[PATCH v4 13/14] video: backlight: lm3533_bl: Implement backlight_scale property

[Svyatoslav Ryhel <clamor95@gmail.com>]

Since the device supports linear and non-linear modes, implement the
backlight_scale property to describe this state.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Daniel Thompson (RISCstar) <danielt@kernel.org>
---
 drivers/video/backlight/lm3533_bl.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index 4f8cde9f290d..2aa4b86042ff 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -142,6 +142,7 @@ static ssize_t store_linear(struct device *dev, struct device_attribute *attr,
 {
 	struct lm3533_bl *bl = dev_get_drvdata(dev);
 	int ctrlbank = lm3533_bl_get_ctrlbank_id(bl);
+	struct backlight_device *bd = bl->bd;
 	unsigned long linear;
 	int ret;
 
@@ -153,6 +154,9 @@ static ssize_t store_linear(struct device *dev, struct device_attribute *attr,
 	if (ret)
 		return ret;
 
+	bd->props.scale = linear ? BACKLIGHT_SCALE_LINEAR :
+				   BACKLIGHT_SCALE_NON_LINEAR;
+
 	return len;
 }
 
@@ -290,6 +294,8 @@ static int lm3533_bl_probe(struct platform_device *pdev)
 
 	bl->linear = device_property_read_bool(&pdev->dev,
 					       "ti,linear-mapping-mode");
+	props.scale = bl->linear ? BACKLIGHT_SCALE_LINEAR :
+				   BACKLIGHT_SCALE_NON_LINEAR;
 
 	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
 					    bl, &lm3533_bl_ops, &props);
-- 
2.53.0