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From:   Kiran K <kiran.k@intel.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     Kiran K <kiran.k@intel.com>,
        Chethan T N <chethan.tumkur.narayan@intel.com>,
        Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
Subject: [PATCH v4 1/2] Bluetooth: enumerate local supported codec and cache details
Date:   Wed, 28 Apr 2021 19:31:31 +0530
Message-Id: <20210428140132.30316-1-kiran.k@intel.com>
Precedence: bulk

Move reading of supported local codecs into a separate init function,
query codecs capabilities and cache the data

Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Signed-off-by: Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
---
* changes in v4
  - convert  reading of codecs and codecs caps calls from async to sync
* changes in v3
  move codec enumeration into a new init function
* changes in v2
  add skb length check before accessing data

 include/net/bluetooth/hci.h      |  18 ++++
 include/net/bluetooth/hci_core.h |  23 +++++
 net/bluetooth/hci_core.c         | 144 ++++++++++++++++++++++++++++++-
 3 files changed, 181 insertions(+), 4 deletions(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index ea4ae551c426..2f7f8c6f7d63 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -1314,6 +1314,24 @@ struct hci_rp_read_local_pairing_opts {
 	__u8     max_key_size;
 } __packed;
 
+#define HCI_OP_READ_LOCAL_CODEC_CAPS	0x100e
+struct hci_op_read_local_codec_caps {
+	__u8	codec_id[5];
+	__u8	transport;
+	__u8	direction;
+} __packed;
+
+struct hci_codec_caps {
+	__u8	len;
+	__u8	caps[];
+} __packed;
+
+struct hci_rp_read_local_codec_caps {
+	__u8	status;
+	__u8	num_caps;
+	struct hci_codec_caps caps[];
+} __packed;
+
 #define HCI_OP_READ_PAGE_SCAN_ACTIVITY	0x0c1b
 struct hci_rp_read_page_scan_activity {
 	__u8     status;
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 8f5f390363f5..b40c7ed38d18 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -131,6 +131,14 @@ struct bdaddr_list {
 	u8 bdaddr_type;
 };
 
+struct codec_list {
+	struct list_head list;
+	u8	transport;
+	u8	codec_id[5];
+	u8	num_caps;
+	struct hci_codec_caps caps[];
+};
+
 struct bdaddr_list_with_irk {
 	struct list_head list;
 	bdaddr_t bdaddr;
@@ -534,6 +542,7 @@ struct hci_dev {
 	struct list_head	pend_le_conns;
 	struct list_head	pend_le_reports;
 	struct list_head	blocked_keys;
+	struct list_head	local_codecs;
 
 	struct hci_dev_stats	stat;
 
@@ -1843,9 +1852,23 @@ void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 
 void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr,
 			       u8 *bdaddr_type);
+int hci_codec_list_add(struct list_head *list, struct hci_rp_read_local_codec_caps *rp,
+		       __u32 len,
+		       struct hci_op_read_local_codec_caps *sent);
+void hci_codec_list_clear(struct list_head *codec_list);
 
 #define SCO_AIRMODE_MASK       0x0003
 #define SCO_AIRMODE_CVSD       0x0000
 #define SCO_AIRMODE_TRANSP     0x0003
 
+#define LOCAL_CODEC_ACL_MASK	BIT(0)
+#define LOCAL_CODEC_SCO_MASK	BIT(1)
+#define LOCAL_CODEC_CIS_MASK	BIT(2)
+#define LOCAL_CODEC_BIS_MASK	BIT(3)
+
+#define LOCAL_CODEC_ACL		0x00
+#define LOCAL_CODEC_SCO		0x01
+#define LOCAL_CODEC_CIS		0x02
+#define LOCAL_CODEC_BIS		0x03
+
 #endif /* __HCI_CORE_H */
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index fd12f1652bdf..7201967b6e9c 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -838,10 +838,6 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt)
 	if (hdev->commands[22] & 0x04)
 		hci_set_event_mask_page_2(req);
 
-	/* Read local codec list if the HCI command is supported */
-	if (hdev->commands[29] & 0x20)
-		hci_req_add(req, HCI_OP_READ_LOCAL_CODECS, 0, NULL);
-
 	/* Read local pairing options if the HCI command is supported */
 	if (hdev->commands[41] & 0x08)
 		hci_req_add(req, HCI_OP_READ_LOCAL_PAIRING_OPTS, 0, NULL);
@@ -907,6 +903,113 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt)
 	return 0;
 }
 
