[PATCH] hci_usb: implement suspend/resume

Johannes Berg
2006-01-18T12:41:15Z

The attached patch implements suspend/resume for the hci_usb bluetooth
driver by simply killing all outstanding urbs on suspend, and re-issuing
them on resume.

This allows me to actually use the internal bluetooth "dongle" in my
powerbook after suspend-to-ram without taking down all userland programs
(sdpd, ...) and the hci device and reloading the module.

Signed-Off-By: Johannes Berg <johannes@sipsolutions.net>

--- linux-2.6.15.1.orig/drivers/bluetooth/hci_usb.c 2006-01-18 00:08:54.840000000 +0100
+++ linux-2.6.15.1/drivers/bluetooth/hci_usb.c 2006-01-18 00:06:35.080000000 +0100
@@ -1043,11 +1043,55 @@
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);
+ int i;
+ unsigned long flags;
+ 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)
+ usb_kill_urb(&_urb->urb);
+ 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);
+ int i, err;
+ unsigned long flags;
+ 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;
+ }
+ return 0;
+}
+
static struct usb_driver hci_usb_driver = {
.owner = THIS_MODULE,
.name = "hci_usb",
.probe = hci_usb_probe,
.disconnect = hci_usb_disconnect,
+ .suspend = hci_usb_suspend,
+ .resume = hci_usb_resume,
.id_table = bluetooth_ids,
};