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iio: humidity: hts221: support active-low interrupts 

Add support for active low interrupts (IRQF_TRIGGER_LOW and
IRQF_TRIGGER_FALLING). Configure the device as active high or low
according to the requested irq line.

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.1
Lorenzo Bianconi 2017-07-17 19:39:01 +02:00 committed by Jonathan Cameron
parent e3e25446a3
commit e7b4b45e1e
3 changed files with 13 additions and 2 deletions
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1
drivers/iio/humidity/hts221.h
View File

@ -61,6 +61,7 @@ struct hts221_hw {
extern const struct dev_pm_ops hts221_pm_ops;
int hts221_config_drdy(struct hts221_hw *hw, bool enable);
int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask, u8 val);
int hts221_probe(struct iio_dev *iio_dev);
int hts221_set_enable(struct hts221_hw *hw, bool enable);
int hts221_allocate_buffers(struct hts221_hw *hw);

11
drivers/iio/humidity/hts221_buffer.c
View File

@ -22,6 +22,8 @@
#include "hts221.h"
#define HTS221_REG_DRDY_HL_ADDR 0x22
#define HTS221_REG_DRDY_HL_MASK BIT(7)
#define HTS221_REG_STATUS_ADDR 0x27
#define HTS221_RH_DRDY_MASK BIT(1)
#define HTS221_TEMP_DRDY_MASK BIT(0)
@ -67,6 +69,7 @@ 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;
unsigned long irq_type;
int err;
@ -76,6 +79,10 @@ int hts221_allocate_trigger(struct hts221_hw *hw)
case IRQF_TRIGGER_HIGH:
case IRQF_TRIGGER_RISING:
break;
case IRQF_TRIGGER_LOW:
case IRQF_TRIGGER_FALLING:
irq_active_low = true;
break;
default:
dev_info(hw->dev,
"mode %lx unsupported, using IRQF_TRIGGER_RISING\n",
@ -84,6 +91,10 @@ int hts221_allocate_trigger(struct hts221_hw *hw)
break;
}
err = hts221_write_with_mask(hw, HTS221_REG_DRDY_HL_ADDR,
HTS221_REG_DRDY_HL_MASK, irq_active_low);
if (err < 0)
return err;
err = devm_request_threaded_irq(hw->dev, hw->irq, NULL,
hts221_trigger_handler_thread,
irq_type | IRQF_ONESHOT,

3
drivers/iio/humidity/hts221_core.c
View File

@ -135,8 +135,7 @@ static const struct iio_chan_spec hts221_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(2),
};
static int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask,
u8 val)
int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask, u8 val)
{
u8 data;
int err;