Jonathan Cameron bc2e1126ec iio:trigger: Experimental kthread tight loop trigger (thread only) ... This patch is in response to that of Gregor Boirie <gregor.boirie@parrot.com> who proposed using a tight kthread within a device driver (be it with the support factored out into a helper library) in order to basically spin as fast as possible. It is meant as a talking point rather than a formal proposal of the code (though we are heading towards that I think). Also gives people some working code to mess around with. I proposed that this could be done with a trigger with a few constraints and this is the proof (be it ugly) of that. There are some constraints though, some of which we would want to relax if this were to move forward. * Will only run the thread part of the registered pollfunc. This is to avoid the overhead of jumping in and out of interrupt context. Is the overhead significant? Not certain but feels like it should be! * This limitation precludes any device that 'must' do some work in interrupt context. However, that is true of few if any drivers and I suspect that any that do will be restricted to using triggers they provide themselves. Usually we have a top half mainly to grab a timestamp as soon after the dataready type signal as possible. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Acked-by: Daniel Baluta <daniel.baluta@intel.com>		2016-06-03 13:18:44 +01:00
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iio-trig-hrtimer.c
iio-trig-interrupt.c
iio-trig-loop.c
iio-trig-sysfs.c
Kconfig
Makefile