Re: [PATCH] iio: hid-sensor: als: scale each channel individually

[Jonathan Cameron <jic23@kernel.org>]

On Mon, 27 Jul 2026 08:18:47 -0700
srinivas pandruvada <srinivas.pandruvada@linux.intel.com> wrote:

> On Thu, 2026-07-23 at 01:18 +0800, Daniel Schaefer via B4 Relay wrote:
> > From: Daniel Schaefer <dhs@frame.work>
> > 
> > Some sensors have multiple channels (not just brightness but color
> > ALS
> > sensors) with different scaling factors.
> > 
> > Tested on Asus ProArt PX13 laptop by Sven.
> > 
> > Signed-off-by: Daniel Schaefer <dhs@frame.work>
> > Link:
> > https://gitlab.freedesktop.org/hadess/iio-sensor-proxy/-/merge_requests/413
> > Cc: Sven Vainküla <sven@xn--vainkla-r2a.ee>
> > Cc: Jiri Kosina <jikos@kernel.org>
> > Cc: Jonathan Cameron <jic23@kernel.org>
> > Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> > Cc: David Lechner <dlechner@baylibre.com>
> > Cc: Nuno Sá <nuno.sa@analog.com>
> > Cc: Andy Shevchenko <andy@kernel.org>
> > Cc: linux-input@vger.kernel.org
> > Cc: linux-iio@vger.kernel.org
> > Cc: linux@frame.work  
> 
> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Added.  Thanks Srinivas!
J
> 
> > ---
> >  drivers/iio/light/hid-sensor-als.c | 22 ++++++++++++----------
> >  1 file changed, 12 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/iio/light/hid-sensor-als.c
> > b/drivers/iio/light/hid-sensor-als.c
> > index 384572844162..232cb58e0a9f 100644
> > --- a/drivers/iio/light/hid-sensor-als.c
> > +++ b/drivers/iio/light/hid-sensor-als.c
> > @@ -33,9 +33,9 @@ struct als_state {
> >  		u32 illum[CHANNEL_SCAN_INDEX_MAX];
> >  		aligned_s64 timestamp;
> >  	} scan;
> > -	int scale_pre_decml;
> > -	int scale_post_decml;
> > -	int scale_precision;
> > +	int scale_pre_decml[CHANNEL_SCAN_INDEX_MAX];
> > +	int scale_post_decml[CHANNEL_SCAN_INDEX_MAX];
> > +	int scale_precision[CHANNEL_SCAN_INDEX_MAX];
> >  	int value_offset;
> >  	int num_channels;
> >  	s64 timestamp;
> > @@ -186,9 +186,11 @@ static int als_read_raw(struct iio_dev
> > *indio_dev,
> >  		ret_type = IIO_VAL_INT;
> >  		break;
> >  	case IIO_CHAN_INFO_SCALE:
> > -		*val = als_state->scale_pre_decml;
> > -		*val2 = als_state->scale_post_decml;
> > -		ret_type = als_state->scale_precision;
> > +		if (chan->scan_index >= CHANNEL_SCAN_INDEX_MAX)
> > +			return -EINVAL;
> > +		*val = als_state->scale_pre_decml[chan->scan_index];
> > +		*val2 = als_state->scale_post_decml[chan-  
> > >scan_index];  
> > +		ret_type = als_state->scale_precision[chan-  
> > >scan_index];  
> >  		break;
> >  	case IIO_CHAN_INFO_OFFSET:
> >  		*val = als_state->value_offset;
> > @@ -338,6 +340,10 @@ static int als_parse_report(struct
> > platform_device *pdev,
> >  		als_adjust_channel_bit_mask(channels, index, st-  
> > >als[i].size);  
> >  		++index;
> >  
> > +		st->scale_precision[i] =
> > hid_sensor_format_scale(usage_id,
> > +					&st->als[i], &st-  
> > >scale_pre_decml[i],  
> > +					&st->scale_post_decml[i]);
> > +
> >  		dev_dbg(&pdev->dev, "als %x:%x\n", st->als[i].index,
> >  			st->als[i].report_id);
> >  	}
> > @@ -347,10 +353,6 @@ static int als_parse_report(struct
> > platform_device *pdev,
> >  	if (index)
> >  		ret = 0;
> >  
> > -	st->scale_precision = hid_sensor_format_scale(usage_id,
> > -				&st-  
> > >als[CHANNEL_SCAN_INDEX_INTENSITY],  
> > -				&st->scale_pre_decml, &st-  
> > >scale_post_decml);  
> > -
> >  	return ret;
> >  }
> >  
> > 
> > ---
> > base-commit: 194a48576843858afcd9c00ed4f105ec2b398e6c
> > change-id: 20260723-chromaticity-88fec417f00c
> > 
> > Best regards,  
>