[PATCH v2 3/3] Bluetooth: cache local supported codec capabilities

[Kiran K <kiran.k@intel.com>]

Cache the codec information in the driver and this data can
be exposed to user space audio modules via getsockopt

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 v2
  add skb length check before accessing data

 include/net/bluetooth/hci.h      | 11 +++++++++++
 include/net/bluetooth/hci_core.h | 13 ++++++++++++
 net/bluetooth/hci_core.c         | 31 +++++++++++++++++++++++++++++
 net/bluetooth/hci_event.c        | 34 ++++++++++++++++++++++++++++++++
 4 files changed, 89 insertions(+)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 34eb9f4b027f..6b4344639ff7 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -1323,6 +1323,17 @@ struct hci_op_read_local_codec_caps {
 	__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 2c19b02a805d..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;
 
@@ -1843,6 +1852,10 @@ 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
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 230aeedd6d00..578f417d1904 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3561,6 +3561,35 @@ 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)
 {
@@ -3820,6 +3849,7 @@ 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);
@@ -4038,6 +4068,7 @@ 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);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 7ca3535f30de..f9ea3109d620 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1057,6 +1057,36 @@ static void hci_cc_read_local_codecs_v2(struct hci_dev *hdev,
 	}
 }
 
+static void hci_cc_read_local_codec_caps(struct hci_dev *hdev,
+					 struct sk_buff *skb)
+{
+	struct hci_op_read_local_codec_caps *sent;
+	struct hci_rp_read_local_codec_caps *rp;
+
+	if (skb->len < sizeof(*rp))
+		return;
+
+	rp = (void *)skb->data;
+
+	bt_dev_dbg(hdev, "status 0x%2.2x", rp->status);
+
+	if (rp->status)
+		return;
+
+	sent = hci_sent_cmd_data(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS);
+
+	if (!sent)
+		return;
+
+	hci_dev_lock(hdev);
+
+	bt_dev_info(hdev, "Adding Codec. No of caps: %u", rp->num_caps);
+
+	hci_codec_list_add(&hdev->local_codecs, rp, skb->len - 2, sent);
+
+	hci_dev_unlock(hdev);
+}
+
 static void hci_cc_read_clock(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_rp_read_clock *rp = (void *) skb->data;
@@ -3615,6 +3645,10 @@ static void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *skb,
 		hci_cc_read_local_codecs_v2(hdev, skb);
 		break;
 
+	case HCI_OP_READ_LOCAL_CODEC_CAPS:
+		hci_cc_read_local_codec_caps(hdev, skb);
+		break;
+
 	case HCI_OP_READ_FLOW_CONTROL_MODE:
 		hci_cc_read_flow_control_mode(hdev, skb);
 		break;
-- 
2.17.1