Re: [PATCH v2 6/6] iio: imu: st_lsm6dsx: add motion report function and call from interrupt

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> Report iio motion events to iio subsystem
> 
> Signed-off-by: Sean Nyekjaer <sean@geanix.com>
> ---
> 
> Changes since v1:
>  * none
> 
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 52 ++++++++++++++++++++
>  1 file changed, 52 insertions(+)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 0503abab6efc..acc653d5e00e 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -39,6 +39,7 @@
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/delay.h>
> +#include <linux/iio/events.h>
>  #include <linux/iio/iio.h>
>  #include <linux/iio/sysfs.h>
>  #include <linux/interrupt.h>
> @@ -76,6 +77,12 @@
>  #define ST_LSM6DSX_REG_GYRO_OUT_Y_L_ADDR	0x24
>  #define ST_LSM6DSX_REG_GYRO_OUT_Z_L_ADDR	0x26
>  
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_ADDR		0x1B
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_Z_WU_MASK	BIT(0)
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_Y_WU_MASK	BIT(1)
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_X_WU_MASK	BIT(2)
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_WU_MASK	BIT(3)
> +
>  #define ST_LSM6DSX_REG_TAP_CFG_ADDR		0x58
>  #define ST_LSM6DSX_REG_TAP_CFG_INT_EN_MASK	BIT(7)
>  
> @@ -1212,6 +1219,39 @@ int st_lsm6dsx_event_setup(int id, struct st_lsm6dsx_hw *hw)
>  
>  	return err;
>  }
> +int st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw, int data)
> +{
> +	s64 timestamp = iio_get_time_ns(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
> +
> +	if (data & ST_LSM6DSX_REG_WAKE_UP_SRC_Z_WU_MASK)
> +		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
> +			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> +						  0,
> +						  IIO_MOD_Z,
> +						  IIO_EV_TYPE_THRESH,
> +						  IIO_EV_DIR_EITHER),
> +						  timestamp);
> +
> +	if (data & ST_LSM6DSX_REG_WAKE_UP_SRC_Y_WU_MASK)
> +		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
> +			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> +						  0,
> +						  IIO_MOD_Y,
> +						  IIO_EV_TYPE_THRESH,
> +						  IIO_EV_DIR_EITHER),
> +						  timestamp);
> +
> +	if (data & ST_LSM6DSX_REG_WAKE_UP_SRC_X_WU_MASK)
> +		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
> +			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> +						  0,
> +						  IIO_MOD_X,
> +						  IIO_EV_TYPE_THRESH,
> +						  IIO_EV_DIR_EITHER),
> +						  timestamp);
> +
> +	return 0;
> +}
>  
>  static irqreturn_t st_lsm6dsx_handler_irq(int irq, void *private)
>  {
> @@ -1222,7 +1262,19 @@ static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
>  {
>  	struct st_lsm6dsx_hw *hw = private;
>  	int count = 0;
> +	int data, err;
> +
> +	if (hw->enable_event) {
> +		err = regmap_read(hw->regmap,
> +				  ST_LSM6DSX_REG_WAKE_UP_SRC_ADDR, &data);

I think we can move the ST_LSM6DSX_REG_WAKE_UP_SRC_ADDR read in
st_lsm6dsx_report_motion_event (and rename it) and avoid goto try_fifo

> +		if (err < 0)
> +			goto try_fifo;
> +
> +		if (data & ST_LSM6DSX_REG_WAKE_UP_SRC_WU_MASK)
> +			st_lsm6dsx_report_motion_event(hw, data);
> +	}
>  
> +try_fifo:
>  	if (hw->sip > 0) {
>  		mutex_lock(&hw->fifo_lock);
>  		count = st_lsm6dsx_read_fifo(hw);
> -- 
> 2.22.0
> 

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