linux-kernel - [PATCH v2 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves

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Message-Id: <20190624203114.93277-4-mka@chromium.org>
Date:   Mon, 24 Jun 2019 13:31:12 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     linux-pwm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Douglas Anderson <dianders@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Pavel Machek <pavel@....cz>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v2 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves

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 <mka@...omium.org>
Tested-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
---
Changes in v2:
- added Enric's 'Tested-by' tag
- added Daniel's 'Acked-by' tag
---
 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,
-- 
2.22.0.410.gd8fdbe21b5-goog