On Oct 30, Francesco Lavra wrote:
> The st_lsm6dsx_event_settings structure contains fields specific
> for one event type (wakeup). In preparation for adding support for
> more event types, introduce an event id enum and a generic event
> source structure, and replace wakeup-specific data in struct
> st_lsm6dsx_event_settings with an array of event source structures.
> 
> Signed-off-by: Francesco Lavra <flavra@baylibre.com>
> ---
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h      |  21 ++-
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 136 +++++++++++--------
>  2 files changed, 96 insertions(+), 61 deletions(-)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> index db863bd1898d..05689887f7ec 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> @@ -221,14 +221,23 @@ struct st_lsm6dsx_shub_settings {
>  	u8 pause;
>  };
>  
> +enum st_lsm6dsx_event_id {
> +	ST_LSM6DSX_EVENT_WAKEUP,
> +	ST_LSM6DSX_EVENT_MAX
> +};
> +
> +struct st_lsm6dsx_event_src {
> +	struct st_lsm6dsx_reg value;
> +	u8 status_reg;
> +	u8 status_mask;
> +	u8 status_x_mask;
> +	u8 status_y_mask;
> +	u8 status_z_mask;

you can use st_lsm6dsx_reg here.

> +};
> +
>  struct st_lsm6dsx_event_settings {
>  	struct st_lsm6dsx_reg enable_reg;
> -	struct st_lsm6dsx_reg wakeup_reg;
> -	u8 wakeup_src_reg;
> -	u8 wakeup_src_status_mask;
> -	u8 wakeup_src_z_mask;
> -	u8 wakeup_src_y_mask;
> -	u8 wakeup_src_x_mask;
> +	struct st_lsm6dsx_event_src sources[ST_LSM6DSX_EVENT_MAX];
>  };
>  
>  enum st_lsm6dsx_ext_sensor_id {
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 17b46e15cce5..bb4c4c531128 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -350,15 +350,19 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.event_settings = {
> -			.wakeup_reg = {
> -				.addr = 0x5B,
> -				.mask = GENMASK(5, 0),
> +			.sources = {
> +				[ST_LSM6DSX_EVENT_WAKEUP] = {
> +					.value = {
> +						.addr = 0x5b,
> +						.mask = GENMASK(5, 0),
> +					},
> +					.status_reg = 0x1b,
> +					.status_mask = BIT(3),
> +					.status_z_mask = BIT(0),
> +					.status_y_mask = BIT(1),
> +					.status_x_mask = BIT(2),
> +				},
>  			},
> -			.wakeup_src_reg = 0x1b,
> -			.wakeup_src_status_mask = BIT(3),
> -			.wakeup_src_z_mask = BIT(0),
> -			.wakeup_src_y_mask = BIT(1),
> -			.wakeup_src_x_mask = BIT(2),
>  		},
>  	},
>  	{
> @@ -510,15 +514,19 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.event_settings = {
> -			.wakeup_reg = {
> -				.addr = 0x5B,
> -				.mask = GENMASK(5, 0),
> +			.sources = {
> +				[ST_LSM6DSX_EVENT_WAKEUP] = {
> +					.value = {
> +						.addr = 0x5b,
> +						.mask = GENMASK(5, 0),
> +					},
> +					.status_reg = 0x1b,
> +					.status_mask = BIT(3),
> +					.status_z_mask = BIT(0),
> +					.status_y_mask = BIT(1),
> +					.status_x_mask = BIT(2),
> +				},
>  			},
> -			.wakeup_src_reg = 0x1b,
> -			.wakeup_src_status_mask = BIT(3),
> -			.wakeup_src_z_mask = BIT(0),
> -			.wakeup_src_y_mask = BIT(1),
> -			.wakeup_src_x_mask = BIT(2),
>  		},
>  	},
>  	{
> @@ -741,15 +749,19 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.addr = 0x58,
>  				.mask = BIT(7),
>  			},
> -			.wakeup_reg = {
> -				.addr = 0x5B,
> -				.mask = GENMASK(5, 0),
> +			.sources = {
> +				[ST_LSM6DSX_EVENT_WAKEUP] = {
> +					.value = {
> +						.addr = 0x5b,
> +						.mask = GENMASK(5, 0),
> +					},
> +					.status_reg = 0x1b,
> +					.status_mask = BIT(3),
> +					.status_z_mask = BIT(0),
> +					.status_y_mask = BIT(1),
> +					.status_x_mask = BIT(2),
> +				},
>  			},
> -			.wakeup_src_reg = 0x1b,
> -			.wakeup_src_status_mask = BIT(3),
> -			.wakeup_src_z_mask = BIT(0),
> -			.wakeup_src_y_mask = BIT(1),
> -			.wakeup_src_x_mask = BIT(2),
>  		},
>  	},
>  	{
> @@ -972,15 +984,19 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.addr = 0x58,
>  				.mask = BIT(7),
>  			},
> -			.wakeup_reg = {
> -				.addr = 0x5b,
> -				.mask = GENMASK(5, 0),
> +			.sources = {
> +				[ST_LSM6DSX_EVENT_WAKEUP] = {
> +					.value = {
> +						.addr = 0x5b,
> +						.mask = GENMASK(5, 0),
> +					},
> +					.status_reg = 0x1b,
> +					.status_mask = BIT(3),
> +					.status_z_mask = BIT(0),
> +					.status_y_mask = BIT(1),
> +					.status_x_mask = BIT(2),
> +				},
>  			},
> -			.wakeup_src_reg = 0x1b,
> -			.wakeup_src_status_mask = BIT(3),
> -			.wakeup_src_z_mask = BIT(0),
> -			.wakeup_src_y_mask = BIT(1),
> -			.wakeup_src_x_mask = BIT(2),
>  		},
>  	},
>  	{
