[Bluetooth] Add HCIUARTGETDEVICE support for HCI line discipline

Adding HCIUARTGETDEVICE makes it possible to get the HCI device number
that is attached to a given serial device. This is required during the
initialization process of some Bluetooth chips.

Signed-off-by: Ohad Ben-Cohen <ohad@bencohen.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 8 insertions, 2 deletions

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 0f4203b499af..75c15085f81f 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -479,6 +479,11 @@ static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
                         return hu->proto->id;
                 return -EUNATCH;
 
+        case HCIUARTGETDEVICE:
+                if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+                        return hu->hdev->id;
+                return -EUNATCH;
+
         default:
                 err = n_tty_ioctl(tty, file, cmd, arg);
                 break;
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index b250e6789dee..1097ce72393f 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -28,8 +28,9 @@
 #endif
 
 /* Ioctls */
-#define HCIUARTSETPROTO _IOW('U', 200, int)
-#define HCIUARTGETPROTO _IOR('U', 201, int)
+#define HCIUARTSETPROTO         _IOW('U', 200, int)
+#define HCIUARTGETPROTO         _IOR('U', 201, int)
+#define HCIUARTGETDEVICE        _IOR('U', 202, int)
 
 /* UART protocols */
 #define HCI_UART_MAX_PROTO      4