rt2x00: Enable LED class support for rt2500usb/rt73usb

Add kerneldoc for vendor request functions in rt2x00usb.
Add asynchroneous vendor request function in rt2x00usb.

With the availability of the asynchroneuous vendor request
we can now enable LED class support for rt2500usb and rt73usb.
Since LED handling is not important, it doesn't really matter
if a register call fails (This solution is better then no
LED class support at all).

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index fc606448908..44ab2167c6e 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -122,6 +122,58 @@ int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 
+static void rt2x00usb_vendor_request_async_complete(struct urb *urb)
+{
+	/*
+	 * We're done with it, descrease usage count and let the
+	 * usb layer delete it as soon as it is done with it.
+	 */
+	usb_put_urb(urb);
+}
+
+int rt2x00usb_vendor_request_async(struct rt2x00_dev *rt2x00dev,
+				   const u8 request, const u16 offset,
+				   const u16 value)
+{
+	struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
+	struct usb_ctrlrequest *ctrl;
+	struct urb *urb;
+	int status;
+
+	urb = usb_alloc_urb(0, GFP_NOIO);
+	if (!urb)
+		return -ENOMEM;
+
+	ctrl = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
+	if (!ctrl) {
+		status = -ENOMEM;
+		goto exit;
+	}
+
+	ctrl->bRequestType= USB_VENDOR_REQUEST_OUT;
+	ctrl->bRequest = request;
+	ctrl->wValue = cpu_to_le16p(&value);
+	ctrl->wIndex = cpu_to_le16p(&offset);
+	ctrl->wLength = 0;
+
+	usb_fill_control_urb(urb, usb_dev, usb_sndctrlpipe(usb_dev, 0),
+			     (unsigned char *)ctrl, NULL, 0,
+			     rt2x00usb_vendor_request_async_complete, NULL);
+
+	status = usb_submit_urb(urb, GFP_ATOMIC);
+	if (!status)
+		goto exit;
+
+	return 0;
+
+exit:
+	usb_put_urb(urb);
+	kfree(ctrl);
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_async);
+
 /*
  * TX data handlers.
  */