Re: [PATCH v4 1/4] iio: cros_ec: Add sign vector in core for backward compatibility

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 28 Jun 2019 12:17:08 -0700
Gwendal Grignou <gwendal@chromium.org> wrote:

> To allow cros_ec iio core library to be used with legacy device, add a
> vector to rotate sensor data if necessary: legacy devices are not
> reporting data in HTML5/Android sensor referential.
> 
> Check the data is not rotated on recent chromebooks that use the HTML5
> standard to present sensor data.
> 
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

As I mentioned in one of the other series.  I've lost track of whether
anyone wants me to apply any of these through IIO, so will just ack
them as appropriate and assume someone will shout if they do want
me to pick them up ;)

Thanks,

Jonathan

> ---
>  drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c | 4 ++++
>  include/linux/iio/common/cros_ec_sensors_core.h           | 1 +
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index 719a0df5aeeb..e8a4d78659c8 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -66,6 +66,9 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
>  		}
>  		state->type = state->resp->info.type;
>  		state->loc = state->resp->info.location;
> +
> +		/* Set sign vector, only used for backward compatibility. */
> +		memset(state->sign, 1, CROS_EC_SENSOR_MAX_AXIS);
>  	}
>  
>  	return 0;
> @@ -254,6 +257,7 @@ static int cros_ec_sensors_read_data_unsafe(struct iio_dev *indio_dev,
>  		if (ret < 0)
>  			return ret;
>  
> +		*data *= st->sign[i];
>  		data++;
>  	}
>  
> diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> index ce16445411ac..a1c85ad4df91 100644
> --- a/include/linux/iio/common/cros_ec_sensors_core.h
> +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> @@ -71,6 +71,7 @@ struct cros_ec_sensors_core_state {
>  	enum motionsensor_location loc;
>  
>  	s16 calib[CROS_EC_SENSOR_MAX_AXIS];
> +	s8 sign[CROS_EC_SENSOR_MAX_AXIS];
>  
>  	u8 samples[CROS_EC_SAMPLE_SIZE];
>