Bluetooth: hci_qca: Send VS pre shutdown command.

WCN399x chips are coex chips, it needs a VS pre shutdown
command while turning off the BT. So that chip can inform
BT is OFF to other active clients.
Signed-off-by: Harish Bandi <c-hbandi@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btqca.c

@@ -99,6 +99,27 @@ static int qca_send_reset(struct hci_dev *hdev)
 	return 0;
 }
 
+int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+	int err;
+
+	bt_dev_dbg(hdev, "QCA pre shutdown cmd");
+
+	skb = __hci_cmd_sync(hdev, QCA_PRE_SHUTDOWN_CMD, 0,
+				NULL, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "QCA preshutdown_cmd failed (%d)", err);
+		return err;
+	}
+
+	kfree_skb(skb);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qca_send_pre_shutdown_cmd);
+
 static void qca_tlv_check_data(struct rome_config *config,
 				const struct firmware *fw)
 {

drivers/bluetooth/btqca.h

@@ -13,6 +13,7 @@
 #define EDL_PATCH_TLV_REQ_CMD		(0x1E)
 #define EDL_NVM_ACCESS_SET_REQ_CMD	(0x01)
 #define MAX_SIZE_PER_TLV_SEGMENT	(243)
+#define QCA_PRE_SHUTDOWN_CMD		(0xFC08)
 
 #define EDL_CMD_REQ_RES_EVT		(0x00)
 #define EDL_PATCH_VER_RES_EVT		(0x19)
@@ -135,6 +136,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
 		   const char *firmware_name);
 int qca_read_soc_version(struct hci_dev *hdev, u32 *soc_version);
 int qca_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr);
+int qca_send_pre_shutdown_cmd(struct hci_dev *hdev);
 static inline bool qca_is_wcn399x(enum qca_btsoc_type soc_type)
 {
 	return soc_type == QCA_WCN3990 || soc_type == QCA_WCN3998;
@@ -167,4 +169,9 @@ static inline bool qca_is_wcn399x(enum qca_btsoc_type soc_type)
 {
 	return false;
 }
+
+static inline int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
+{
+	return -EOPNOTSUPP;
+}
 #endif

drivers/bluetooth/hci_qca.c

@@ -1386,6 +1386,9 @@ static int qca_power_off(struct hci_dev *hdev)
 {
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 
+	/* Perform pre shutdown command */
+	qca_send_pre_shutdown_cmd(hdev);
+
 	qca_power_shutdown(hu);
 	return 0;
 }