+static void hci_read_codec_capabilities(struct hci_dev *hdev, __u8 *codec_id,
+					__u8 transport, bool is_vendor_codec)
+{
+	struct hci_op_read_local_codec_caps caps;
+	struct hci_rp_read_local_codec_caps *rp;
+	struct sk_buff *skb;
+
+	memset(&caps, 0, sizeof(caps));
+
+	if (is_vendor_codec) {
+		caps.codec_id[0] = 0xFF;
+		memcpy(&caps.codec_id[1], codec_id, 4);
+	} else {
+		caps.codec_id[0] = codec_id[0];
+	}
+
+	caps.direction = 0x00;
+	caps.transport = transport;
+
+	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS, sizeof(caps),
+			     &caps, HCI_CMD_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Failed to read local supported codecs v2 (%ld)",
+			   PTR_ERR(skb));
+		return;
+	}
+
+	if (skb->len < sizeof(*rp))
+		goto error;
+
+	rp = (void *)skb->data;
+
+	if (rp->status)
+		goto error;
+
+	hci_dev_lock(hdev);
+	hci_codec_list_add(&hdev->local_codecs, rp, skb->len - 2, &caps);
+	hci_dev_unlock(hdev);
+
+error:
+	kfree_skb(skb);
+}
+
+static void hci_read_supported_codecs(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+	__u8 num_codecs;
+
+	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS, 0, NULL,
+			     HCI_CMD_TIMEOUT);
+
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
+			   PTR_ERR(skb));
+		return;
+	}
+
+	if (skb->len < 1 || skb->data[0])
+		goto error;
+
+	skb_pull(skb, 1);
+
+	if (skb->len < 1)
+		goto error;
+
+	/* enumerate standard codecs */
+	num_codecs = skb->data[0];
+
+	skb_pull(skb, 1);
+
+	if (num_codecs && skb->len  < num_codecs)
+		goto error;
+
+	while (num_codecs--) {
+		hci_read_codec_capabilities(hdev, skb->data, LOCAL_CODEC_ACL,
+					    false);
+		skb_pull(skb, 1);
+	}
+
+	/* enumerate vendor specific codecs */
+	if (skb->len < 1)
+		goto error;
+
+	num_codecs = skb->data[0];
+
+	skb_pull(skb, 1);
+
+	if (num_codecs && skb->len < (num_codecs * 4))
+		goto error;
+
+	while (num_codecs--) {
+		hci_read_codec_capabilities(hdev, skb->data, LOCAL_CODEC_ACL,
+					    true);
+		skb_pull(skb, 4);
+	}
+
+error:
+	kfree_skb(skb);
+}
+
+static void hci_init5_req(struct hci_dev *hdev)
+{
+	/* Read local codec list if the HCI command is supported */
+	if (hdev->commands[29] & 0x20)
+		hci_read_supported_codecs(hdev);
+}
+
 static int __hci_init(struct hci_dev *hdev)
 {
 	int err;
@@ -937,6 +1040,8 @@ static int __hci_init(struct hci_dev *hdev)
 	if (err < 0)
 		return err;
 
+	hci_init5_req(hdev);
+
 	/* This function is only called when the controller is actually in
 	 * configured state. When the controller is marked as unconfigured,
 	 * this initialization procedure is not run.
@@ -3559,6 +3664,35 @@ void hci_conn_params_clear_disabled(struct hci_dev *hdev)
 	BT_DBG("All LE disabled connection parameters were removed");
 }
 
+int hci_codec_list_add(struct list_head *list, struct hci_rp_read_local_codec_caps *rp,
+		       __u32 len,
+		       struct hci_op_read_local_codec_caps *sent)
+{
+	struct codec_list *entry;
+
+	entry = kzalloc(sizeof(*entry) + len, GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	memcpy(entry->codec_id, sent->codec_id, 5);
+	entry->transport = sent->transport;
+	entry->num_caps = rp->num_caps;
+	if (rp->num_caps)
+		memcpy(entry->caps, rp->caps, len);
+	list_add(&entry->list, list);
+
+	return 0;
+}
+
+void hci_codec_list_clear(struct list_head *codec_list)
+{
+	struct codec_list *c, *n;
+
+	list_for_each_entry_safe(c, n, codec_list, list) {
+		list_del(&c->list);
+		kfree(c);
+	}
+}
 /* This function requires the caller holds hdev->lock */
 static void hci_conn_params_clear_all(struct hci_dev *hdev)
 {
@@ -3818,6 +3952,7 @@ struct hci_dev *hci_alloc_dev(void)
 	INIT_LIST_HEAD(&hdev->conn_hash.list);
 	INIT_LIST_HEAD(&hdev->adv_instances);
 	INIT_LIST_HEAD(&hdev->blocked_keys);
+	INIT_LIST_HEAD(&hdev->local_codecs);
 
 	INIT_WORK(&hdev->rx_work, hci_rx_work);
 	INIT_WORK(&hdev->cmd_work, hci_cmd_work);
@@ -4036,6 +4171,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
 	hci_conn_params_clear_all(hdev);
 	hci_discovery_filter_clear(hdev);
 	hci_blocked_keys_clear(hdev);
+	hci_codec_list_clear(&hdev->local_codecs);
 	hci_dev_unlock(hdev);
 
 	hci_dev_put(hdev);
-- 
2.17.1