Bluetooth: Add HCIUARTSETFLAGS and HCIUARTGETFLAGS ioctls

This patch introduces two new ioctls: HCIUARTSETFLAGS and
HCIUARTGETFLAGS. The only flag available for now is HCI_UART_RAW_DEVICE
which allows to initialize a UART device into RAW mode from userspace.
This is particularly useful for experimenting with Bluetooth controllers
that don't yet have proper support in BlueZ.

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

3 files changed, 20 insertions, 1 deletions

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index e8beffe80b31..a57dbfccb3fb 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -395,6 +395,9 @@ static int hci_uart_register_dev(struct hci_uart *hu)
         if (!reset)
                 set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
 
+        if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
+                set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
+
         if (hci_register_dev(hdev) < 0) {
                 BT_ERR("Can't register HCI device");
                 hci_free_dev(hdev);
@@ -475,6 +478,15 @@ static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
                         return hu->hdev->id;
                 return -EUNATCH;
 
+        case HCIUARTSETFLAGS:
+                if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+                        return -EBUSY;
+                hu->hdev_flags = arg;
+                break;
+
+        case HCIUARTGETFLAGS:
+                return hu->hdev_flags;
+
         default:
                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
                 break;
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index 50113db06b9f..9694d9d60905 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -31,6 +31,8 @@
 #define HCIUARTSETPROTO         _IOW('U', 200, int)
 #define HCIUARTGETPROTO         _IOR('U', 201, int)
 #define HCIUARTGETDEVICE        _IOR('U', 202, int)
+#define HCIUARTSETFLAGS         _IOW('U', 203, int)
+#define HCIUARTGETFLAGS         _IOR('U', 204, int)
 
 /* UART protocols */
 #define HCI_UART_MAX_PROTO      5
@@ -41,6 +43,8 @@
 #define HCI_UART_H4DS   3
 #define HCI_UART_LL     4
 
+#define HCI_UART_RAW_DEVICE     0
+
 struct hci_uart;
 
 struct hci_uart_proto {
@@ -57,6 +61,7 @@ struct hci_uart {
         struct tty_struct       *tty;
         struct hci_dev          *hdev;
         unsigned long           flags;
+        unsigned long           hdev_flags;
 
         struct hci_uart_proto   *proto;
         void                    *priv;
@@ -66,7 +71,7 @@ struct hci_uart {
         spinlock_t              rx_lock;
 };
 
-/* HCI_UART flag bits */
+/* HCI_UART proto flag bits */
 #define HCI_UART_PROTO_SET      0
 
 /* TX states  */
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 547452de5ca2..8ea5e3374507 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -604,6 +604,8 @@ static int ioc_settimeout(unsigned int fd, unsigned int cmd,
 #define HCIUARTSETPROTO         _IOW('U', 200, int)
 #define HCIUARTGETPROTO         _IOR('U', 201, int)
 #define HCIUARTGETDEVICE        _IOR('U', 202, int)
+#define HCIUARTSETFLAGS         _IOW('U', 203, int)
+#define HCIUARTGETFLAGS         _IOR('U', 204, int)
 
 #define BNEPCONNADD     _IOW('B', 200, int)
 #define BNEPCONNDEL     _IOW('B', 201, int)