Bluetooth: hci_qca: Add device_may_wakeup support

Based on device may wakeup status, Bluez stack will enable/disable
passive scanning with whitelist in BT controller while suspending.
As interrupt from BT SoC is handled by UART driver,we need to use
device handle of UART driver to get the status of device may wakeup
Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_qca.c

@@ -1571,6 +1571,20 @@ static void qca_cmd_timeout(struct hci_dev *hdev)
 	mutex_unlock(&qca->hci_memdump_lock);
 }
 
+static bool qca_prevent_wake(struct hci_dev *hdev)
+{
+	struct hci_uart *hu = hci_get_drvdata(hdev);
+	bool wakeup;
+
+	/* UART driver handles the interrupt from BT SoC.So we need to use
+	 * device handle of UART driver to get the status of device may wakeup.
+	 */
+	wakeup = device_may_wakeup(hu->serdev->ctrl->dev.parent);
+	bt_dev_dbg(hu->hdev, "wakeup status : %d", wakeup);
+
+	return !wakeup;
+}
+
 static int qca_wcn3990_init(struct hci_uart *hu)
 {
 	struct qca_serdev *qcadev;
@@ -1721,6 +1735,7 @@ static int qca_setup(struct hci_uart *hu)
 		qca_debugfs_init(hdev);
 		hu->hdev->hw_error = qca_hw_error;
 		hu->hdev->cmd_timeout = qca_cmd_timeout;
+		hu->hdev->prevent_wake = qca_prevent_wake;
 	} else if (ret == -ENOENT) {
 		/* No patch/nvm-config found, run with original fw/config */
 		set_bit(QCA_ROM_FW, &qca->flags);