Bluetooth: Add BT LED off routine for Intel Bluetooth device

From: Tedd Ho-Jeong An <[email protected]>

Some platforms have an issue with BT LED on Intel Bluetooth device which takes 5 seconds to BT LED goes off after BT is turned off.

For Intel Bluetooth device, When there is no active connection and no other RF activity, BT LED is turned off if the device is in low power mode(LPM) which is triggered by USB suspend.

So, when the BT is turned off, it takes 5 seconds (default is 5 seconds) or it doesn't go off if autosuspend is not enabled.

To fix this issue, recently Intel Bluetooth firmware patch had been submitted to turn off the BT LED explicitly with a vendor specific command, and this patch sends the Intel specific HCI command before close the device.

For backward compatibility issue with old firmware, this command was supported before, but internally, it was same as HCI_RESET. So, it won't be the problem even if it doesn't have the latest firmware patch.

---
 drivers/bluetooth/btusb.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

index b876888..f3d5dcf 100644
@@ -2331,6 +2331,23 @@ static int btusb_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
 	return 0;
 }
 
+static int btusb_led_off_intel(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+	long ret;
+
+	skb = __hci_cmd_sync(hdev, 0xfc3f, 0, NULL, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		ret = PTR_ERR(skb);
+		BT_ERR("%s: turning off Intel device LED failed (%ld)",
+		       hdev->name, ret);
+		return ret;
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+
 static int btusb_set_bdaddr_marvell(struct hci_dev *hdev,
 				    const bdaddr_t *bdaddr)
 {

@@ -2709,6 +2726,7 @@ static int btusb_probe(struct usb_interface *intf,
 	if (id->driver_info & BTUSB_INTEL) {
 		hdev->setup = btusb_setup_intel;
 		hdev->set_bdaddr = btusb_set_bdaddr_intel;
+		hdev->led_off = btusb_led_off_intel;
 		set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
 	}
 

1.9.1