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

From: Matthias Kaehlcke <mka@chromium.org>
To: Thierry Reding <thierry.reding@gmail.com>,
	Lee Jones <lee.jones@linaro.org>,
	Daniel Thompson <daniel.thompson@linaro.org>,
	Jingoo Han <jingoohan1@gmail.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: linux-pwm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Enric Balletbo i Serra <enric.balletbo@collabora.com>,
	Douglas Anderson <dianders@chromium.org>,
	Brian Norris <briannorris@chromium.org>,
	Pavel Machek <pavel@ucw.cz>,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>,
	Matthias Kaehlcke <mka@chromium.org>
Subject: [PATCH 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves
Date: Thu, 13 Jun 2019 12:43:25 -0700	[thread overview]
Message-ID: <20190613194326.180889-4-mka@chromium.org> (raw)
In-Reply-To: <20190613194326.180889-1-mka@chromium.org>

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@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

