linux-kernel - [PATCH v2] auxdisplay: ht16k33: Use backlight helper

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Date:   Fri,  6 Jan 2023 15:30:01 +0100
From:   Stephen Kitt <steve@....org>
To:     Robin van der Gracht <robin@...tonic.nl>,
        Miguel Ojeda <ojeda@...nel.org>
Cc:     Stephen Kitt <steve@....org>, linux-kernel@...r.kernel.org
Subject: [PATCH v2] auxdisplay: ht16k33: Use backlight helper

backlight_properties.fb_blank is deprecated. The states it represents
are handled by other properties; but instead of accessing those
properties directly, drivers should use the helpers provided by
backlight.h.

Instead of retrieving the backlight brightness in struct
backlight_properties manually, and then checking whether the backlight
should be on at all, use backlight_get_brightness() which does all
this and insulates this from future changes.

This means that BL_CORE_SUSPENDED is now taken into account, as it
should be.

Signed-off-by: Stephen Kitt <steve@....org>
---

Notes:
    Changes since v1: mention BL_CORE_SUSPENDED.

 drivers/auxdisplay/ht16k33.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index 02425991c159..15ab118c80f5 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -314,14 +314,9 @@ static int ht16k33_initialize(struct ht16k33_priv *priv)

 static int ht16k33_bl_update_status(struct backlight_device *bl)
 {
-	int brightness = bl->props.brightness;
+	int brightness = backlight_get_brightness(bl);
 	struct ht16k33_priv *priv = bl_get_data(bl);

-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
-	    bl->props.state & BL_CORE_FBBLANK)
-		brightness = 0;
-
 	return ht16k33_brightness_set(priv, brightness);
 }

-- 
2.30.2