[Bluetooth] Add notify callback for host drivers

This patch adds a notification callback to the hci_dev structure which
is used by the HCI core to tell the driver about connection creation
and clearing. It also notifies about changed voice setting.

include/net/bluetooth/hci.h

@@ -42,6 +42,11 @@
 #define HCI_DEV_SUSPEND			5
 #define HCI_DEV_RESUME			6
 
+/* HCI notify events */
+#define HCI_NOTIFY_CONN_ADD		1
+#define HCI_NOTIFY_CONN_DEL		2
+#define HCI_NOTIFY_VOICE_SETTING	3
+
 /* HCI device types */
 #define HCI_VHCI	0
 #define HCI_USB		1

include/net/bluetooth/hci_core.h

@@ -130,6 +130,7 @@ struct hci_dev {
 	int (*flush)(struct hci_dev *hdev);
 	int (*send)(struct sk_buff *skb);
 	void (*destruct)(struct hci_dev *hdev);
+	void (*notify)(struct hci_dev *hdev, unsigned int evt);
 	int (*ioctl)(struct hci_dev *hdev, unsigned int cmd, unsigned long arg);
 };
 

net/bluetooth/hci_conn.c

@@ -170,6 +170,9 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 	hci_conn_hash_add(hdev, conn);
 	tasklet_enable(&hdev->tx_task);
 
+	if (hdev->notify)
+		hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
+
 	return conn;
 }
 
@@ -196,6 +199,9 @@ int hci_conn_del(struct hci_conn *conn)
 		hdev->acl_cnt += conn->sent;
 	}
 
+	if (hdev->notify)
+		hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
+
 	tasklet_disable(&hdev->tx_task);
 	hci_conn_hash_del(hdev, conn);
 	tasklet_enable(&hdev->tx_task);

net/bluetooth/hci_event.c

@@ -232,6 +232,9 @@ static void hci_cc_host_ctl(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb
 			hdev->voice_setting = setting;
 
 			BT_DBG("%s: voice setting 0x%04x", hdev->name, setting);
+
+			if (hdev->notify)
+				hdev->notify(hdev, HCI_NOTIFY_VOICE_SETTING);
 		}
 		break;
 
@@ -247,6 +250,9 @@ static void hci_cc_host_ctl(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb
 			hdev->voice_setting = setting;
 
 			BT_DBG("%s: voice setting 0x%04x", hdev->name, setting);
+
+			if (hdev->notify)
+				hdev->notify(hdev, HCI_NOTIFY_VOICE_SETTING);
 		}
 		hci_req_complete(hdev, status);
 		break;