Bluetooth: Expose current Device ID information via debugfs

For debugging purposes it is good to be able to read the current
configured Device ID details.

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

1 files changed, 26 insertions, 0 deletions

diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c
index e6255833a258..7db4220941cc 100644
--- a/net/bluetooth/hci_debugfs.c
+++ b/net/bluetooth/hci_debugfs.c
@@ -114,6 +114,30 @@ static const struct file_operations features_fops = {
         .release        = single_release,
 };
 
+static int device_id_show(struct seq_file *f, void *ptr)
+{
+        struct hci_dev *hdev = f->private;
+
+        hci_dev_lock(hdev);
+        seq_printf(f, "%4.4x:%4.4x:%4.4x:%4.4x\n", hdev->devid_source,
+                  hdev->devid_vendor, hdev->devid_product, hdev->devid_version);
+        hci_dev_unlock(hdev);
+
+        return 0;
+}
+
+static int device_id_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, device_id_show, inode->i_private);
+}
+
+static const struct file_operations device_id_fops = {
+        .open           = device_id_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 static int device_list_show(struct seq_file *f, void *ptr)
 {
         struct hci_dev *hdev = f->private;
@@ -335,6 +359,8 @@ void hci_debugfs_create_common(struct hci_dev *hdev)
         debugfs_create_u16("hci_revision", 0444, hdev->debugfs, &hdev->hci_rev);
         debugfs_create_u8("hardware_error", 0444, hdev->debugfs,
                           &hdev->hw_error_code);
+        debugfs_create_file("device_id", 0444, hdev->debugfs, hdev,
+                            &device_id_fops);
 
         debugfs_create_file("device_list", 0444, hdev->debugfs, hdev,
                             &device_list_fops);