iio: srf04: add power management feature

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Add suspend and resume operations for being used by optional power
management.

The suspend function is switching off an GPIO which can be used by the
hardware to switch power off. The resume function is switching the GPIO
on and sleeps an adjustable time to give the device a chance to be up
and running.

If activated the driver gets into autosuspend after some time of
inactivity.

Suggested-by: Franz Parzer <rpi-receiver@htl-steyr.ac.at>
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Andreas Klinger 2020-01-20 17:45:41 +01:00 • committed by Jonathan Cameron

parent 66053d5d1b

commit 2251157b33

1 changed files with 95 additions and 1 deletions

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drivers/iio/proximity/srf04.c

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