[PATCH] USB: remove usbcore-specific wakeup flags

This makes usbcore use the driver model wakeup flags for host controllers
and for their root hubs.  Since previous patches have removed all users of
the HCD flags they replace, this converts the last users of those flags.

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

4 files changed, 48 insertions, 27 deletions

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 29b5b2a6e18..e0afb5ad29e 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -264,14 +264,19 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
 		 */
 		retval = pci_set_power_state (dev, PCI_D3hot);
 		if (retval == 0) {
-			dev_dbg (hcd->self.controller, "--> PCI D3\n");
+			int wake = device_can_wakeup(&hcd->self.root_hub->dev);
+
+			wake = wake && device_may_wakeup(hcd->self.controller);
+
+			dev_dbg (hcd->self.controller, "--> PCI D3%s\n",
+					wake ? "/wakeup" : "");
 
 			/* Ignore these return values.  We rely on pci code to
 			 * reject requests the hardware can't implement, rather
 			 * than coding the same thing.
 			 */
-			(void) pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
-			(void) pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup);
+			(void) pci_enable_wake (dev, PCI_D3hot, wake);
+			(void) pci_enable_wake (dev, PCI_D3cold, wake);
 		} else {
 			dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
 					retval);
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 6368562d73c..a98d978d76e 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -367,21 +367,39 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 
 	/* DEVICE REQUESTS */
 
+	/* The root hub's remote wakeup enable bit is implemented using
+	 * driver model wakeup flags.  If this system supports wakeup
+	 * through USB, userspace may change the default "allow wakeup"
+	 * policy through sysfs or these calls.
+	 *
+	 * Most root hubs support wakeup from downstream devices, for
+	 * runtime power management (disabling USB clocks and reducing
+	 * VBUS power usage).  However, not all of them do so; silicon,
+	 * board, and BIOS bugs here are not uncommon, so these can't
+	 * be treated quite like external hubs.
+	 *
+	 * Likewise, not all root hubs will pass wakeup events upstream,
+	 * to wake up the whole system.  So don't assume root hub and
+	 * controller capabilities are identical.
+	 */
+
 	case DeviceRequest | USB_REQ_GET_STATUS:
-		tbuf [0] = (hcd->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP)
+		tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
+					<< USB_DEVICE_REMOTE_WAKEUP)
 				| (1 << USB_DEVICE_SELF_POWERED);
 		tbuf [1] = 0;
 		len = 2;
 		break;
 	case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
 		if (wValue == USB_DEVICE_REMOTE_WAKEUP)
-			hcd->remote_wakeup = 0;
+			device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
 		else
 			goto error;
 		break;
 	case DeviceOutRequest | USB_REQ_SET_FEATURE:
-		if (hcd->can_wakeup && wValue == USB_DEVICE_REMOTE_WAKEUP)
-			hcd->remote_wakeup = 1;
+		if (device_can_wakeup(&hcd->self.root_hub->dev)
+				&& wValue == USB_DEVICE_REMOTE_WAKEUP)
+			device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
 		else
 			goto error;
 		break;
@@ -410,7 +428,7 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 				bufp = fs_rh_config_descriptor;
 				len = sizeof fs_rh_config_descriptor;
 			}
-			if (hcd->can_wakeup)
+			if (device_can_wakeup(&hcd->self.root_hub->dev))
 				patch_wakeup = 1;
 			break;
 		case USB_DT_STRING << 8:
@@ -1804,16 +1822,10 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	device_init_wakeup(&rhdev->dev,
 			device_can_wakeup(hcd->self.controller));
 
-	// ... all these hcd->*_wakeup flags will vanish
-	hcd->can_wakeup = device_can_wakeup(hcd->self.controller);
-
-	/* hcd->driver->reset() reported can_wakeup, probably with
-	 * assistance from board's boot firmware.
-	 * NOTE:  normal devices won't enable wakeup by default.
-	 */
-	if (hcd->can_wakeup)
+	/* NOTE: root hub and controller capabilities may not be the same */
+	if (device_can_wakeup(hcd->self.controller)
+			&& device_can_wakeup(&hcd->self.root_hub->dev))
 		dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
-	hcd->remote_wakeup = hcd->can_wakeup;
 
 	/* enable irqs just before we start the controller */
 	if (hcd->driver->irq) {
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index f44a2fe62a9..7022aafb2ae 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -78,8 +78,6 @@ struct usb_hcd {	/* usb_bus.hcpriv points to this */
 #define HCD_FLAG_HW_ACCESSIBLE	0x00000001
 #define HCD_FLAG_SAW_IRQ	0x00000002
 
-	unsigned		can_wakeup:1;	/* hw supports wakeup? */
-	unsigned		remote_wakeup:1;/* sw should use wakeup? */
 	unsigned		rh_registered:1;/* is root hub registered? */
 
 	/* The next flag is a stopgap, to be removed when all the HCDs
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 867fa813023..f1d64d4bbf5 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1006,12 +1006,18 @@ void usb_set_device_state(struct usb_device *udev,
 		;	/* do nothing */
 	else if (new_state != USB_STATE_NOTATTACHED) {
 		udev->state = new_state;
-		if (new_state == USB_STATE_CONFIGURED)
-			device_init_wakeup(&udev->dev,
-				(udev->actconfig->desc.bmAttributes
-				 & USB_CONFIG_ATT_WAKEUP));
-		else if (new_state != USB_STATE_SUSPENDED)
-			device_init_wakeup(&udev->dev, 0);
+
+		/* root hub wakeup capabilities are managed out-of-band
+		 * and may involve silicon errata ... ignore them here.
+		 */
+		if (udev->parent) {
+			if (new_state == USB_STATE_CONFIGURED)
+				device_init_wakeup(&udev->dev,
+					(udev->actconfig->desc.bmAttributes
+					 & USB_CONFIG_ATT_WAKEUP));
+			else if (new_state != USB_STATE_SUSPENDED)
+				device_init_wakeup(&udev->dev, 0);
+		}
 	} else
 		recursively_mark_NOTATTACHED(udev);
 	spin_unlock_irqrestore(&device_state_lock, flags);
@@ -1877,9 +1883,9 @@ int usb_resume_device(struct usb_device *udev)
 	if (udev->state == USB_STATE_NOTATTACHED)
 		return -ENODEV;
 
-#ifdef	CONFIG_USB_SUSPEND
 	/* selective resume of one downstream hub-to-device port */
 	if (udev->parent) {
+#ifdef	CONFIG_USB_SUSPEND
 		if (udev->state == USB_STATE_SUSPENDED) {
 			// NOTE swsusp may bork us, device state being wrong...
 			// NOTE this fails if parent is also suspended...
@@ -1887,8 +1893,8 @@ int usb_resume_device(struct usb_device *udev)
 					udev->portnum, udev);
 		} else
 			status = 0;
-	} else
 #endif
+	} else
 		status = finish_device_resume(udev);
 	if (status < 0)
 		dev_dbg(&udev->dev, "can't resume, status %d\n",