leds: an30259a: Get rid of custom led_init_default_state_get()

LED core provides a helper to parse default state from firmware node.
Use it instead of custom implementation.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230103131256.33894-4-andriy.shevchenko@linux.intel.com

drivers/leds/leds-an30259a.c

@@ -55,10 +55,6 @@
 
 #define AN30259A_NAME "an30259a"
 
-#define STATE_OFF 0
-#define STATE_KEEP 1
-#define STATE_ON 2
-
 struct an30259a;
 
 struct an30259a_led {
@@ -66,7 +62,7 @@ struct an30259a_led {
 	struct fwnode_handle *fwnode;
 	struct led_classdev cdev;
 	u32 num;
-	u32 default_state;
+	enum led_default_state default_state;
 	bool sloping;
 };
 
@@ -205,7 +201,6 @@ static int an30259a_dt_init(struct i2c_client *client,
 	struct device_node *np = dev_of_node(&client->dev), *child;
 	int count, ret;
 	int i = 0;
-	const char *str;
 	struct an30259a_led *led;
 
 	count = of_get_available_child_count(np);
@@ -228,15 +223,7 @@ static int an30259a_dt_init(struct i2c_client *client,
 		led->num = source;
 		led->chip = chip;
 		led->fwnode = of_fwnode_handle(child);
-
-		if (!of_property_read_string(child, "default-state", &str)) {
-			if (!strcmp(str, "on"))
-				led->default_state = STATE_ON;
-			else if (!strcmp(str, "keep"))
-				led->default_state = STATE_KEEP;
-			else
-				led->default_state = STATE_OFF;
-		}
+		led->default_state = led_init_default_state_get(led->fwnode);
 
 		i++;
 	}
@@ -261,10 +248,10 @@ static void an30259a_init_default_state(struct an30259a_led *led)
 	int led_on, err;
 
 	switch (led->default_state) {
-	case STATE_ON:
+	case LEDS_DEFSTATE_ON:
 		led->cdev.brightness = LED_FULL;
 		break;
-	case STATE_KEEP:
+	case LEDS_DEFSTATE_KEEP:
 		err = regmap_read(chip->regmap, AN30259A_REG_LED_ON, &led_on);
 		if (err)
 			break;