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From:   Kiran K <kiran.k@intel.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     Kiran K <kiran.k@intel.com>
Subject: [PATCH v10 06/10] Bluetooth: Allow setting of codec for HFP offload usecase
Date:   Wed, 30 Jun 2021 13:38:03 +0530
Message-Id: <20210630080807.12600-6-kiran.k@intel.com>
In-Reply-To: <20210630080807.12600-1-kiran.k@intel.com>
References: <20210630080807.12600-1-kiran.k@intel.com>
Precedence: bulk

For HFP offload usecase, controller needs to be configured
with codec data and capabilities. This patch uses Bluetooth
SIG defined command HCI_CONFIGURE_DATA_PATH to specify vendor
specific data and allows userspace modules to set the codec
via setsockopt systemcall.

Signed-off-by: Kiran K <kiran.k@intel.com>
Reviewed-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Reviewed-by: Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
---
* changes in v10:
  - patch refactor - having callback definition and usage in the same patch

 include/net/bluetooth/bluetooth.h |   2 +
 include/net/bluetooth/hci.h       |   8 ++
 include/net/bluetooth/hci_core.h  |   3 +
 net/bluetooth/sco.c               | 123 ++++++++++++++++++++++++++++++
 4 files changed, 136 insertions(+)

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 1840756958ce..0e8802d09068 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -173,6 +173,8 @@ struct bt_codecs {
 	struct bt_codec	codecs[];
 } __packed;
 
+#define CODING_FORMAT_CVSD	0x02
+
 __printf(1, 2)
 void bt_info(const char *fmt, ...);
 __printf(1, 2)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 5e4306a46324..ae384b7bf000 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -1250,6 +1250,14 @@ 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 00c97e2ce1fd..ebf42a3ac6cd 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -623,6 +623,9 @@ struct hci_dev {
 	bool (*prevent_wake)(struct hci_dev *hdev);
 #if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
 	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);
 #endif
 };
 
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index ddf9b6bd9ca3..4b6ee0b302d7 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -67,6 +67,7 @@ struct sco_pinfo {
 	__u32		flags;
 	__u16		setting;
 	__u8		cmsg_mask;
+	struct bt_codec codec;
 	struct sco_conn	*conn;
 };
 
@@ -438,6 +439,7 @@ static void __sco_sock_close(struct sock *sk)
 		sock_set_flag(sk, SOCK_ZAPPED);
 		break;
 	}
+
 }
 
 /* Must be called on unlocked socket. */
@@ -499,6 +501,10 @@ static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
 	sk->sk_state    = BT_OPEN;
 
 	sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
+	sco_pi(sk)->codec.id = CODING_FORMAT_CVSD;
+	sco_pi(sk)->codec.cid = 0xffff;
+	sco_pi(sk)->codec.vid = 0xffff;
+	sco_pi(sk)->codec.data_path = 0x00;
 
 	timer_setup(&sk->sk_timer, sco_sock_timeout, 0);
 
@@ -802,6 +808,65 @@ static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
 	return bt_sock_recvmsg(sock, msg, len, flags);
 }
 
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+static int sco_configure_data_path(struct hci_dev *hdev, struct bt_codec *codec)
+{
+	__u8 vnd_len, *vnd_data = NULL;
+	struct hci_op_configure_data_path *cmd = NULL;
+	struct sk_buff *skb;
+	int err;
+
+	err = hdev->get_codec_config_data(hdev, SCO_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;
+	skb = __hci_cmd_sync(hdev, HCI_CONFIGURE_DATA_PATH,
+			     sizeof(*cmd) + vnd_len,
+			     cmd, HCI_INIT_TIMEOUT);
+
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "configure input data path failed (%ld)",
+			   PTR_ERR(skb));
+		goto error;
+	}
+	kfree_skb(skb);
+
+	cmd->direction = 0x01;
+	skb = __hci_cmd_sync(hdev, HCI_CONFIGURE_DATA_PATH,
+			     sizeof(*cmd) + vnd_len,
+			     cmd, HCI_INIT_TIMEOUT);
+
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "configure output data path failed (%ld)",
+			   PTR_ERR(skb));
+		goto error;
+	}
+	kfree_skb(skb);
+
+error:
+	kfree(vnd_data);
+	kfree(cmd);
+	return err;
+}
+#endif
+
 static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 			       sockptr_t optval, unsigned int optlen)
 {
@@ -809,6 +874,11 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 	int len, err = 0;
 	struct bt_voice voice;
 	u32 opt;
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+	struct bt_codecs *codecs;
+	struct hci_dev *hdev;
+	__u8 buffer[255];
+#endif
 
 	BT_DBG("sk %p", sk);
 
@@ -870,6 +940,59 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 			sco_pi(sk)->cmsg_mask &= SCO_CMSG_PKT_STATUS;
 		break;
 
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+	case BT_CODEC:
+		if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
+		    sk->sk_state != BT_CONNECT2) {
+			err = -EINVAL;
+			break;
+		}
+
+		hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src,
+				     BDADDR_BREDR);
+		if (!hdev) {
+			err = -EBADFD;
+			break;
+		}
+
+		if (!hdev->get_codec_config_data) {
+			err = -EOPNOTSUPP;
+			break;
+		}
+
+		if (optlen < sizeof(struct bt_codecs) ||
+		    optlen > sizeof(buffer)) {
+			err = -EINVAL;
+			break;
+		}
+
+		if (copy_from_sockptr(buffer, optval, optlen)) {
+			err = -EFAULT;
+			break;
+		}
+
+		codecs = (void *)buffer;
+
+		if (codecs->num_codecs > 1) {
+			err = -EINVAL;
+			break;
+		}
+
+		/* configure data path only non-HCI data path is selected */
+		if (codecs->codecs[0].data_path) {
+			err = sco_configure_data_path(hdev, &codecs->codecs[0]);
+			if (err < 0)
+				break;
+
+			if (codecs->codecs[0].id == 0xff) {
+				sco_pi(sk)->codec.cid = codecs->codecs[0].cid;
+				sco_pi(sk)->codec.vid = codecs->codecs[0].vid;
+			}
+		}
+		sco_pi(sk)->codec.id = codecs->codecs[0].id;
+		sco_pi(sk)->codec.data_path = codecs->codecs[0].data_path;
+		break;
+#endif
 	default:
 		err = -ENOPROTOOPT;
 		break;
-- 
2.17.1