From 9798fbdee88a893758f1432efdfe498ae410aab8 Mon Sep 17 00:00:00 2001
From: Kiran K <kiran.k@intel.com>
Date: Tue, 7 Sep 2021 15:42:44 +0530
Subject: [PATCH] Bluetooth: Configure codec for HFP offload use case

For HFP offload use case, codec needs to be configured
before opening SCO connection. This patch sends
HCI_CONFIGURE_DATA_PATH command to configure doec before
opening SCO connection.

Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 include/net/bluetooth/hci.h      |  8 +++++++
 include/net/bluetooth/hci_core.h |  3 +++
 net/bluetooth/hci_conn.c         |  4 ++++
 net/bluetooth/hci_request.c      | 47 ++++++++++++++++++++++++++++++++++++++++
 net/bluetooth/hci_request.h      |  2 ++
 5 files changed, 64 insertions(+)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index f03bbdf..63065bc 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -1286,6 +1286,14 @@ struct hci_rp_read_local_oob_ext_data {
 	__u8     rand256[16];
 } __packed;
 
+#define HCI_CONFIGURE_DATA_PATH	0x0c83
+struct hci_op_configure_data_path {
+	__u8	direction;
+	__u8	data_path_id;
+	__u8	vnd_len;
+	__u8	vnd_data[];
+} __packed;
+
 #define HCI_OP_READ_LOCAL_VERSION	0x1001
 struct hci_rp_read_local_version {
 	__u8     status;
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index fdfdd3b..4c6485a 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -620,6 +620,9 @@ struct hci_dev {
 	bool (*prevent_wake)(struct hci_dev *hdev);
 	int (*set_quality_report)(struct hci_dev *hdev, bool enable);
 	int (*get_data_path_id)(struct hci_dev *hdev, __u8 *data_path);
+	int (*get_codec_config_data)(struct hci_dev *hdev, __u8 type,
+				     struct bt_codec *codec, __u8 *vnd_len,
+				     __u8 **vnd_data);
 };
 
 #define HCI_PHY_HANDLE(handle)	(handle & 0xff)
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 5600b04..46fbafe 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -315,6 +315,10 @@ static bool hci_enhanced_setup_sync_conn(struct hci_conn *conn, __u16 handle)
 
 	bt_dev_dbg(hdev, "hcon %p", conn);
 
+	/* for offload use case, codec needs to configured before opening SCO */
+	if (conn->codec.data_path)
+		hci_req_configure_datapath(hdev, &conn->codec);
+
 	conn->state = BT_CONNECT;
 	conn->out = true;
 
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index f156266..47fb665 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -3327,6 +3327,53 @@ bool hci_req_stop_discovery(struct hci_request *req)
 	return ret;
 }
 
+static void config_data_path_complete(struct hci_dev *hdev, u8 status,
+				      u16 opcode)
+{
+	bt_dev_dbg(hdev, "status %u", status);
+}
+
+int hci_req_configure_datapath(struct hci_dev *hdev, struct bt_codec *codec)
+{
+	struct hci_request req;
+	int err;
+	__u8 vnd_len, *vnd_data = NULL;
+	struct hci_op_configure_data_path *cmd = NULL;
+
+	hci_req_init(&req, hdev);
+
+	err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
+					  &vnd_data);
+	if (err < 0)
+		goto error;
+
+	cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
+	if (!cmd) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
+	if (err < 0)
+		goto error;
+
+	cmd->vnd_len = vnd_len;
+	memcpy(cmd->vnd_data, vnd_data, vnd_len);
+
+	cmd->direction = 0x00;
+	hci_req_add(&req, HCI_CONFIGURE_DATA_PATH, sizeof(*cmd) + vnd_len, cmd);
+
+	cmd->direction = 0x01;
+	hci_req_add(&req, HCI_CONFIGURE_DATA_PATH, sizeof(*cmd) + vnd_len, cmd);
+
+	err = hci_req_run(&req, config_data_path_complete);
+error:
+
+	kfree(cmd);
+	kfree(vnd_data);
+	return err;
+}
+
 static int stop_discovery(struct hci_request *req, unsigned long opt)
 {
 	hci_dev_lock(req->hdev);
diff --git a/net/bluetooth/hci_request.h b/net/bluetooth/hci_request.h
index 39ee8a1..aaf6087 100644
--- a/net/bluetooth/hci_request.h
+++ b/net/bluetooth/hci_request.h
@@ -101,6 +101,8 @@ void __hci_req_update_class(struct hci_request *req);
 /* Returns true if HCI commands were queued */
 bool hci_req_stop_discovery(struct hci_request *req);
 
+int hci_req_configure_datapath(struct hci_dev *hdev, struct bt_codec *codec);
+
 static inline void hci_req_update_scan(struct hci_dev *hdev)
 {
 	queue_work(hdev->req_workqueue, &hdev->scan_update);
-- 
2.7.4