Bluetooth: hci: added h4_close function

Inside the hci driver API in h4.c, there were no
API function allowing to close the bluetooth
interface, as there were close function defined
for other bluetooth hci driver.

The function disables Bluetooth reception and
sending, and calls a weak function allowing
to implement user specific behaviors
while shutting down bluetooth interface

Signed-off-by: FILLIOT Louis <[email protected]>

drivers/bluetooth/hci/h4.c

@@ -545,6 +545,35 @@ static int h4_open(const struct device *dev, bt_hci_recv_t recv)
 	return 0;
 }
 
+int __weak bt_hci_transport_teardown(const struct device *dev)
+{
+	return 0;
+}
+
+static int h4_close(const struct device *dev)
+{
+	const struct h4_config *cfg = dev->config;
+	struct h4_data *h4 = dev->data;
+	int err;
+
+	LOG_DBG("");
+
+	uart_irq_rx_disable(cfg->uart);
+	uart_irq_tx_disable(cfg->uart);
+
+	err = bt_hci_transport_teardown(cfg->uart);
+	if (err < 0) {
+		return err;
+	}
+
+	/* Abort RX thread */
+	k_thread_abort(cfg->rx_thread);
+
+	h4->recv = NULL;
+
+	return 0;
+}
+
 #if defined(CONFIG_BT_HCI_SETUP)
 static int h4_setup(const struct device *dev, const struct bt_hci_setup_params *params)
 {
@@ -567,6 +596,7 @@ static int h4_setup(const struct device *dev, const struct bt_hci_setup_params *
 static DEVICE_API(bt_hci, h4_driver_api) = {
 	.open = h4_open,
 	.send = h4_send,
+	.close = h4_close,
 #if defined(CONFIG_BT_HCI_SETUP)
 	.setup = h4_setup,
 #endif