How to link a device to udev?

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I have a microcontroller with a few "strange" devices.



One of these is an embedded Ethernet switch.



Cable connections and disconnections are captured by driver which dutifully prints a log message:



[ 260.740000] rt305x-esw 10110000.esw: link changed 0x01
[ 2542.440000] rt305x-esw 10110000.esw: link changed 0x00
[ 2544.390000] rt305x-esw 10110000.esw: link changed 0x01


The driver also registers in sysfs:



# ls -l /sys/devices/10110000.esw/
total 0
lrwxrwxrwx 1 root root 0 Jan 1 01:05 driver -> ../../bus/platform/drivers/rt305x-esw
-rw-r--r-- 1 root root 4096 Jan 1 01:05 driver_override
-r--r--r-- 1 root root 4096 Jan 1 01:05 modalias
lrwxrwxrwx 1 root root 0 Jan 1 01:05 subsystem -> ../../bus/platform
-rw-r--r-- 1 root root 4096 Jan 1 01:00 uevent


but its uevent is rather cryptic to me:



# cat /sys/devices/10110000.esw/uevent 
DRIVER=rt305x-esw
OF_NAME=esw
OF_FULLNAME=/esw@10110000
OF_COMPATIBLE_0=ralink,rt3050-esw
OF_COMPATIBLE_N=1
MODALIAS=of:NeswT<NULL>Cralink,rt3050-esw


Now the question:



I should connect a uevent rule to "link changed" events; how can I do that?



I was unable to find any (relevant) documentation; can someone point me in the right direction, please?




linux udev sysfs




share|improve this question




















  • First see if the driver is sending out a event to udev when the status change. Do sudo udevadm monitor -k -p to print the events as they occur.
    – meuh
    Oct 15 '17 at 15:07














up vote
0
down vote

favorite












I have a microcontroller with a few "strange" devices.



One of these is an embedded Ethernet switch.



Cable connections and disconnections are captured by driver which dutifully prints a log message:



[ 260.740000] rt305x-esw 10110000.esw: link changed 0x01
[ 2542.440000] rt305x-esw 10110000.esw: link changed 0x00
[ 2544.390000] rt305x-esw 10110000.esw: link changed 0x01


The driver also registers in sysfs:



# ls -l /sys/devices/10110000.esw/
total 0
lrwxrwxrwx 1 root root 0 Jan 1 01:05 driver -> ../../bus/platform/drivers/rt305x-esw
-rw-r--r-- 1 root root 4096 Jan 1 01:05 driver_override
-r--r--r-- 1 root root 4096 Jan 1 01:05 modalias
lrwxrwxrwx 1 root root 0 Jan 1 01:05 subsystem -> ../../bus/platform
-rw-r--r-- 1 root root 4096 Jan 1 01:00 uevent


but its uevent is rather cryptic to me:



# cat /sys/devices/10110000.esw/uevent 
DRIVER=rt305x-esw
OF_NAME=esw
OF_FULLNAME=/esw@10110000
OF_COMPATIBLE_0=ralink,rt3050-esw
OF_COMPATIBLE_N=1
MODALIAS=of:NeswT<NULL>Cralink,rt3050-esw


Now the question:



I should connect a uevent rule to "link changed" events; how can I do that?



I was unable to find any (relevant) documentation; can someone point me in the right direction, please?




linux udev sysfs




share|improve this question




















  • First see if the driver is sending out a event to udev when the status change. Do sudo udevadm monitor -k -p to print the events as they occur.
    – meuh
    Oct 15 '17 at 15:07












up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have a microcontroller with a few "strange" devices.



One of these is an embedded Ethernet switch.



Cable connections and disconnections are captured by driver which dutifully prints a log message:



[ 260.740000] rt305x-esw 10110000.esw: link changed 0x01
[ 2542.440000] rt305x-esw 10110000.esw: link changed 0x00
[ 2544.390000] rt305x-esw 10110000.esw: link changed 0x01


The driver also registers in sysfs:



# ls -l /sys/devices/10110000.esw/
total 0
lrwxrwxrwx 1 root root 0 Jan 1 01:05 driver -> ../../bus/platform/drivers/rt305x-esw
-rw-r--r-- 1 root root 4096 Jan 1 01:05 driver_override
-r--r--r-- 1 root root 4096 Jan 1 01:05 modalias
lrwxrwxrwx 1 root root 0 Jan 1 01:05 subsystem -> ../../bus/platform
-rw-r--r-- 1 root root 4096 Jan 1 01:00 uevent


but its uevent is rather cryptic to me:



# cat /sys/devices/10110000.esw/uevent 
DRIVER=rt305x-esw
OF_NAME=esw
OF_FULLNAME=/esw@10110000
OF_COMPATIBLE_0=ralink,rt3050-esw
OF_COMPATIBLE_N=1
MODALIAS=of:NeswT<NULL>Cralink,rt3050-esw


Now the question:



I should connect a uevent rule to "link changed" events; how can I do that?



I was unable to find any (relevant) documentation; can someone point me in the right direction, please?




linux udev sysfs




share|improve this question












I have a microcontroller with a few "strange" devices.



One of these is an embedded Ethernet switch.



Cable connections and disconnections are captured by driver which dutifully prints a log message:



[ 260.740000] rt305x-esw 10110000.esw: link changed 0x01
[ 2542.440000] rt305x-esw 10110000.esw: link changed 0x00
[ 2544.390000] rt305x-esw 10110000.esw: link changed 0x01


The driver also registers in sysfs:



# ls -l /sys/devices/10110000.esw/
total 0
lrwxrwxrwx 1 root root 0 Jan 1 01:05 driver -> ../../bus/platform/drivers/rt305x-esw
-rw-r--r-- 1 root root 4096 Jan 1 01:05 driver_override
-r--r--r-- 1 root root 4096 Jan 1 01:05 modalias
lrwxrwxrwx 1 root root 0 Jan 1 01:05 subsystem -> ../../bus/platform
-rw-r--r-- 1 root root 4096 Jan 1 01:00 uevent


but its uevent is rather cryptic to me:



# cat /sys/devices/10110000.esw/uevent 
DRIVER=rt305x-esw
OF_NAME=esw
OF_FULLNAME=/esw@10110000
OF_COMPATIBLE_0=ralink,rt3050-esw
OF_COMPATIBLE_N=1
MODALIAS=of:NeswT<NULL>Cralink,rt3050-esw


Now the question:



I should connect a uevent rule to "link changed" events; how can I do that?



I was unable to find any (relevant) documentation; can someone point me in the right direction, please?





linux udev sysfs





share|improve this question











share|improve this question




share|improve this question










asked Oct 14 '17 at 17:06









ZioByte

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17117











  • First see if the driver is sending out a event to udev when the status change. Do sudo udevadm monitor -k -p to print the events as they occur.
    – meuh
    Oct 15 '17 at 15:07
















  • First see if the driver is sending out a event to udev when the status change. Do sudo udevadm monitor -k -p to print the events as they occur.
    – meuh
    Oct 15 '17 at 15:07















First see if the driver is sending out a event to udev when the status change. Do sudo udevadm monitor -k -p to print the events as they occur.
– meuh
Oct 15 '17 at 15:07




First see if the driver is sending out a event to udev when the status change. Do sudo udevadm monitor -k -p to print the events as they occur.
– meuh
Oct 15 '17 at 15:07















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