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radseed - a kernel module to use geiger counter interrupts for entropy Jack Carrozzo <firstname.lastname@example.org> This module handles interrupts from a parallel port, keeping basic stats and calling add_interrupt_randomness() on events. For compatibility, the following filesystem stubs are presented: - Number of events recorded: (wraps at unsigned long max) /proc/radevents /sys/kernel/radseed/events - Time of last recorded event: (in system jiffies) /proc/radlast /sys/kernel/radseed/last - Event trigger for testing: /sys/kernel/radseed/trigger Your geiger counter should present a TTL-compatible strobe to pin 10 (ACK) of the parallel port at each event. However, the trigger can be used to test functionality of monitoring scripts and so forth: root@kdev0 ~ # cat /sys/kernel/radseed/events 0 root@kdev0 ~ # cat /sys/kernel/radseed/trigger 1 root@kdev0 ~ # cat /sys/kernel/radseed/trigger 1 root@kdev0 ~ # cat /sys/kernel/radseed/trigger 1 root@kdev0 ~ # cat /sys/kernel/radseed/trigger 1 root@kdev0 ~ # cat /sys/kernel/radseed/events 4 root@kdev0 ~ # cat /sys/kernel/radseed/last 16316569 This is tested to work with the 3.10.x and 3.13.x vanilla trees. The code is by no means robust or complete, but simply an experiement to see if this is worthwhile. I aim to finish a USB interface to my geiger counters and implement that here as well. If you find this useful, let me know!