iio: add watermark logic to iio read and poll

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Currently the IIO buffer blocking read only wait until at least one
data element is available.
This patch makes the reader sleep until enough data is collected before
returning to userspace. This should limit the read() calls count when
trying to get data in batches.

Co-author: Yannick Bedhomme <yannick.bedhomme@mobile-devices.fr>
Signed-off-by: Josselin Costanzi <josselin.costanzi@mobile-devices.fr>
[rebased and remove buffer timeout]
Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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Josselin Costanzi 2015-03-22 20:33:38 +02:00 • committed by Jonathan Cameron

parent 9444a300c2

commit 37d3455672

5 changed files with 131 additions and 27 deletions

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8

include/linux/iio/buffer.h

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