> @@ -1147,15 +1163,19 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.addr = 0x58,
>  				.mask = BIT(7),
>  			},
> -			.wakeup_reg = {
> -				.addr = 0x5B,
> -				.mask = GENMASK(5, 0),
> +			.sources = {
> +				[ST_LSM6DSX_EVENT_WAKEUP] = {
> +					.value = {
> +						.addr = 0x5b,
> +						.mask = GENMASK(5, 0),
> +					},
> +					.status_reg = 0x1b,
> +					.status_mask = BIT(3),
> +					.status_z_mask = BIT(0),
> +					.status_y_mask = BIT(1),
> +					.status_x_mask = BIT(2),
> +				},
>  			},
> -			.wakeup_src_reg = 0x1b,
> -			.wakeup_src_status_mask = BIT(3),
> -			.wakeup_src_z_mask = BIT(0),
> -			.wakeup_src_y_mask = BIT(1),
> -			.wakeup_src_x_mask = BIT(2),
>  		},
>  	},
>  	{
> @@ -1347,15 +1367,19 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  				.addr = 0x50,
>  				.mask = BIT(7),
>  			},
> -			.wakeup_reg = {
> -				.addr = 0x5b,
> -				.mask = GENMASK(5, 0),
> +			.sources = {
> +				[ST_LSM6DSX_EVENT_WAKEUP] = {
> +					.value = {
> +						.addr = 0x5b,
> +						.mask = GENMASK(5, 0),
> +					},
> +					.status_reg = 0x45,
> +					.status_mask = BIT(3),
> +					.status_z_mask = BIT(0),
> +					.status_y_mask = BIT(1),
> +					.status_x_mask = BIT(2),
> +				},
>  			},
> -			.wakeup_src_reg = 0x45,
> -			.wakeup_src_status_mask = BIT(3),
> -			.wakeup_src_z_mask = BIT(0),
> -			.wakeup_src_y_mask = BIT(1),
> -			.wakeup_src_x_mask = BIT(2),
>  		},
>  	},
>  	{
> @@ -1861,7 +1885,7 @@ st_lsm6dsx_write_event(struct iio_dev *iio_dev,
>  	if (val < 0 || val > 31)
>  		return -EINVAL;
>  
> -	reg = &hw->settings->event_settings.wakeup_reg;
> +	reg = &hw->settings->event_settings.sources[ST_LSM6DSX_EVENT_WAKEUP].value;
>  	data = ST_LSM6DSX_SHIFT_VAL(val, reg->mask);
>  	err = st_lsm6dsx_update_bits_locked(hw, reg->addr,
>  					    reg->mask, data);
> @@ -2318,7 +2342,7 @@ static int st_lsm6dsx_chan_init(struct iio_chan_spec *channels, struct st_lsm6ds
>  	chan->scan_type.endianness = IIO_LE;
>  	chan->ext_info = st_lsm6dsx_ext_info;
>  	if (id == ST_LSM6DSX_ID_ACC) {
> -		if (hw->settings->event_settings.wakeup_reg.addr) {
> +		if (hw->settings->event_settings.sources[ST_LSM6DSX_EVENT_WAKEUP].value.addr) {
>  			chan->event_spec = &st_lsm6dsx_event;
>  			chan->num_event_specs = 1;
>  		}
> @@ -2389,6 +2413,7 @@ static bool
>  st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw)
>  {
>  	const struct st_lsm6dsx_event_settings *event_settings;
> +	const struct st_lsm6dsx_event_src *event_src;
>  	int err, data;
>  	s64 timestamp;
>  
> @@ -2396,13 +2421,14 @@ st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw)
>  		return false;
>  
>  	event_settings = &hw->settings->event_settings;
> -	err = st_lsm6dsx_read_locked(hw, event_settings->wakeup_src_reg,
> +	event_src = &event_settings->sources[ST_LSM6DSX_EVENT_WAKEUP];
> +	err = st_lsm6dsx_read_locked(hw, event_src->status_reg,
>  				     &data, sizeof(data));
>  	if (err < 0)
>  		return false;
>  
>  	timestamp = iio_get_time_ns(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
> -	if ((data & hw->settings->event_settings.wakeup_src_z_mask) &&
> +	if ((data & event_src->status_z_mask) &&
>  	    (hw->enable_event & BIT(IIO_MOD_Z)))
>  		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
>  			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> @@ -2412,7 +2438,7 @@ st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw)
>  						  IIO_EV_DIR_EITHER),
>  						  timestamp);
>  
> -	if ((data & hw->settings->event_settings.wakeup_src_y_mask) &&
> +	if ((data & event_src->status_y_mask) &&
>  	    (hw->enable_event & BIT(IIO_MOD_Y)))
>  		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
>  			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> @@ -2422,7 +2448,7 @@ st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw)
>  						  IIO_EV_DIR_EITHER),
>  						  timestamp);
>  
> -	if ((data & hw->settings->event_settings.wakeup_src_x_mask) &&
> +	if ((data & event_src->status_x_mask) &&
>  	    (hw->enable_event & BIT(IIO_MOD_X)))
>  		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
>  			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> @@ -2432,7 +2458,7 @@ st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw)
>  						  IIO_EV_DIR_EITHER),
>  						  timestamp);
>  
> -	return data & event_settings->wakeup_src_status_mask;
> +	return data & event_src->status_mask;
>  }
>  
>  static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
> -- 
> 2.39.5
>