eGalax Inc. USB TouchController] on usb-0000:00:13.0-1/input0
......
[ 8.743657] input: eGalaxTouch Virtual Device for Multi as /devices/virtual/input/input14
[ 8.744747] input: eGalaxTouch Virtual Device for Single as /devices/virtual/input/input153. Confirmed the current permissions and ownership of the nodes
$ ls -l /dev/input/
......
crw-r----- 1 root root 13, 77 Jan 22 09:22 event13
crw-r----- 1 root root 13, 78 Jan 22 09:22 event14
crw-r----- 1 root root 13, 79 Jan 22 09:22 event15
......4. Looked up device info for creating the udev rule
$ CLUE=input15
$ for DEVICE in $(find /sys ! -type l -iname "*${CLUE}*"); do ls -dl $DEVICE; udevadm info -a -p $DEVICE; done
......
looking at device '/devices/virtual/input/input15':
KERNEL=="input15"
SUBSYSTEM=="input"
DRIVER==""
ATTR{name}=="eGalaxTouch Virtual Device for Single"
ATTR{phys}==""
ATTR{uniq}==""
ATTR{properties}=="0"
$ CLUE=input14
$ for DEVICE in $(find /sys ! -type l -iname "*${CLUE}*"); do ls -dl $DEVICE; udevadm info -a -p $DEVICE; done
......
looking at device '/devices/virtual/input/input14':
KERNEL=="input14"
SUBSYSTEM=="input"
DRIVER==""
ATTR{name}=="eGalaxTouch Virtual Device for Multi"
ATTR{phys}==""
ATTR{uniq}==""
ATTR{properties}=="0"
$ CLUE=input13
$ for DEVICE in $(find /sys ! -type l -iname "*${CLUE}*"); do ls -dl $DEVICE; udevadm info -a -p $DEVICE; done
......
looking at device '/devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.0/input/input13':
KERNEL=="input13"
SUBSYSTEM=="input"
DRIVER==""
ATTR{name}=="eGalax Inc. USB TouchController"
ATTR{phys}=="usb-0000:00:13.0-1/input0"
ATTR{uniq}==""
ATTR{properties}=="2"
looking at parent device '/devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.0':
KERNELS=="5-1:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="usbhid"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="01"
ATTRS{bInterfaceClass}=="03"
ATTRS{bInterfaceSubClass}=="01"
ATTRS{bInterfaceProtocol}=="02"
ATTRS{supports_autosuspend}=="1"
looking at parent device '/devices/pci0000:00/0000:00:13.0/usb5/5-1':
KERNELS=="5-1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}=="eGalax Inc."
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="a0"
ATTRS{bMaxPower}=="100mA"
ATTRS{urbnum}=="1815"
ATTRS{idVendor}=="0eef"
ATTRS{idProduct}=="7302"
ATTRS{bcdDevice}=="1006"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="12"
ATTRS{busnum}=="5"
ATTRS{devnum}=="2"
ATTRS{devpath}=="1"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="0"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="eGalax Inc."
ATTRS{product}=="USB TouchController"
looking at parent device '/devices/pci0000:00/0000:00:13.0/usb5':
KERNELS=="usb5"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="49"
ATTRS{idVendor}=="1d6b"
ATTRS{idProduct}=="0001"
ATTRS{bcdDevice}=="0302"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="12"
ATTRS{busnum}=="5"
ATTRS{devnum}=="1"
ATTRS{devpath}=="0"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="5"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Linux 3.2.1-1-ARCH ohci_hcd"
ATTRS{product}=="OHCI Host Controller"
ATTRS{serial}=="0000:00:13.0"
ATTRS{authorized_default}=="1"
looking at parent device '/devices/pci0000:00/0000:00:13.0':
KERNELS=="0000:00:13.0"
SUBSYSTEMS=="pci"
DRIVERS=="ohci_hcd"
ATTRS{vendor}=="0x1002"
ATTRS{device}=="0x4397"
ATTRS{subsystem_vendor}=="0x1025"
ATTRS{subsystem_device}=="0x0577"
ATTRS{class}=="0x0c0310"
ATTRS{irq}=="18"
ATTRS{local_cpus}=="00000000,00000003"
ATTRS{local_cpulist}=="0-1"
ATTRS{numa_node}=="-1"
ATTRS{dma_mask_bits}=="32"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{broken_parity_status}=="0"
ATTRS{msi_bus}==""
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""5. Created the udev rule
# nano /etc/udev/rules.d/99-egalax.rules
# Assign eGalax input device nodes to touch group
ACTION!="add|change", GOTO="egalax_end"
SUBSYSTEMS=="usb", ATTRS{manufacturer}=="eGalax Inc.", ATTRS{product}=="USB TouchController", GROUP="touch"
SUBSYSTEM=="input", ATTR{name}=="eGalaxTouch Virtual Device for Multi", GROUP="touch"
SUBSYSTEM=="input", ATTR{name}=="eGalaxTouch Virtual Device for Single", GROUP="touch"
LABEL="egalax_end"6 Rebooted to no success
ls -l /dev/input/
......
crw-r----- 1 root touch 13, 77 Jan 22 09:22 event13
crw-r----- 1 root root 13, 78 Jan 22 09:22 event14
crw-r----- 1 root root 13, 79 Jan 22 09:22 event15
......As you can see, the group has been changed for /dev/input/event13
I actually do not need to change that one. I just added it to see if my rule was being parsed or not. I really need the group changed on /dev/input/event14 and /dev/input/event15
All help gratefully appreciated.
Cheers.
Last edited by Padfoot (2012-01-24 08:13:32)
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Hi Padfoot,
adding your version of 99-egalax.rules I got same result.
In order to configure correctly I have changed SUBSYSTEM in SUBSYSTEMS and ATTR in ATTRS on line 4 and line 5.
I hope this can help you to solve the problem.
Cheers
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Hi Padfoot,
adding your version of 99-egalax.rules I got same result.
In order to configure correctly I have changed SUBSYSTEM in SUBSYSTEMS and ATTR in ATTRS on line 4 and line 5.
I hope this can help you to solve the problem.Cheers
Ant, you are a champion. Just missing the S on the end of SUBSYSTEM and ATTR made all the difference.
Udev is now changing my touch device nodes to a new group.
Cheers.
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