iio: add watermark logic to iio read and poll
authorJosselin Costanzi <josselin.costanzi@mobile-devices.fr>
Sun, 22 Mar 2015 18:33:38 +0000 (20:33 +0200)
committerJonathan Cameron <jic23@kernel.org>
Sun, 29 Mar 2015 15:17:09 +0000 (16:17 +0100)
commit37d3455672732b29a477732a94abfe95e199f0ce
treea2e4920bbecaec6f3773cbc5a7228d17283b7d21
parent9444a300c2be3ce6266462e3171ceb6636cc62e8
iio: add watermark logic to iio read and poll

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>
Documentation/ABI/testing/sysfs-bus-iio
drivers/iio/industrialio-buffer.c
drivers/iio/kfifo_buf.c
drivers/staging/iio/accel/sca3000_ring.c
include/linux/iio/buffer.h