Bluetooth: Expose debugfs settings for LE connection interval

For testing purposes expose the default LE connection interval values
via debugfs.

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

2 files changed, 65 insertions, 2 deletions

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 974d7bccbb6f..ba5366c320da 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -558,11 +558,12 @@ static int hci_create_le_conn(struct hci_conn *conn)
         bacpy(&cp.peer_addr, &conn->dst);
         cp.peer_addr_type = conn->dst_type;
         cp.own_address_type = conn->src_type;
-        cp.conn_interval_min = __constant_cpu_to_le16(0x0028);
-        cp.conn_interval_max = __constant_cpu_to_le16(0x0038);
+        cp.conn_interval_min = cpu_to_le16(hdev->le_conn_min_interval);
+        cp.conn_interval_max = cpu_to_le16(hdev->le_conn_max_interval);
         cp.supervision_timeout = __constant_cpu_to_le16(0x002a);
         cp.min_ce_len = __constant_cpu_to_le16(0x0000);
         cp.max_ce_len = __constant_cpu_to_le16(0x0000);
+
         hci_req_add(&req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 
         err = hci_req_run(&req, create_le_conn_complete);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2a9e92503fd6..8149e1303e2b 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -517,6 +517,62 @@ static const struct file_operations long_term_keys_fops = {
         .release        = single_release,
 };
 
+static int conn_min_interval_set(void *data, u64 val)
+{
+        struct hci_dev *hdev = data;
+
+        if (val < 0x0006 || val > 0x0c80 || val > hdev->le_conn_max_interval)
+                return -EINVAL;
+
+        hci_dev_lock(hdev);
+        hdev->le_conn_min_interval= val;
+        hci_dev_unlock(hdev);
+
+        return 0;
+}
+
+static int conn_min_interval_get(void *data, u64 *val)
+{
+        struct hci_dev *hdev = data;
+
+        hci_dev_lock(hdev);
+        *val = hdev->le_conn_min_interval;
+        hci_dev_unlock(hdev);
+
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(conn_min_interval_fops, conn_min_interval_get,
+                        conn_min_interval_set, "%llu\n");
+
+static int conn_max_interval_set(void *data, u64 val)
+{
+        struct hci_dev *hdev = data;
+
+        if (val < 0x0006 || val > 0x0c80 || val < hdev->le_conn_min_interval)
+                return -EINVAL;
+
+        hci_dev_lock(hdev);
+        hdev->le_conn_max_interval= val;
+        hci_dev_unlock(hdev);
+
+        return 0;
+}
+
+static int conn_max_interval_get(void *data, u64 *val)
+{
+        struct hci_dev *hdev = data;
+
+        hci_dev_lock(hdev);
+        *val = hdev->le_conn_max_interval;
+        hci_dev_unlock(hdev);
+
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(conn_max_interval_fops, conn_max_interval_get,
+                        conn_max_interval_set, "%llu\n");
+
 /* ---- HCI requests ---- */
 
 static void hci_req_sync_complete(struct hci_dev *hdev, u8 result)
@@ -1273,6 +1329,10 @@ static int __hci_init(struct hci_dev *hdev)
                                     hdev, &own_address_type_fops);
                 debugfs_create_file("long_term_keys", 0400, hdev->debugfs,
                                     hdev, &long_term_keys_fops);
+                debugfs_create_file("conn_min_interval", 0644, hdev->debugfs,
+                                    hdev, &conn_min_interval_fops);
+                debugfs_create_file("conn_max_interval", 0644, hdev->debugfs,
+                                    hdev, &conn_max_interval_fops);
         }
 
         return 0;
@@ -2738,6 +2798,8 @@ struct hci_dev *hci_alloc_dev(void)
 
         hdev->le_scan_interval = 0x0060;
         hdev->le_scan_window = 0x0030;
+        hdev->le_conn_min_interval = 0x0028;
+        hdev->le_conn_max_interval = 0x0038;
 
         mutex_init(&hdev->lock);
         mutex_init(&hdev->req_lock);