auxdisplay: ht16k33: Extract ht16k33_brightness_set()

Extract brightness handling into a helper function, so it can be called
from multiple places.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Robin van der Gracht <robin@protonic.nl>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

drivers/auxdisplay/ht16k33.c

@@ -113,6 +113,22 @@ static int ht16k33_display_off(struct ht16k33_priv *priv)
 	return i2c_smbus_write_byte(priv->client, REG_DISPLAY_SETUP);
 }
 
+static int ht16k33_brightness_set(struct ht16k33_priv *priv,
+				  unsigned int brightness)
+{
+	int err;
+
+	if (brightness == 0)
+		return ht16k33_display_off(priv);
+
+	err = ht16k33_display_on(priv);
+	if (err)
+		return err;
+
+	return i2c_smbus_write_byte(priv->client,
+				    REG_BRIGHTNESS | (brightness - 1));
+}
+
 static void ht16k33_fb_queue(struct ht16k33_priv *priv)
 {
 	struct ht16k33_fbdev *fbdev = &priv->fbdev;
@@ -197,13 +213,10 @@ static int ht16k33_bl_update_status(struct backlight_device *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_display_off(priv);
-	}
+	    bl->props.state & BL_CORE_FBBLANK)
+		brightness = 0;
 
-	ht16k33_display_on(priv);
-	return i2c_smbus_write_byte(priv->client,
-				    REG_BRIGHTNESS | (brightness - 1));
+	return ht16k33_brightness_set(priv, brightness);
 }
 
 static int ht16k33_bl_check_fb(struct backlight_device *bl, struct fb_info *fi)