[Bluetooth] Integrate low-level connections into the driver model

This patch integrates the low-level connections (ACL and SCO) into the
driver model. Every connection is presented as device with the parent
set to its host controller device.

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

2 files changed, 84 insertions, 3 deletions

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 420ed4d7e57..7e9515b41cc 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -179,6 +179,8 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
         if (hdev->notify)
                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 
+        hci_conn_add_sysfs(conn);
+
         tasklet_enable(&hdev->tx_task);
 
         return conn;
@@ -211,6 +213,8 @@ int hci_conn_del(struct hci_conn *conn)
 
         tasklet_disable(&hdev->tx_task);
 
+        hci_conn_del_sysfs(conn);
+
         hci_conn_hash_del(hdev, conn);
         if (hdev->notify)
                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
@@ -221,7 +225,9 @@ int hci_conn_del(struct hci_conn *conn)
 
         hci_dev_put(hdev);
 
-        kfree(conn);
+        /* will free via device release */
+        put_device(&conn->dev);
+
         return 0;
 }
 
diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 3ccb4b0b8fc..58df4360d24 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -170,6 +170,32 @@ static struct device_attribute *bt_attrs[] = {
         NULL
 };
 
+static ssize_t show_conn_type(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct hci_conn *conn = dev_get_drvdata(dev);
+        return sprintf(buf, "%s\n", conn->type == ACL_LINK ? "ACL" : "SCO");
+}
+
+static ssize_t show_conn_address(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct hci_conn *conn = dev_get_drvdata(dev);
+        bdaddr_t bdaddr;
+        baswap(&bdaddr, &conn->dst);
+        return sprintf(buf, "%s\n", batostr(&bdaddr));
+}
+
+#define CONN_ATTR(_name,_mode,_show,_store) \
+struct device_attribute conn_attr_##_name = __ATTR(_name,_mode,_show,_store)
+
+static CONN_ATTR(type, S_IRUGO, show_conn_type, NULL);
+static CONN_ATTR(address, S_IRUGO, show_conn_address, NULL);
+
+static struct device_attribute *conn_attrs[] = {
+        &conn_attr_type,
+        &conn_attr_address,
+        NULL
+};
+
 struct class *bt_class = NULL;
 EXPORT_SYMBOL_GPL(bt_class);
 
@@ -181,8 +207,57 @@ static struct platform_device *bt_platform;
 
 static void bt_release(struct device *dev)
 {
-        struct hci_dev *hdev = dev_get_drvdata(dev);
-        kfree(hdev);
+        void *data = dev_get_drvdata(dev);
+        kfree(data);
+}
+
+static void add_conn(void *data)
+{
+        struct hci_conn *conn = data;
+        int i;
+
+        device_register(&conn->dev);
+
+        for (i = 0; conn_attrs[i]; i++)
+                device_create_file(&conn->dev, conn_attrs[i]);
+}
+
+void hci_conn_add_sysfs(struct hci_conn *conn)
+{
+        struct hci_dev *hdev = conn->hdev;
+        bdaddr_t *ba = &conn->dst;
+
+        BT_DBG("conn %p", conn);
+
+        conn->dev.parent  = &hdev->dev;
+        conn->dev.release = bt_release;
+
+        snprintf(conn->dev.bus_id, BUS_ID_SIZE,
+                        "%s%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X",
+                        conn->type == ACL_LINK ? "acl" : "sco",
+                        ba->b[5], ba->b[4], ba->b[3],
+                        ba->b[2], ba->b[1], ba->b[0]);
+
+        dev_set_drvdata(&conn->dev, conn);
+
+        INIT_WORK(&conn->work, add_conn, (void *) conn);
+
+        schedule_work(&conn->work);
+}
+
+static void del_conn(void *data)
+{
+        struct hci_conn *conn = data;
+        device_del(&conn->dev);
+}
+
+void hci_conn_del_sysfs(struct hci_conn *conn)
+{
+        BT_DBG("conn %p", conn);
+
+        INIT_WORK(&conn->work, del_conn, (void *) conn);
+
+        schedule_work(&conn->work);
 }
 
 int hci_register_sysfs(struct hci_dev *hdev)