iio: hi8435: avoid garbage event at first enable

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Currently, driver generates events for channels if new reading differs
from previous one. This "previous value" is initialized to zero, which
results into event if value is constant-one.

Fix that by initializing "previous value" by reading at event enable
time.

This provides reliable sequence for userspace:
- enable event,
- AFTER THAT read current value,
- AFTER THAT each event will correspond to change.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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Nikita Yushchenko 2017-05-19 17:48:00 +03:00 • committed by Jonathan Cameron

parent fa7662e1bd

commit ee19ac340c

1 changed files with 13 additions and 2 deletions

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drivers/iio/adc/hi8435.c

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