Linux Device Drivers Development

add_trigger file

This is used to create a new sysfs trigger. You can create a new trigger by writing a positive value (which will be used as a trigger ID) into that file. It will create the new sysfs trigger, accessible at /sys/bus/iio/devices/triggerX, where X is the trigger number, for example:

 # echo 2 > add_trigger 

This will create a new sysfs trigger, accessible at /sys/bus/iio/devices/trigger2. If the trigger with the specified ID is already present in the system, an invalid argument message will be returned. The sysfs trigger name pattern is sysfstrig{ID}. The echo 2 > add_trigger command will create the trigger /sys/bus/iio/devices/trigger2, whose name is sysfstrig2:

 $ cat /sys/bus/iio/devices/trigger2/name
 sysfstrig2  

Each sysfs ...