Bluetooth: Add debugfs switch for forcing SMP over BR/EDR
To make it possible to use LE SC functionality over BR/EDR with pre-4.1
controllers (that do not support BR/EDR SC links) it's useful to be able
to force LE SC operations even over a traditional SSP protected link.
This patch adds a debugfs switch to force a special debug flag which is
used to skip the checks for BR/EDR SC support.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2fa9f2b..581e13e 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -406,6 +406,49 @@
.llseek = default_llseek,
};
+static ssize_t force_lesc_support_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct hci_dev *hdev = file->private_data;
+ char buf[3];
+
+ buf[0] = test_bit(HCI_FORCE_LESC, &hdev->dbg_flags) ? 'Y': 'N';
+ buf[1] = '\n';
+ buf[2] = '\0';
+ return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t force_lesc_support_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct hci_dev *hdev = file->private_data;
+ char buf[32];
+ size_t buf_size = min(count, (sizeof(buf)-1));
+ bool enable;
+
+ if (copy_from_user(buf, user_buf, buf_size))
+ return -EFAULT;
+
+ buf[buf_size] = '\0';
+ if (strtobool(buf, &enable))
+ return -EINVAL;
+
+ if (enable == test_bit(HCI_FORCE_LESC, &hdev->dbg_flags))
+ return -EALREADY;
+
+ change_bit(HCI_FORCE_LESC, &hdev->dbg_flags);
+
+ return count;
+}
+
+static const struct file_operations force_lesc_support_fops = {
+ .open = simple_open,
+ .read = force_lesc_support_read,
+ .write = force_lesc_support_write,
+ .llseek = default_llseek,
+};
+
static ssize_t sc_only_mode_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
@@ -1817,6 +1860,10 @@
hdev, &force_sc_support_fops);
debugfs_create_file("sc_only_mode", 0444, hdev->debugfs,
hdev, &sc_only_mode_fops);
+ if (lmp_le_capable(hdev))
+ debugfs_create_file("force_lesc_support", 0644,
+ hdev->debugfs, hdev,
+ &force_lesc_support_fops);
}
if (lmp_sniff_capable(hdev)) {