Hi. This patch adds the openwire detection support for the ad4111 chip. The openwire detection is done in software and relies on comparing the results of two conversions on different channels. The openwire detection on ad4111 is triggered automatically when a single conversion is requested. Due to the way openwire detection works on ad4111, implementing openwire detection for continuous conversion mode is out of the scope of this series. Following discussion on V2, I have changed the event to be IIO_EV_TYPE_FAULT and added a direction called IIO_EV_DIR_OPENWIRE to signal the specific fault. The fault is level triggered (ie: the event will be sent as long as the fault persists). There's no event to signal that the fault has been "fixed", an absence of FAULT event means that the open wire condition is not detected. Thx, Guillaume. Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx> --- Changes in v3: - Rename IIO_EV_TYPE_OPENWIRE to IIO_EV_TYPE_FAULT and add IIO_EV_DIR_OPENWIRE. - Remove per channel open wire threshold configuration interface. - Link to v2: https://lore.kernel.org/r/20250109-ad4111_openwire-v2-0-0372c2dde0ce@xxxxxxxxxxxx Changes in v2: - Introduce IIO_EV_TYPE_OPENWIRE instead of misusing the IIO_EV_THRESH event. - Link to v1: https://lore.kernel.org/r/20241115-ad4111_openwire-v1-1-db97ac8bf250@xxxxxxxxxxxx --- Guillaume Ranquet (2): iio: introduce the FAULT event type iio: adc: ad7173: add openwire detection support for single conversions drivers/iio/adc/ad7173.c | 161 +++++++++++++++++++++++++++++++++++++++ drivers/iio/industrialio-event.c | 2 + include/uapi/linux/iio/types.h | 2 + tools/iio/iio_event_monitor.c | 4 + 4 files changed, 169 insertions(+) --- base-commit: c849f534b9ea4688304f80f4571af75931dda7c1 change-id: 20241115-ad4111_openwire-e55deba8297f prerequisite-message-id: <20241115-ad411x_calibration-v1-1-5f820dfb5c80@xxxxxxxxxxxx> prerequisite-patch-id: 26241903b8fee8c4243e73d11fb2872cd9f52a15 Best regards, -- Guillaume Ranquet <granquet@xxxxxxxxxxxx>
