drivers/bluetooth/btintel.c

   1 /*
   2  *
   3  *  Bluetooth support for Intel devices
   4  *
   5  *  Copyright (C) 2015  Intel Corporation
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25
  26 #include <net/bluetooth/bluetooth.h>
  27 #include <net/bluetooth/hci_core.h>
  28
  29 #include "btintel.h"
  30
  31 #define VERSION "0.1"
  32
  33 #define BDADDR_INTEL (&(bdaddr_t) {{0x00, 0x8b, 0x9e, 0x19, 0x03, 0x00}})
  34
  35 int btintel_check_bdaddr(struct hci_dev *hdev)
  36 {
  37         struct hci_rp_read_bd_addr *bda;
  38         struct sk_buff *skb;
  39
  40         skb = __hci_cmd_sync(hdev, HCI_OP_READ_BD_ADDR, 0, NULL,
  41                              HCI_INIT_TIMEOUT);
  42         if (IS_ERR(skb)) {
  43                 int err = PTR_ERR(skb);
  44                 BT_ERR("%s: Reading Intel device address failed (%d)",
  45                        hdev->name, err);
  46                 return err;
  47         }
  48
  49         if (skb->len != sizeof(*bda)) {
  50                 BT_ERR("%s: Intel device address length mismatch", hdev->name);
  51                 kfree_skb(skb);
  52                 return -EIO;
  53         }
  54
  55         bda = (struct hci_rp_read_bd_addr *)skb->data;
  56         if (bda->status) {
  57                 BT_ERR("%s: Intel device address result failed (%02x)",
  58                        hdev->name, bda->status);
  59                 kfree_skb(skb);
  60                 return -bt_to_errno(bda->status);
  61         }
  62
  63         /* For some Intel based controllers, the default Bluetooth device
  64          * address 00:03:19:9E:8B:00 can be found. These controllers are
  65          * fully operational, but have the danger of duplicate addresses
  66          * and that in turn can cause problems with Bluetooth operation.
  67          */
  68         if (!bacmp(&bda->bdaddr, BDADDR_INTEL)) {
  69                 BT_ERR("%s: Found Intel default device address (%pMR)",
  70                        hdev->name, &bda->bdaddr);
  71                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
  72         }
  73
  74         kfree_skb(skb);
  75
  76         return 0;
  77 }
  78 EXPORT_SYMBOL_GPL(btintel_check_bdaddr);
  79
  80 int btintel_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
  81 {
  82         struct sk_buff *skb;
  83         int err;
  84
  85         skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
  86         if (IS_ERR(skb)) {
  87                 err = PTR_ERR(skb);
  88                 BT_ERR("%s: Changing Intel device address failed (%d)",
  89                        hdev->name, err);
  90                 return err;
  91         }
  92         kfree_skb(skb);
  93
  94         return 0;
  95 }
  96 EXPORT_SYMBOL_GPL(btintel_set_bdaddr);
  97
  98 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  99 MODULE_DESCRIPTION("Bluetooth support for Intel devices ver " VERSION);
 100 MODULE_VERSION(VERSION);
 101 MODULE_LICENSE("GPL");