Bluetooth: mgmt: Add device disconnect reason

MGMT_EV_DEVICE_DISCONNECTED will now expose the disconnection reason to
userland, distinguishing four possible values:

	0x00	Reason not known or unspecified
	0x01	Connection timeout
	0x02	Connection terminated by local host
	0x03	Connection terminated by remote host

Note that the local/remote distinction just determines which side
terminated the low-level connection, regardless of the disconnection of
the higher-level profiles.

This can sometimes be misleading and thus must be used with care. For
example, some hardware combinations would report a locally initiated
disconnection even if the user turned Bluetooth off in the remote side.

Signed-off-by: Mikel Astiz <mikel.astiz@bmw-carit.de>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

2 files changed, 10 insertions, 1 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 7267dafd7159..1bbc1091748c 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1002,7 +1002,7 @@ int mgmt_device_connected(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
                           u8 addr_type, u32 flags, u8 *name, u8 name_len,
                           u8 *dev_class);
 int mgmt_device_disconnected(struct hci_dev *hdev, bdaddr_t *bdaddr,
-                             u8 link_type, u8 addr_type);
+                             u8 link_type, u8 addr_type, u8 reason);
 int mgmt_disconnect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr,
                            u8 link_type, u8 addr_type, u8 status);
 int mgmt_connect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 4348ee8bda69..1b48effcd973 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -405,7 +405,16 @@ struct mgmt_ev_device_connected {
         __u8    eir[0];
 } __packed;
 
+#define MGMT_DEV_DISCONN_UNKNOWN        0x00
+#define MGMT_DEV_DISCONN_TIMEOUT        0x01
+#define MGMT_DEV_DISCONN_LOCAL_HOST     0x02
+#define MGMT_DEV_DISCONN_REMOTE         0x03
+
 #define MGMT_EV_DEVICE_DISCONNECTED     0x000C
+struct mgmt_ev_device_disconnected {
+        struct mgmt_addr_info addr;
+        __u8    reason;
+} __packed;
 
 #define MGMT_EV_CONNECT_FAILED          0x000D
 struct mgmt_ev_connect_failed {