Add open drain support in order to share requested IRQ line between
st_lsm6dsx device and other peripherals
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@xxxxxx>
---
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
index 2a72acc6e049..e2737dc71b67 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -31,6 +31,8 @@
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
+#include <linux/platform_data/st_sensors_pdata.h>
+
#include "st_lsm6dsx.h"
#define ST_LSM6DSX_REG_FIFO_THL_ADDR 0x06
@@ -39,6 +41,8 @@
#define ST_LSM6DSX_REG_FIFO_DEC_GXL_ADDR 0x08
#define ST_LSM6DSX_REG_HLACTIVE_ADDR 0x12
#define ST_LSM6DSX_REG_HLACTIVE_MASK BIT(5)
+#define ST_LSM6DSX_REG_PP_OD_ADDR 0x12
+#define ST_LSM6DSX_REG_PP_OD_MASK BIT(4)
#define ST_LSM6DSX_REG_FIFO_MODE_ADDR 0x0a
#define ST_LSM6DSX_FIFO_MODE_MASK GENMASK(2, 0)
#define ST_LSM6DSX_FIFO_ODR_MASK GENMASK(6, 3)
@@ -417,6 +421,8 @@ static const struct iio_buffer_setup_ops st_lsm6dsx_buffer_ops = {
int st_lsm6dsx_fifo_setup(struct st_lsm6dsx_hw *hw)
{
+ struct device_node *np = hw->dev->of_node;
+ struct st_sensors_platform_data *pdata;
struct iio_buffer *buffer;
unsigned long irq_type;
bool irq_active_low;
@@ -444,6 +450,17 @@ int st_lsm6dsx_fifo_setup(struct st_lsm6dsx_hw *hw)
if (err < 0)
return err;
+ pdata = (struct st_sensors_platform_data *)hw->dev->platform_data;
+ if ((np && of_property_read_bool(np, "drive-open-drain")) ||
+ (pdata && pdata->open_drain)) {
+ err = st_lsm6dsx_write_with_mask(hw, ST_LSM6DSX_REG_PP_OD_ADDR,
+ ST_LSM6DSX_REG_PP_OD_MASK, 1);
+ if (err < 0)
+ return err;
+
+ irq_type |= IRQF_SHARED;
+ }
+
err = devm_request_threaded_irq(hw->dev, hw->irq,
st_lsm6dsx_handler_irq,
st_lsm6dsx_handler_thread,
--
2.13.1
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