Hi Matthias, On 13/6/19 21:43, Matthias Kaehlcke wrote: > For backlight curves calculated with the CIE 1931 algorithm set > the brightness scale type property accordingly. This makes the > scale type available to userspace via the 'scale' sysfs attribute. > > Signed-off-by: Matthias Kaehlcke <[email protected]>
Tested on Samsung Chromebook Plus which uses the CIE 1931 algorithm. Tested-by: Enric Balletbo i Serra <[email protected]> > --- > drivers/video/backlight/pwm_bl.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/video/backlight/pwm_bl.c > b/drivers/video/backlight/pwm_bl.c > index fb45f866b923..f067fe7aa35d 100644 > --- a/drivers/video/backlight/pwm_bl.c > +++ b/drivers/video/backlight/pwm_bl.c > @@ -553,6 +553,8 @@ static int pwm_backlight_probe(struct platform_device > *pdev) > goto err_alloc; > } > > + memset(&props, 0, sizeof(struct backlight_properties)); > + > if (data->levels) { > /* > * For the DT case, only when brightness levels is defined > @@ -591,6 +593,8 @@ static int pwm_backlight_probe(struct platform_device > *pdev) > > pb->levels = data->levels; > } > + > + props.scale = BACKLIGHT_SCALE_CIE1931; > } else { > /* > * That only happens for the non-DT case, where platform data > @@ -601,7 +605,6 @@ static int pwm_backlight_probe(struct platform_device > *pdev) > > pb->lth_brightness = data->lth_brightness * (state.period / pb->scale); > > - memset(&props, 0, sizeof(struct backlight_properties)); > props.type = BACKLIGHT_RAW; > props.max_brightness = data->max_brightness; > bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb, >
