Re: [PATCH v3 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

+static int iei_wt61p803_puzzle_led_brightness_set_blocking(struct led_classdev *cdev,
+		enum led_brightness brightness)
+{
+	struct iei_wt61p803_puzzle_led *priv = cdev_to_iei_wt61p803_puzzle_led(cdev);
+	unsigned char *resp_buf = priv->response_buffer;
+	unsigned char led_power_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_LED,
+		IEI_WT61P803_PUZZLE_CMD_LED_POWER,
+		(char)IEI_LED_OFF
+	};
+	size_t reply_size;
+
+	mutex_lock(&priv->lock);
+	if (brightness == LED_OFF) {
+		led_power_cmd[3] = (char)IEI_LED_OFF;
+		priv->led_power_state = LED_OFF;
+	} else {
+		led_power_cmd[3] = (char)IEI_LED_ON;
+		priv->led_power_state = LED_ON;
+	}
+	mutex_unlock(&priv->lock);
+
+	return iei_wt61p803_puzzle_write_command(priv->mcu, led_power_cmd,
+			sizeof(led_power_cmd), resp_buf, &reply_size);
+}