[PATCH v3 4/6] iio: sx9310: Support setting debounce values

[Stephen Boyd <swboyd@xxxxxxxxxxxx>]

The rising and falling directions can be debounced in the hardware as
"close" and "far" debounce settings. Add support for these as rising and
falling debounce settings.

Cc: Daniel Campello <campello@xxxxxxxxxxxx>
Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
Cc: Peter Meerwald-Stadler <pmeerw@xxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
Cc: Evan Green <evgreen@xxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
---
 drivers/iio/proximity/sx9310.c | 100 +++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 9eb10e8263e7..3f909177eca9 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -77,6 +77,8 @@
 #define SX9310_REG_PROX_CTRL10				0x1a
 #define   SX9310_REG_PROX_CTRL10_HYST_MASK		GENMASK(5, 4)
 #define   SX9310_REG_PROX_CTRL10_HYST_6PCT		(0x01 << 4)
+#define   SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK	GENMASK(3, 2)
+#define   SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK	GENMASK(1, 0)
 #define   SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_2		0x01
 #define SX9310_REG_PROX_CTRL11				0x1b
 #define SX9310_REG_PROX_CTRL12				0x1c
@@ -147,6 +149,16 @@ struct sx9310_data {
 };
 
 static const struct iio_event_spec sx9310_events[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
+	},
 	{
 		.type = IIO_EV_TYPE_THRESH,
 		.dir = IIO_EV_DIR_EITHER,
@@ -601,6 +613,42 @@ static int sx9310_read_hysteresis(struct sx9310_data *data,
 	return IIO_VAL_INT;
 }
 
+static int sx9310_read_far_debounce(struct sx9310_data *data, int *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL10, &regval);
+	if (ret)
+		return ret;
+
+	regval = FIELD_GET(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, regval);
+	if (regval)
+		*val = 1 << regval;
+	else
+		*val = 0;
+
+	return IIO_VAL_INT;
+}
+
+static int sx9310_read_close_debounce(struct sx9310_data *data, int *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL10, &regval);
+	if (ret)
+		return ret;
+
+	regval = FIELD_GET(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, regval);
+	if (regval)
+		*val = 1 << regval;
+	else
+		*val = 0;
+
+	return IIO_VAL_INT;
+}
+
 static int sx9310_read_event_val(struct iio_dev *indio_dev,
 				 const struct iio_chan_spec *chan,
 				 enum iio_event_type type,
@@ -615,6 +663,15 @@ static int sx9310_read_event_val(struct iio_dev *indio_dev,
 	switch (info) {
 	case IIO_EV_INFO_VALUE:
 		return sx9310_read_thresh(data, chan, val);
+	case IIO_EV_INFO_PERIOD:
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			return sx9310_read_far_debounce(data, val);
+		case IIO_EV_DIR_FALLING:
+			return sx9310_read_close_debounce(data, val);
+		default:
+			return -EINVAL;
+		}
 	case IIO_EV_INFO_HYSTERESIS:
 		return sx9310_read_hysteresis(data, chan, val);
 	default:
@@ -682,6 +739,40 @@ static int sx9310_write_hysteresis(struct sx9310_data *data,
 	return ret;
 }
 
+static int sx9310_write_far_debounce(struct sx9310_data *data, int val)
+{
+	int ret;
+	unsigned int regval;
+
+	val = ilog2(val);
+	regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, val);
+
+	mutex_lock(&data->mutex);
+	ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10,
+				 SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK,
+				 regval);
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static int sx9310_write_close_debounce(struct sx9310_data *data, int val)
+{
+	int ret;
+	unsigned int regval;
+
+	val = ilog2(val);
+	regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, val);
+
+	mutex_lock(&data->mutex);
+	ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10,
+				 SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK,
+				 regval);
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
 static int sx9310_write_event_val(struct iio_dev *indio_dev,
 				  const struct iio_chan_spec *chan,
 				  enum iio_event_type type,
@@ -696,6 +787,15 @@ static int sx9310_write_event_val(struct iio_dev *indio_dev,
 	switch (info) {
 	case IIO_EV_INFO_VALUE:
 		return sx9310_write_thresh(data, chan, val);
+	case IIO_EV_INFO_PERIOD:
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			return sx9310_write_far_debounce(data, val);
+		case IIO_EV_DIR_FALLING:
+			return sx9310_write_close_debounce(data, val);
+		default:
+			return -EINVAL;
+		}
 	case IIO_EV_INFO_HYSTERESIS:
 		return sx9310_write_hysteresis(data, chan, val);
 	default:
-- 
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