[PATCH V9 09/11] iio: imu: inv_icm42607: Add IRQ for icm42607

[Chris Morgan <macroalpha82@gmail.com>]

From: Chris Morgan <macromorgan@hotmail.com>

Add IRQ support for the icm42607 driver.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 .../iio/imu/inv_icm42607/inv_icm42607_core.c  | 97 ++++++++++++++++++-
 1 file changed, 96 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c b/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c
index 6b623fb679f3..3c91623dffb2 100644
--- a/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c
+++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c
@@ -331,6 +331,91 @@ static int inv_icm42607_setup(struct inv_icm42607_state *st,
 	return inv_icm42607_set_conf(st, st->hw->conf);
 }
 
+static irqreturn_t inv_icm42607_irq_timestamp(int irq, void *_data)
+{
+	struct inv_icm42607_state *st = _data;
+
+	st->timestamp.accel = iio_get_time_ns(st->indio_accel);
+
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t inv_icm42607_irq_handler(int irq, void *_data)
+{
+	struct inv_icm42607_state *st = _data;
+	struct device *dev = regmap_get_device(st->map);
+	unsigned int status;
+	int ret;
+
+	mutex_lock(&st->lock);
+
+	ret = regmap_read(st->map, INV_ICM42607_REG_INT_STATUS, &status);
+	if (ret) {
+		dev_err(dev, "Interrut status read error %d\n", ret);
+		goto out_unlock;
+	}
+
+	if (status & INV_ICM42607_INT_STATUS_FIFO_FULL)
+		dev_warn(dev, "FIFO full data lost!\n");
+
+	if (status & INV_ICM42607_INT_STATUS_FIFO_THS) {
+		mutex_unlock(&st->lock);
+		ret = inv_icm42607_buffer_fifo_read(st, 0);
+		if (ret) {
+			dev_err(dev, "FIFO read error %d\n", ret);
+			goto out_unlock;
+		}
+
+		mutex_lock(&st->lock);
+		ret = inv_icm42607_buffer_fifo_parse(st);
+		if (ret)
+			dev_err(dev, "FIFO parsing error %d\n", ret);
+	}
+
+out_unlock:
+	mutex_unlock(&st->lock);
+	return IRQ_HANDLED;
+}
+
+static int inv_icm42607_irq_init(struct inv_icm42607_state *st, int irq,
+				 int irq_type, bool open_drain)
+{
+	struct device *dev = regmap_get_device(st->map);
+	unsigned int val = 0;
+	int ret;
+
+	switch (irq_type) {
+	case IRQF_TRIGGER_RISING:
+	case IRQF_TRIGGER_HIGH:
+		val = INV_ICM42607_INT_CONFIG_INT1_ACTIVE_HIGH;
+		break;
+	default:
+		val = INV_ICM42607_INT_CONFIG_INT1_ACTIVE_LOW;
+		break;
+	}
+
+	switch (irq_type) {
+	case IRQF_TRIGGER_LOW:
+	case IRQF_TRIGGER_HIGH:
+		val |= INV_ICM42607_INT_CONFIG_INT1_LATCHED;
+		break;
+	default:
+		break;
+	}
+
+	if (!open_drain)
+		val |= INV_ICM42607_INT_CONFIG_INT1_PUSH_PULL;
+
+	ret = regmap_write(st->map, INV_ICM42607_REG_INT_CONFIG, val);
+	if (ret)
+		return ret;
+
+	irq_type |= IRQF_ONESHOT;
+	return devm_request_threaded_irq(dev, irq, inv_icm42607_irq_timestamp,
+					 inv_icm42607_irq_handler, irq_type,
+					 st->hw->name, st);
+}
+
 static int inv_icm42607_enable_vddio_reg(struct inv_icm42607_state *st)
 {
 	int ret;
@@ -367,13 +452,18 @@ int inv_icm42607_core_probe(struct regmap *regmap,
 {
 	struct device *dev = regmap_get_device(regmap);
 	struct inv_icm42607_state *st;
-	int irq;
+	int irq, irq_type;
+	bool open_drain;
 	int ret;
 
 	irq = fwnode_irq_get_byname(dev_fwnode(dev), "INT1");
 	if (irq < 0)
 		return dev_err_probe(dev, irq, "Unable to get INT1 interrupt\n");
 
+	irq_type = irq_get_trigger_type(irq);
+
+	open_drain = device_property_read_bool(dev, "drive-open-drain");
+
 	st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
 	if (!st)
 		return -ENOMEM;
@@ -433,6 +523,11 @@ int inv_icm42607_core_probe(struct regmap *regmap,
 	if (IS_ERR(st->indio_accel))
 		return PTR_ERR(st->indio_accel);
 
+	/* Initialize interrupt handling */
+	ret = inv_icm42607_irq_init(st, irq, irq_type, open_drain);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 EXPORT_SYMBOL_NS_GPL(inv_icm42607_core_probe, "IIO_ICM42607");
-- 
2.43.0