Bluetooth: hci_ath: Add ath_vendor_cmd helper

Introduce ath_vendor_cmd function which can be used to
configure 'tags' and patch the firmware.

ATH vendor command has the following format:
| OPCODE (u8) | INDEX (LE16) | DLEN (U8) | DATA (U8 * DLEN) |

BD address configuration tag is at index 0x0001.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c
index 0ccf6bf..5f17ec3 100644 (file)
--- a/drivers/bluetooth/hci_ath.c
+++ b/drivers/bluetooth/hci_ath.c
@@ -50,6 +50,17 @@ struct ath_struct {
        struct work_struct ctxtsw;
 };
 
+#define OP_WRITE_TAG   0x01
+
+#define INDEX_BDADDR   0x01
+
+struct ath_vendor_cmd {
+       __u8 opcode;
+       __le16 index;
+       __u8 len;
+       __u8 data[251];
+} __packed;
+
 static int ath_wakeup_ar3k(struct tty_struct *tty)
 {
        int status = tty->driver->ops->tiocmget(tty);
@@ -144,30 +155,34 @@ static int ath_flush(struct hci_uart *hu)
        return 0;
 }
 
-static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+static int ath_vendor_cmd(struct hci_dev *hdev, uint8_t opcode, uint16_t index,
+                         const void *data, size_t dlen)
 {
        struct sk_buff *skb;
-       u8 buf[10];
-       int err;
-
-       buf[0] = 0x01;
-       buf[1] = 0x01;
-       buf[2] = 0x00;
-       buf[3] = sizeof(bdaddr_t);
-       memcpy(buf + 4, bdaddr, sizeof(bdaddr_t));
-
-       skb = __hci_cmd_sync(hdev, 0xfc0b, sizeof(buf), buf, HCI_INIT_TIMEOUT);
-       if (IS_ERR(skb)) {
-               err = PTR_ERR(skb);
-               BT_ERR("%s: Change address command failed (%d)",
-                      hdev->name, err);
-               return err;
-       }
+       struct ath_vendor_cmd cmd;
+
+       if (dlen > sizeof(cmd.data))
+               return -EINVAL;
+
+       cmd.opcode = opcode;
+       cmd.index = cpu_to_le16(index);
+       cmd.len = dlen;
+       memcpy(cmd.data, data, dlen);
+
+       skb = __hci_cmd_sync(hdev, 0xfc0b, dlen + 4, &cmd, HCI_INIT_TIMEOUT);
+       if (IS_ERR(skb))
+               return PTR_ERR(skb);
        kfree_skb(skb);
 
        return 0;
 }
 
+static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+       return ath_vendor_cmd(hdev, OP_WRITE_TAG, INDEX_BDADDR, bdaddr,
+                             sizeof(*bdaddr));
+}
+
 static int ath_setup(struct hci_uart *hu)
 {
        BT_DBG("hu %p", hu);