[Bluetooth] Integrate services into the driver model

This patch integrates the services of the Bluetooth protocols RFCOMM,
BNEP and HIDP into the driver model. This makes it possible to assign
the virtual TTY, network and input devices to a specific Bluetooth
connection.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

3 files changed, 67 insertions, 3 deletions

diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index e620061fb50fd..2312d050eeedf 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -51,6 +51,7 @@
 #include <asm/unaligned.h>
 
 #include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
 #include <net/bluetooth/l2cap.h>
 
 #include "bnep.h"
@@ -515,6 +516,26 @@ static int bnep_session(void *arg)
 	return 0;
 }
 
+static struct device *bnep_get_device(struct bnep_session *session)
+{
+	bdaddr_t *src = &bt_sk(session->sock->sk)->src;
+	bdaddr_t *dst = &bt_sk(session->sock->sk)->dst;
+	struct hci_dev *hdev;
+	struct hci_conn *conn;
+
+	hdev = hci_get_route(dst, src);
+	if (!hdev)
+		return NULL;
+
+	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
+	if (!conn)
+		return NULL;
+
+	hci_dev_put(hdev);
+
+	return &conn->dev;
+}
+
 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 {
 	struct net_device *dev;
@@ -534,7 +555,6 @@ int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 	if (!dev)
 		return -ENOMEM;
 
-
 	down_write(&bnep_session_sem);
 
 	ss = __bnep_get_session(dst);
@@ -551,7 +571,7 @@ int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 	memcpy(s->eh.h_source, &dst, ETH_ALEN);
 	memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
 
-	s->dev = dev;
+	s->dev   = dev;
 	s->sock  = sock;
 	s->role  = req->role;
 	s->state = BT_CONNECTED;
@@ -568,6 +588,8 @@ int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 	bnep_set_default_proto_filter(s);
 #endif
 
+	SET_NETDEV_DEV(dev, bnep_get_device(s));
+
 	err = register_netdev(dev);
 	if (err) {
 		goto failed;
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index c6e3a2c27c6ec..03b5dadb49511 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -40,6 +40,7 @@
 #include <linux/input.h>
 
 #include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
 #include <net/bluetooth/l2cap.h>
 
 #include "hidp.h"
@@ -528,6 +529,26 @@ static int hidp_session(void *arg)
 	return 0;
 }
 
+static struct device *hidp_get_device(struct hidp_session *session)
+{
+	bdaddr_t *src = &bt_sk(session->ctrl_sock->sk)->src;
+	bdaddr_t *dst = &bt_sk(session->ctrl_sock->sk)->dst;
+	struct hci_dev *hdev;
+	struct hci_conn *conn;
+
+	hdev = hci_get_route(dst, src);
+	if (!hdev)
+		return NULL;
+
+	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
+	if (!conn)
+		return NULL;
+
+	hci_dev_put(hdev);
+
+	return &conn->dev;
+}
+
 static inline void hidp_setup_input(struct hidp_session *session, struct hidp_connadd_req *req)
 {
 	struct input_dev *input = session->input;
@@ -566,6 +587,8 @@ static inline void hidp_setup_input(struct hidp_session *session, struct hidp_co
 		input->relbit[0] |= BIT(REL_WHEEL);
 	}
 
+	input->cdev.dev = hidp_get_device(session);
+
 	input->event = hidp_input_event;
 
 	input_register_device(input);
diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index bd8d671a0ba6f..26f322737db0c 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -38,6 +38,7 @@
 #include <linux/skbuff.h>
 
 #include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
 #include <net/bluetooth/rfcomm.h>
 
 #ifndef CONFIG_BT_RFCOMM_DEBUG
@@ -161,6 +162,24 @@ static inline struct rfcomm_dev *rfcomm_dev_get(int id)
 	return dev;
 }
 
+static struct device *rfcomm_get_device(struct rfcomm_dev *dev)
+{
+	struct hci_dev *hdev;
+	struct hci_conn *conn;
+
+	hdev = hci_get_route(&dev->dst, &dev->src);
+	if (!hdev)
+		return NULL;
+
+	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
+	if (!conn)
+		return NULL;
+
+	hci_dev_put(hdev);
+
+	return &conn->dev;
+}
+
 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 {
 	struct rfcomm_dev *dev;
@@ -244,7 +263,7 @@ out:
 		return err;
 	}
 
-	tty_register_device(rfcomm_tty_driver, dev->id, NULL);
+	tty_register_device(rfcomm_tty_driver, dev->id, rfcomm_get_device(dev));
 
 	return dev->id;
 }