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>

2 files changed, 51 insertions, 6 deletions

diff --git a/drivers/usb/gadget/ci13xxx_udc.c b/drivers/usb/gadget/ci13xxx_udc.c
index 17526759c9ce..e09178bc1450 100644
--- a/drivers/usb/gadget/ci13xxx_udc.c
+++ b/drivers/usb/gadget/ci13xxx_udc.c
@@ -1784,6 +1784,28 @@ __acquires(mEp->lock)
 }
 
 /**
+ * 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;
-                                udc->remote_wakeup = 1;
-                                err = isr_setup_status_phase(udc);
+                                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;
                         }
diff --git a/drivers/usb/gadget/ci13xxx_udc.h b/drivers/usb/gadget/ci13xxx_udc.h
index 6cfab20db6bd..23707775cb43 100644
--- a/drivers/usb/gadget/ci13xxx_udc.h
+++ b/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 */