> Can you try to elaborate more on how exactly this interface is supposed to > be used, what kind of the devices it is used for, the use case of the device > and so on. This patch is adding userspace ABI which we have to maintain > forever so we should try to give this proper review, which is not easy > without knowing what it actually is. > > - Lars
The device in question is an I/O expansion board (nt133) with 4 relay outputs and 16 digital inputs for a PLC like Substation Automation Platform (NovaTech OrionLXm). The I/O board expects the state (on or off) and the number of milliseconds the state of the relay should be changed (or 0 to change it indefinitely). The outputs would typically be wired to something like a circuit breaker which expects a momentary contact but could also be used for other purposes. For this device writing "1000" to out_waveform0_hightime_raw would close the relay contact for 1 second. Writing "1000" to out_waveform0_lowtime_raw would open the relay contact for 1 second then return it to the closed state. I have the driver supplying 0.001000 for out_waveform_scale which should mean the "scaled" time is in seconds. I was trying to mirror suggestions Jonathan Cameron had for pulse capture in this post: https://lkml.org/lkml/2014/2/15/64 -George _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
