atmel_usba_udc: Keep track of the device status

Keep track of the device status (as returned by the GET_STATUS
request) and allow it to be manipulated by set_selfpowered() as
well as SET_FEATURE/CLEAR_FEATURE (for remote wakeup)

Implement the wakeup() op, which refuses to do anything if the
DEVICE_REMOTE_WAKEUP feature wasn't set by the host.  Now this
driver passes USBCV (at least, with gadget zero).

Fix one more locking bug; lockdep is every developer's friend.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 2bb28a5..4fb5ff4 100644 (file)
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -989,8 +989,44 @@ static int usba_udc_get_frame(struct usb_gadget *gadget)
        return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 }
 
+static int usba_udc_wakeup(struct usb_gadget *gadget)
+{
+       struct usba_udc *udc = to_usba_udc(gadget);
+       unsigned long flags;
+       u32 ctrl;
+       int ret = -EINVAL;
+
+       spin_lock_irqsave(&udc->lock, flags);
+       if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
+               ctrl = usba_readl(udc, CTRL);
+               usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
+               ret = 0;
+       }
+       spin_unlock_irqrestore(&udc->lock, flags);
+
+       return ret;
+}
+
+static int
+usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
+{
+       struct usba_udc *udc = to_usba_udc(gadget);
+       unsigned long flags;
+
+       spin_lock_irqsave(&udc->lock, flags);
+       if (is_selfpowered)
+               udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
+       else
+               udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+       spin_unlock_irqrestore(&udc->lock, flags);
+
+       return 0;
+}
+
 static const struct usb_gadget_ops usba_udc_ops = {
-       .get_frame      = usba_udc_get_frame,
+       .get_frame              = usba_udc_get_frame,
+       .wakeup                 = usba_udc_wakeup,
+       .set_selfpowered        = usba_udc_set_selfpowered,
 };
 
 #define EP(nam, idx, maxpkt, maxbk, dma, isoc)                 \
@@ -1068,8 +1104,11 @@ static void reset_all_endpoints(struct usba_udc *udc)
        }
 
        list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
-               if (ep->desc)
+               if (ep->desc) {
+                       spin_unlock(&udc->lock);
                        usba_ep_disable(&ep->ep);
+                       spin_lock(&udc->lock);
+               }
        }
 }
 
@@ -1238,8 +1277,7 @@ static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
                u16 status;
 
                if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
-                       /* Self-powered, no remote wakeup */
-                       status = __constant_cpu_to_le16(1 << 0);
+                       status = cpu_to_le16(udc->devstatus);
                } else if (crq->bRequestType
                                == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
                        status = __constant_cpu_to_le16(0);
@@ -1268,12 +1306,12 @@ static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
 
        case USB_REQ_CLEAR_FEATURE: {
                if (crq->bRequestType == USB_RECIP_DEVICE) {
-                       if (feature_is_dev_remote_wakeup(crq)) {
-                               /* TODO: Handle REMOTE_WAKEUP */
-                       } else {
+                       if (feature_is_dev_remote_wakeup(crq))
+                               udc->devstatus
+                                       &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
+                       else
                                /* Can't CLEAR_FEATURE TEST_MODE */
                                goto stall;
-                       }
                } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
                        struct usba_ep *target;
 
@@ -1304,7 +1342,7 @@ static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
                                udc->test_mode = le16_to_cpu(crq->wIndex);
                                return 0;
                        } else if (feature_is_dev_remote_wakeup(crq)) {
-                               /* TODO: Handle REMOTE_WAKEUP */
+                               udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
                        } else {
                                goto stall;
                        }
@@ -1791,6 +1829,7 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
                return -EBUSY;
        }
 
+       udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
        udc->driver = driver;
        udc->gadget.dev.driver = &driver->driver;
        spin_unlock_irqrestore(&udc->lock, flags);

diff --git a/drivers/usb/gadget/atmel_usba_udc.h b/drivers/usb/gadget/atmel_usba_udc.h
index f4f0f8b..a68304e 100644 (file)
--- a/drivers/usb/gadget/atmel_usba_udc.h
+++ b/drivers/usb/gadget/atmel_usba_udc.h
@@ -320,7 +320,9 @@ struct usba_udc {
        struct clk *pclk;
        struct clk *hclk;
 
-       int test_mode;
+       u16 devstatus;
+
+       u16 test_mode;
        int vbus_prev;
 
 #ifdef CONFIG_USB_GADGET_DEBUG_FS