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Semtech SAR sensor SX9324 is an evolution of the SX9310:
It has 4 phases that can be configured to capture and process data
from any of 3 CS pins and provide independent detection:
proximity, table proximity or body proximity.
Gather antenna data:
echo sx9324-dev3 > trigger/current_trigger
echo 1 > scan_elements/in_proximity0_en
echo 1 > buffer/enable
od -v -An --endian=big -t d2 -w2 /dev/iio\:device3
(at 10Hz, the default).
Trigger events:
Setting:
thresh_falling_period: 2 (events)
thresh_rising_period: 2 (events)
in_proximity0_thresh_either_value: 300
in_proximity0_thresh_either_hysteresis: 72
using iio_event_monitor /dev/iio\:deviceX, approaching my hand to the
antenna pad, I see:
...
Event: time: 1634763907532035297, type: proximity, channel: 0, evtype:
thresh, direction: falling
Event: time: 1634763910138104640, type: proximity, channel: 0, evtype:
thresh, direction: rising
...
Datasheet: https://edit.wpgdadawant.com/uploads/news_file/program/2019/30184/tech_files/program_30184_suggest_other_file.pdf
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220101203817.290512-4-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
4c18a890df