[PATCH v2 18/24] drm/bridge: parade-ps8622: Backlight update

[Sam Ravnborg]

- Use blacklight_get_brightness() helper
- Use devm_ variant to register backlight device and drop explicit
  unregister
- Use macro for initialization

Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
Cc: Andrzej Hajda <a.hajda at samsung.com>
Cc: Neil Armstrong <narmstrong at baylibre.com>
Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
Cc: Jonas Karlman <jonas at kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec at siol.net>
---
 drivers/gpu/drm/bridge/parade-ps8622.c | 43 +++++++++++++-------------
 1 file changed, 21 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
index d789ea2a7fb9..a46a883e0b8c 100644
--- a/drivers/gpu/drm/bridge/parade-ps8622.c
+++ b/drivers/gpu/drm/bridge/parade-ps8622.c
@@ -284,8 +284,7 @@ static int ps8622_send_config(struct ps8622_bridge *ps8622)
 			goto error;
 
 		/* FFh for 100% brightness, 0h for 0% brightness */
-		err = ps8622_set(cl, 0x01, 0xa7,
-				ps8622->bl->props.brightness);
+		err = ps8622_set(cl, 0x01, 0xa7, backlight_get_brightness(ps8622->bl));
 		if (err)
 			goto error;
 	} else {
@@ -331,18 +330,11 @@ static int ps8622_send_config(struct ps8622_bridge *ps8622)
 static int ps8622_backlight_update(struct backlight_device *bl)
 {
 	struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
-	int ret, brightness = bl->props.brightness;
-
-	if (bl->props.power != FB_BLANK_UNBLANK ||
-	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
-		brightness = 0;
 
 	if (!ps8622->enabled)
 		return -EINVAL;
 
-	ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
-
-	return ret;
+	return ps8622_set(ps8622->client, 0x01, 0xa7, backlight_get_brightness(bl));
 }
 
 static const struct backlight_ops ps8622_backlight_ops = {
@@ -521,7 +513,23 @@ static const struct drm_bridge_funcs ps8622_bridge_funcs = {
 	.attach = ps8622_attach,
 };
 
-static const struct of_device_id ps8622_devices[] = {
+static int ps8622_register_blacklight(struct device *dev, struct ps8622_bridge *ps8622)
+{
+	DECLARE_BACKLIGHT_INIT_RAW(props, PS8622_MAX_BRIGHTNESS, PS8622_MAX_BRIGHTNESS);
+	struct backlight_device *bl;
+
+	bl = devm_backlight_device_register(dev, dev_name(dev), dev,
+					    ps8622, &ps8622_backlight_ops, &props);
+	if (IS_ERR(bl)) {
+		DRM_ERROR("failed to register backlight\n");
+		return PTR_ERR(bl);
+	}
+
+	ps8622->bl = bl;
+	return 0;
+}
+
+const struct of_device_id ps8622_devices[] = {
 	{.compatible = "parade,ps8622",},
 	{.compatible = "parade,ps8625",},
 	{}
@@ -581,17 +589,9 @@ static int ps8622_probe(struct i2c_client *client,
 	}
 
 	if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
-		ps8622->bl = backlight_device_register("ps8622-backlight",
-				dev, ps8622, &ps8622_backlight_ops,
-				NULL);
-		if (IS_ERR(ps8622->bl)) {
-			DRM_ERROR("failed to register backlight\n");
-			ret = PTR_ERR(ps8622->bl);
-			ps8622->bl = NULL;
+		ret = ps8622_register_blacklight(dev, ps8622);
+		if (ret)
 			return ret;
-		}
-		ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
-		ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
 	}
 
 	ps8622->bridge.funcs = &ps8622_bridge_funcs;
@@ -607,7 +607,6 @@ static int ps8622_remove(struct i2c_client *client)
 {
 	struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
 
-	backlight_device_unregister(ps8622->bl);
 	drm_bridge_remove(&ps8622->bridge);
 
 	return 0;
-- 
2.25.1