linux/drivers/staging/iio/Documentation/sysfs-bus-iio-trigger-sysfs
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   1What:           /sys/bus/iio/devices/triggerX/trigger_now
   2KernelVersion:  2.6.38
   3Contact:        linux-iio@vger.kernel.org
   4Description:
   5                This file is provided by the iio-trig-sysfs stand-alone trigger
   6                driver. Writing this file with any value triggers an event
   7                driven driver, associated with this trigger, to capture data
   8                into an in kernel buffer. This approach can be valuable during
   9                automated testing or in situations, where other trigger methods
  10                are not applicable. For example no RTC or spare GPIOs.
  11                X is the IIO index of the trigger.
  12