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iio: imu: st_lsm6dsx: add possibility to select drdy pin 

Add capability to route data ready signal on pin 1 or pin 2 of the package

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2017-01-22 19:32:24 +01:00 committed by Jonathan Cameron
parent 3adbf34273
commit dba329048e
1 changed files with 53 additions and 6 deletions
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59
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
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@ -37,11 +37,14 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/platform_data/st_sensors_pdata.h>
#include "st_lsm6dsx.h"
#define ST_LSM6DSX_REG_ACC_DEC_MASK GENMASK(2, 0)
#define ST_LSM6DSX_REG_GYRO_DEC_MASK GENMASK(5, 3)
#define ST_LSM6DSX_REG_INT1_ADDR 0x0d
#define ST_LSM6DSX_REG_INT2_ADDR 0x0e
#define ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK BIT(3)
#define ST_LSM6DSX_REG_WHOAMI_ADDR 0x0f
#define ST_LSM6DSX_REG_RESET_ADDR 0x12
@ -532,10 +535,56 @@ static const struct iio_info st_lsm6dsx_gyro_info = {
static const unsigned long st_lsm6dsx_available_scan_masks[] = {0x7, 0x0};
static int st_lsm6dsx_of_get_drdy_pin(struct st_lsm6dsx_hw *hw, int *drdy_pin)
{
struct device_node *np = hw->dev->of_node;
int err;
if (!np)
return -EINVAL;
err = of_property_read_u32(np, "st,drdy-int-pin", drdy_pin);
if (err == -ENODATA) {
/* if the property has not been specified use default value */
*drdy_pin = 1;
err = 0;
}
return err;
}
static int st_lsm6dsx_get_drdy_reg(struct st_lsm6dsx_hw *hw, u8 *drdy_reg)
{
int err = 0, drdy_pin;
if (st_lsm6dsx_of_get_drdy_pin(hw, &drdy_pin) < 0) {
struct st_sensors_platform_data *pdata;
struct device *dev = hw->dev;
pdata = (struct st_sensors_platform_data *)dev->platform_data;
drdy_pin = pdata ? pdata->drdy_int_pin : 1;
}
switch (drdy_pin) {
case 1:
*drdy_reg = ST_LSM6DSX_REG_INT1_ADDR;
break;
case 2:
*drdy_reg = ST_LSM6DSX_REG_INT2_ADDR;
break;
default:
dev_err(hw->dev, "unsupported data ready pin\n");
err = -EINVAL;
break;
}
return err;
}
static int st_lsm6dsx_init_device(struct st_lsm6dsx_hw *hw)
{
u8 data, drdy_int_reg;
int err;
u8 data;
data = ST_LSM6DSX_REG_RESET_MASK;
err = hw->tf->write(hw->dev, ST_LSM6DSX_REG_RESET_ADDR, sizeof(data),
@ -563,14 +612,12 @@ static int st_lsm6dsx_init_device(struct st_lsm6dsx_hw *hw)
return err;
/* enable FIFO watermak interrupt */
err = st_lsm6dsx_write_with_mask(hw, ST_LSM6DSX_REG_INT1_ADDR,
ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK, 1);
err = st_lsm6dsx_get_drdy_reg(hw, &drdy_int_reg);
if (err < 0)
return err;
/* redirect INT2 on INT1 */
return st_lsm6dsx_write_with_mask(hw, ST_LSM6DSX_REG_INT2_ON_INT1_ADDR,
ST_LSM6DSX_REG_INT2_ON_INT1_MASK, 1);
return st_lsm6dsx_write_with_mask(hw, drdy_int_reg,
ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK, 1);
}
static struct iio_dev *st_lsm6dsx_alloc_iiodev(struct st_lsm6dsx_hw *hw,