[Bluetooth] Add suspend/resume support to the HCI USB driver

This patch implements the suspend/resume methods for the HCI USB
driver by killing all outstanding URBs on suspend, and re-issuing
them on resume.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/drivers/bluetooth/hci_usb.c b/drivers/bluetooth/hci_usb.c
index 95afce1cb465..987a3dff8af9 100644
--- a/drivers/bluetooth/hci_usb.c
+++ b/drivers/bluetooth/hci_usb.c
@@ -1045,10 +1045,81 @@ static void hci_usb_disconnect(struct usb_interface *intf)
         hci_free_dev(hdev);
 }
 
+static int hci_usb_suspend(struct usb_interface *intf, pm_message_t message)
+{
+        struct hci_usb *husb = usb_get_intfdata(intf);
+        struct list_head killed;
+        unsigned long flags;
+        int i;
+
+        if (!husb || intf == husb->isoc_iface)
+                return 0;
+
+        hci_suspend_dev(husb->hdev);
+
+        INIT_LIST_HEAD(&killed);
+
+        for (i = 0; i < 4; i++) {
+                struct _urb_queue *q = &husb->pending_q[i];
+                struct _urb *_urb, *_tmp;
+
+                while ((_urb = _urb_dequeue(q))) {
+                        /* reset queue since _urb_dequeue sets it to NULL */
+                        _urb->queue = q;
+                        usb_kill_urb(&_urb->urb);
+                        list_add(&_urb->list, &killed);
+                }
+
+                spin_lock_irqsave(&q->lock, flags);
+
+                list_for_each_entry_safe(_urb, _tmp, &killed, list) {
+                        list_move_tail(&_urb->list, &q->head);
+                }
+
+                spin_unlock_irqrestore(&q->lock, flags);
+        }
+
+        return 0;
+}
+
+static int hci_usb_resume(struct usb_interface *intf)
+{
+        struct hci_usb *husb = usb_get_intfdata(intf);
+        unsigned long flags;
+        int i, err = 0;
+
+        if (!husb || intf == husb->isoc_iface)
+                return 0;
+        
+        for (i = 0; i < 4; i++) {
+                struct _urb_queue *q = &husb->pending_q[i];
+                struct _urb *_urb;
+
+                spin_lock_irqsave(&q->lock, flags);
+
+                list_for_each_entry(_urb, &q->head, list) {
+                        err = usb_submit_urb(&_urb->urb, GFP_ATOMIC);
+                        if (err)
+                                break;
+                }
+
+                spin_unlock_irqrestore(&q->lock, flags);
+
+                if (err)
+                        return -EIO;
+        }
+
+        hci_resume_dev(husb->hdev);
+
+        return 0;
+}
+
 static struct usb_driver hci_usb_driver = {
         .name           = "hci_usb",
         .probe          = hci_usb_probe,
         .disconnect     = hci_usb_disconnect,
+        .suspend        = hci_usb_suspend,
+        .resume         = hci_usb_resume,
         .id_table       = bluetooth_ids,
 };