[PATCH 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves

[Matthias Kaehlcke]

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 <m...@chromium.org>
---
 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,
-- 
2.22.0.rc2.383.gf4fbbf30c2-goog