USB: gadget: Add test mode support for ci13xxx_udc

Implement the test modes mentioned in 7.1.20 section of USB 2.0
specification.  High-speed capable devices must support these test
modes to facilitate compliance testing.
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/ci13xxx_udc.c

@@ -1783,6 +1783,28 @@ __acquires(mEp->lock)
 	return retval;
 }
 
+/**
+ * isr_setup_status_complete: setup_status request complete function
+ * @ep:  endpoint
+ * @req: request handled
+ *
+ * Caller must release lock. Put the port in test mode if test mode
+ * feature is selected.
+ */
+static void
+isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct ci13xxx *udc = req->context;
+	unsigned long flags;
+
+	trace("%p, %p", ep, req);
+
+	spin_lock_irqsave(udc->lock, flags);
+	if (udc->test_mode)
+		hw_port_test_set(udc->test_mode);
+	spin_unlock_irqrestore(udc->lock, flags);
+}
+
 /**
  * isr_setup_status_phase: queues the status phase of a setup transation
  * @udc: udc struct
@@ -1799,6 +1821,8 @@ __acquires(mEp->lock)
 	trace("%p", udc);
 
 	mEp = (udc->ep0_dir == TX) ? &udc->ep0out : &udc->ep0in;
+	udc->status->context = udc;
+	udc->status->complete = isr_setup_status_complete;
 
 	spin_unlock(mEp->lock);
 	retval = usb_ep_queue(&mEp->ep, udc->status, GFP_ATOMIC);
@@ -1859,6 +1883,7 @@ __releases(udc->lock)
 __acquires(udc->lock)
 {
 	unsigned i;
+	u8 tmode = 0;
 
 	trace("%p", udc);
 
@@ -1982,14 +2007,33 @@ __acquires(udc->lock)
 				err = usb_ep_set_halt(&udc->ci13xxx_ep[num].ep);
 				spin_lock(udc->lock);
 				if (!err)
-					err = isr_setup_status_phase(udc);
-			} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
-					le16_to_cpu(req.wValue) ==
-					USB_DEVICE_REMOTE_WAKEUP) {
+					isr_setup_status_phase(udc);
+			} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
 				if (req.wLength != 0)
 					break;
+				switch (le16_to_cpu(req.wValue)) {
+				case USB_DEVICE_REMOTE_WAKEUP:
 					udc->remote_wakeup = 1;
 					err = isr_setup_status_phase(udc);
+					break;
+				case USB_DEVICE_TEST_MODE:
+					tmode = le16_to_cpu(req.wIndex) >> 8;
+					switch (tmode) {
+					case TEST_J:
+					case TEST_K:
+					case TEST_SE0_NAK:
+					case TEST_PACKET:
+					case TEST_FORCE_EN:
+						udc->test_mode = tmode;
+						err = isr_setup_status_phase(
+								udc);
+						break;
+					default:
+						break;
+					}
+				default:
+					goto delegate;
+				}
 			} else {
 				goto delegate;
 			}

drivers/usb/gadget/ci13xxx_udc.h

@@ -131,6 +131,7 @@ struct ci13xxx {
 	u8                         remote_wakeup; /* Is remote wakeup feature
 							enabled by the host? */
 	u8                         suspended;  /* suspended by the host */
+	u8                         test_mode;  /* the selected test mode */
 
 	struct usb_gadget_driver  *driver;     /* 3rd party gadget driver */
 	struct ci13xxx_udc_driver *udc_driver; /* device controller driver */