Commit 9251f7aa authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Jonathan Cameron
Browse files

iio: humidity: hts221: support open drain mode 



Add open drain support in order to share requested IRQ line between
hts221 device and other peripherals

Signed-off-by: default avatarLorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 8614206a

drivers/iio/humidity/hts221_buffer.c

+21 −1
Original line number Diff line number Diff line
@@ -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,