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iio: imu: st_lsm6dsx: support open drain mode 

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@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
hifive-unleashed-5.1
Lorenzo Bianconi 2017-06-21 21:21:28 +02:00 committed by Jonathan Cameron
parent fb78285101
commit ff5fff4af4
1 changed files with 17 additions and 0 deletions
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17
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
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@ -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,