[PATCH 2/3] Bluetooth: Add hook for driver to prevent wake from suspend

[Abhishek Pandit-Subedi]

Let drivers have a hook to disable configuring scanning during suspend.
Drivers should use the device_may_wakeup function call to determine
whether hci should be configured for wakeup.

For example, an implementation for btusb may look like the following:

  bool btusb_prevent_wake(struct hci_dev *hdev)
  {
        struct btusb_data *data = hci_get_drvdata(hdev);
        return !device_may_wakeup(&data->udev->dev);
  }

Signed-off-by: Abhishek Pandit-Subedi <abhishekpan...@chromium.org>
Reviewed-by: Alain Michaud <ala...@chromium.org>
---

 include/net/bluetooth/hci_core.h | 1 +
 net/bluetooth/hci_core.c         | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 869ee2b30a4c1..5dcf85f186c6c 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -503,6 +503,7 @@ struct hci_dev {
        int (*set_diag)(struct hci_dev *hdev, bool enable);
        int (*set_bdaddr)(struct hci_dev *hdev, const bdaddr_t *bdaddr);
        void (*cmd_timeout)(struct hci_dev *hdev);
+       bool (*prevent_wake)(struct hci_dev *hdev);
 };
 
 #define HCI_PHY_HANDLE(handle) (handle & 0xff)
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index de1f4e72ec065..dbe2d79f233fb 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3350,8 +3350,10 @@ static int hci_suspend_notifier(struct notifier_block 
*nb, unsigned long action,
                 */
                ret = hci_change_suspend_state(hdev, BT_SUSPEND_DISCONNECT);
 
-               /* Only configure whitelist if disconnect succeeded */
-               if (!ret)
+               /* Only configure whitelist if disconnect succeeded and wake
+                * isn't being prevented.
+                */
+               if (!ret && !(hdev->prevent_wake && hdev->prevent_wake(hdev)))
                        ret = hci_change_suspend_state(hdev,
                                                BT_SUSPEND_CONFIGURE_WAKE);
        } else if (action == PM_POST_SUSPEND) {
-- 
2.26.2.645.ge9eca65c58-goog