[PATCH] USB UHCI: Add root hub states

This patch starts making some serious changes to the UHCI driver.
There's a set of private states for the root hub, and the internal
routines for suspending and resuming work completely differently, with
transitions based on the new states.  Now the driver distinguishes
between a privately auto-stopped state and a publicly suspended state,
and it will properly suspend controllers with broken resume-detect
interrupts instead of resetting them.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/uhci-debug.c

@@ -237,6 +237,37 @@ static int uhci_show_sc(int port, unsigned short status, char *buf, int len)
 	return out - buf;
 }
 
+static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf, int len)
+{
+	char *out = buf;
+	char *rh_state;
+
+	/* Try to make sure there's enough memory */
+	if (len < 60)
+		return 0;
+
+	switch (uhci->rh_state) {
+	    case UHCI_RH_RESET:
+		rh_state = "reset";		break;
+	    case UHCI_RH_SUSPENDED:
+		rh_state = "suspended";		break;
+	    case UHCI_RH_AUTO_STOPPED:
+		rh_state = "auto-stopped";	break;
+	    case UHCI_RH_RESUMING:
+		rh_state = "resuming";		break;
+	    case UHCI_RH_SUSPENDING:
+		rh_state = "suspending";	break;
+	    case UHCI_RH_RUNNING:
+		rh_state = "running";		break;
+	    case UHCI_RH_RUNNING_NODEVS:
+		rh_state = "running, no devs";	break;
+	    default:
+		rh_state = "?";			break;
+	}
+	out += sprintf(out, "Root-hub state: %s\n", rh_state);
+	return out - buf;
+}
+
 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
 {
 	char *out = buf;
@@ -408,6 +439,7 @@ static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
 
 	spin_lock_irqsave(&uhci->lock, flags);
 
+	out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
 	out += sprintf(out, "HC status\n");
 	out += uhci_show_status(uhci, out, len - (out - buf));