Bluetooth: Expose default connection latency setting via debugfs

The controller has a default value for the connection latency. Expose
this via debugfs for testing purposes.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 94551c33c4c6..79d292cfb867 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -851,6 +851,34 @@ static int conn_max_interval_get(void *data, u64 *val)
 DEFINE_SIMPLE_ATTRIBUTE(conn_max_interval_fops, conn_max_interval_get,
                         conn_max_interval_set, "%llu\n");
 
+static int conn_latency_set(void *data, u64 val)
+{
+        struct hci_dev *hdev = data;
+
+        if (val > 0x01f3)
+                return -EINVAL;
+
+        hci_dev_lock(hdev);
+        hdev->le_conn_latency = val;
+        hci_dev_unlock(hdev);
+
+        return 0;
+}
+
+static int conn_latency_get(void *data, u64 *val)
+{
+        struct hci_dev *hdev = data;
+
+        hci_dev_lock(hdev);
+        *val = hdev->le_conn_latency;
+        hci_dev_unlock(hdev);
+
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(conn_latency_fops, conn_latency_get,
+                        conn_latency_set, "%llu\n");
+
 static int adv_channel_map_set(void *data, u64 val)
 {
         struct hci_dev *hdev = data;
@@ -1708,6 +1736,8 @@ static int __hci_init(struct hci_dev *hdev)
                                     hdev, &conn_min_interval_fops);
                 debugfs_create_file("conn_max_interval", 0644, hdev->debugfs,
                                     hdev, &conn_max_interval_fops);
+                debugfs_create_file("conn_latency", 0644, hdev->debugfs,
+                                    hdev, &conn_latency_fops);
                 debugfs_create_file("adv_channel_map", 0644, hdev->debugfs,
                                     hdev, &adv_channel_map_fops);
                 debugfs_create_file("device_list", 0444, hdev->debugfs, hdev,