diff options
| author | Josselin Costanzi <josselin.costanzi@mobile-devices.fr> | 2015-03-22 20:33:38 +0200 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-03-29 16:17:09 +0100 |
| commit | 37d3455672732b29a477732a94abfe95e199f0ce (patch) | |
| tree | a2e4920bbecaec6f3773cbc5a7228d17283b7d21 /drivers/staging/iio/accel/sca3000_ring.c | |
| parent | 9444a300c2be3ce6266462e3171ceb6636cc62e8 (diff) | |
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>
Diffstat (limited to 'drivers/staging/iio/accel/sca3000_ring.c')
| -rw-r--r-- | drivers/staging/iio/accel/sca3000_ring.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/staging/iio/accel/sca3000_ring.c b/drivers/staging/iio/accel/sca3000_ring.c index f76a26885808..8589eade1057 100644 --- a/drivers/staging/iio/accel/sca3000_ring.c +++ b/drivers/staging/iio/accel/sca3000_ring.c @@ -129,9 +129,9 @@ error_ret: return ret ? ret : num_read; } -static bool sca3000_ring_buf_data_available(struct iio_buffer *r) +static size_t sca3000_ring_buf_data_available(struct iio_buffer *r) { - return r->stufftoread; + return r->stufftoread ? r->watermark : 0; } /** |