[PATCH 9/9] iio: imu: st_lsm6dsx: add tap event detection

[Francesco Lavra <flavra@baylibre.com>]

Add the logic to advertise tap event capability and report tap
events; define a tap event source for the LSM6DSV chip family.
Tested on LSMDSV16X.

Signed-off-by: Francesco Lavra <flavra@baylibre.com>
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h      |  1 +
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 35 ++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
index 62edd177c87c..75953a78fc04 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
@@ -223,6 +223,7 @@ struct st_lsm6dsx_shub_settings {
 
 enum st_lsm6dsx_event_id {
 	ST_LSM6DSX_EVENT_WAKEUP,
+	ST_LSM6DSX_EVENT_TAP,
 	ST_LSM6DSX_EVENT_MAX
 };
 
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index 6d1b7b2a371a..1bc69c6c1b9d 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -1349,6 +1349,30 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 					.status_y_mask = BIT(1),
 					.status_x_mask = BIT(2),
 				},
+				[ST_LSM6DSX_EVENT_TAP] = {
+					.x_value = {
+						.addr = 0x57,
+						.mask = GENMASK(4, 0),
+					},
+					.y_value = {
+						.addr = 0x58,
+						.mask = GENMASK(4, 0),
+					},
+					.z_value = {
+						.addr = 0x59,
+						.mask = GENMASK(4, 0),
+					},
+					.enable_mask = BIT(6),
+					.enable_axis_reg = 0x56,
+					.enable_x_mask = BIT(3),
+					.enable_y_mask = BIT(2),
+					.enable_z_mask = BIT(1),
+					.status_reg = 0x46,
+					.status_mask = BIT(5),
+					.status_x_mask = BIT(2),
+					.status_y_mask = BIT(1),
+					.status_z_mask = BIT(0),
+				},
 			},
 		},
 	},
@@ -1846,6 +1870,8 @@ static enum st_lsm6dsx_event_id st_lsm6dsx_get_event_id(enum iio_event_type type
 	switch (type) {
 	case IIO_EV_TYPE_THRESH:
 		return ST_LSM6DSX_EVENT_WAKEUP;
+	case IIO_EV_TYPE_GESTURE:
+		return ST_LSM6DSX_EVENT_TAP;
 	default:
 		return ST_LSM6DSX_EVENT_MAX;
 	}
@@ -2427,6 +2453,13 @@ static int st_lsm6dsx_chan_init(struct iio_chan_spec *channels, struct st_lsm6ds
 				event_spec->dir = IIO_EV_DIR_EITHER;
 				event_spec->mask_separate = BIT(IIO_EV_INFO_VALUE) |
 							    BIT(IIO_EV_INFO_ENABLE);
+				event_spec++;
+			}
+			if (event_sources & BIT(ST_LSM6DSX_EVENT_TAP)) {
+				event_spec->type = IIO_EV_TYPE_GESTURE;
+				event_spec->dir = IIO_EV_DIR_SINGLETAP;
+				event_spec->mask_separate = BIT(IIO_EV_INFO_VALUE) |
+							    BIT(IIO_EV_INFO_ENABLE);
 			}
 		}
 	}
@@ -2553,6 +2586,8 @@ st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw)
 
 	events_found = st_lsm6dsx_report_events(hw, ST_LSM6DSX_EVENT_WAKEUP, IIO_EV_TYPE_THRESH,
 						IIO_EV_DIR_EITHER);
+	events_found |= st_lsm6dsx_report_events(hw, ST_LSM6DSX_EVENT_TAP, IIO_EV_TYPE_GESTURE,
+						 IIO_EV_DIR_SINGLETAP);
 
 	return events_found;
 }
-- 
2.39.5