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iio: core: Introduce CHANGE event type

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A step detector will generate an interrupt each time N step are detected.
A device that has such pedometer functionality is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf.

Introduce IIO_EV_TYPE_CHANGE event type for events that are generated
when the channel passes a threshold on the absolute change in value.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea
2015-01-11 21:10:11 +02:00
committed by Jonathan Cameron
parent d37f6836fa
commit 27be84236d
4 changed files with 20 additions and 4 deletions
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drivers/iio/industrialio-event.c
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@@ -198,6 +198,7 @@ static const char * const iio_ev_type_text[] = {
[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
[IIO_EV_TYPE_INSTANCE] = "instance",
[IIO_EV_TYPE_CHANGE] = "change",
};
static const char * const iio_ev_dir_text[] = {