Add open drain support in order to share requested IRQ line between
hts221 device and other peripherals
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@xxxxxx>
---
drivers/iio/humidity/hts221_buffer.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/humidity/hts221_buffer.c b/drivers/iio/humidity/hts221_buffer.c
index ad5222295b2c..f29f01a22375 100644
--- a/drivers/iio/humidity/hts221_buffer.c
+++ b/drivers/iio/humidity/hts221_buffer.c
@@ -20,10 +20,14 @@
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/buffer.h>
+#include <linux/platform_data/st_sensors_pdata.h>
+
#include "hts221.h"
#define HTS221_REG_DRDY_HL_ADDR 0x22
#define HTS221_REG_DRDY_HL_MASK BIT(7)
+#define HTS221_REG_DRDY_PP_OD_ADDR 0x22
+#define HTS221_REG_DRDY_PP_OD_MASK BIT(6)
#define HTS221_REG_STATUS_ADDR 0x27
#define HTS221_RH_DRDY_MASK BIT(1)
#define HTS221_TEMP_DRDY_MASK BIT(0)
@@ -69,7 +73,9 @@ static irqreturn_t hts221_trigger_handler_thread(int irq, void *private)
int hts221_allocate_trigger(struct hts221_hw *hw)
{
struct iio_dev *iio_dev = iio_priv_to_dev(hw);
- bool irq_active_low = false;
+ bool irq_active_low = false, open_drain = false;
+ struct device_node *np = hw->dev->of_node;
+ struct st_sensors_platform_data *pdata;
unsigned long irq_type;
int err;
@@ -95,6 +101,20 @@ int hts221_allocate_trigger(struct hts221_hw *hw)
HTS221_REG_DRDY_HL_MASK, irq_active_low);
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)) {
+ irq_type |= IRQF_SHARED;
+ open_drain = true;
+ }
+
+ err = hts221_write_with_mask(hw, HTS221_REG_DRDY_PP_OD_ADDR,
+ HTS221_REG_DRDY_PP_OD_MASK,
+ open_drain);
+ if (err < 0)
+ return err;
+
err = devm_request_threaded_irq(hw->dev, hw->irq, NULL,
hts221_trigger_handler_thread,
irq_type | IRQF_ONESHOT,
--
2.13.2
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