iio: accel: kionix-kx022a: use scan struct for one-shot and trigger reads

The driver kept two separate staging areas that hold the same thing:
buffer[8], a DMA-aligned area used by the one-shot read in
kx022a_get_axis() and by the triggered handler, and the scan struct,
used by the FIFO flush path. Both are three __le16 channels plus room
for the timestamp.

Drop buffer and route the one-shot read and the triggered handler
through scan.channels, so the driver has a single staging area. Move the
IIO_DMA_MINALIGN alignment onto scan, since it now backs the regmap bulk
reads that buffer used to.

No functional change. get_axis() only runs via read_raw() under
iio_device_claim_direct(), so it cannot run while the triggered buffer is
active, and the triggered handler only runs while it is; the two never
touch scan concurrently, exactly as they previously shared buffer.

Signed-off-by: Gabriel Rondon <grondon@gmail.com>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions