Re: [PATCH v2] iio: hid-sensor-prox: Fix scale not correct issue

[Jonathan Cameron <jic23@kernel.org>]

On Sat, 30 Jan 2021 18:25:30 +0800
Ye Xiang <xiang.ye@intel.com> wrote:

> Currently, the proxy sensor scale is zero because it just return the
> exponent directly. To fix this issue, this patch use
> hid_sensor_format_scale to process the scale first then return the
> output.
> 
> Fixes: 39a3a0138f61 ("iio: hid-sensors: Added Proximity Sensor Driver")
> Signed-off-by: Ye Xiang <xiang.ye@intel.com>

Hi Ye Xiang,

There was a bit of fuzz on this so please take a look at
my fixes-togreg branch and check it went in cleanly.


> ---
> v2:
>   - Add Fixes tag
> 
> ---
>  drivers/iio/light/hid-sensor-prox.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/light/hid-sensor-prox.c b/drivers/iio/light/hid-sensor-prox.c
> index 4ab285a418d5..4abcfe48f1d4 100644
> --- a/drivers/iio/light/hid-sensor-prox.c
> +++ b/drivers/iio/light/hid-sensor-prox.c
> @@ -23,6 +23,9 @@ struct prox_state {
>  	struct hid_sensor_common common_attributes;
>  	struct hid_sensor_hub_attribute_info prox_attr;
>  	u32 human_presence;
> +	int scale_pre_decml;
> +	int scale_post_decml;
> +	int scale_precision;
>  };
>  
>  static const u32 prox_sensitivity_addresses[] = {
> @@ -98,8 +101,9 @@ static int prox_read_raw(struct iio_dev *indio_dev,
>  		ret_type = IIO_VAL_INT;
>  		break;
>  	case IIO_CHAN_INFO_SCALE:
> -		*val = prox_state->prox_attr.units;
> -		ret_type = IIO_VAL_INT;
> +		*val = prox_state->scale_pre_decml;
> +		*val2 = prox_state->scale_post_decml;
> +		ret_type = prox_state->scale_precision;
>  		break;
>  	case IIO_CHAN_INFO_OFFSET:
>  		*val = hid_sensor_convert_exponent(
> @@ -221,6 +225,11 @@ static int prox_parse_report(struct platform_device *pdev,
>  	dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
>  			st->prox_attr.report_id);
>  
> +	st->scale_precision = hid_sensor_format_scale(
> +				hsdev->usage,
> +				&st->prox_attr,
> +				&st->scale_pre_decml, &st->scale_post_decml);
> +
>  	return ret;
>  }
>