diff options
| author | Matthias Kaehlcke <mka@chromium.org> | 2019-07-09 21:00:06 +0200 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2019-09-02 16:55:11 +0200 |
| commit | 511a204638d7d750f859c332635d09f38273b4f0 (patch) | |
| tree | 8b7006b351fe99a23df34284317da4ea3553d4fc | |
| parent | backlight: Expose brightness curve type through sysfs (diff) | |
| download | linux-511a204638d7d750f859c332635d09f38273b4f0.tar.xz linux-511a204638d7d750f859c332635d09f38273b4f0.zip | |
backlight: pwm_bl: Set scale type for CIE 1931 curves
For backlight curves calculated with the CIE 1931 algorithm set
the brightness scale type to non-linear. This makes the scale type
available to userspace via the 'scale' sysfs attribute.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 2201b8c78641..d6d2b6407d7e 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -536,6 +536,8 @@ 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 @@ -574,6 +576,8 @@ static int pwm_backlight_probe(struct platform_device *pdev) pb->levels = data->levels; } + + props.scale = BACKLIGHT_SCALE_NON_LINEAR; } else { /* * That only happens for the non-DT case, where platform data @@ -584,7 +588,6 @@ 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, |