Semtech SX9310 SAR sensor has a debouncer filter: only when N
measurements are above/below the far/close threshold an event is
sent to the host.
By default the debouncer is set to 2 events for the close to far
transition and 1 event (no debounce) for far to close.
It is a balance speed of detection and false positive avoidance.
On some chromebooks, the debouncer is set to a larger number.
Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
---
drivers/iio/proximity/sx9310.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 1ed749190bff9..6f92cf18fac31 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -1219,8 +1219,8 @@ static const struct sx9310_reg_default *
sx9310_get_default_reg(struct device *dev, int idx,
struct sx9310_reg_default *reg_def)
{
+ u32 start = 0, raw = 0, pos = 0, depth = 0;
u32 combined[SX9310_NUM_CHANNELS];
- u32 start = 0, raw = 0, pos = 0;
unsigned long comb_mask = 0;
int ret, i, count;
const char *res;
@@ -1325,6 +1325,25 @@ sx9310_get_default_reg(struct device *dev, int idx,
reg_def->def |= FIELD_PREP(SX9310_REG_PROX_CTRL7_AVGPOSFILT_MASK,
pos);
break;
+ case SX9310_REG_PROX_CTRL10:
+ ret = device_property_read_u32(dev, "semtech,close-debouncer-depth", &depth);
+ if (ret)
+ raw = FIELD_GET(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK,
+ reg_def->def);
+ else
+ raw = ilog2(depth);
+ reg_def->def &= ~SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK;
+ reg_def->def |= FIELD_PREP(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, raw);
+
+ ret = device_property_read_u32(dev, "semtech,far-debouncer-depth", &depth);
+ if (ret)
+ raw = FIELD_GET(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK,
+ reg_def->def);
+ else
+ raw = ilog2(depth);
+ reg_def->def &= ~SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK;
+ reg_def->def |= FIELD_PREP(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, raw);
+ break;
}
return reg_def;
--
2.31.0.291.g576ba9dcdaf-goog
