+/* Carry out polling-, autostop-, and autoresume-related state changes */
+static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
+ int any_connected)
+{
+ int poll_rh = 1;
+
+ switch (ohci->hc_control & OHCI_CTRL_HCFS) {
+
+ case OHCI_USB_OPER:
+ /* keep on polling until we know a device is connected
+ * and RHSC is enabled */
+ if (!ohci->autostop) {
+ if (any_connected ||
+ !device_may_wakeup(&ohci_to_hcd(ohci)
+ ->self.root_hub->dev)) {
+ if (ohci_readl(ohci, &ohci->regs->intrenable) &
+ OHCI_INTR_RHSC)
+ poll_rh = 0;
+ } else {
+ ohci->autostop = 1;
+ ohci->next_statechange = jiffies + HZ;
+ }
+
+ /* if no devices have been attached for one second, autostop */
+ } else {
+ if (changed || any_connected) {
+ ohci->autostop = 0;
+ ohci->next_statechange = jiffies +
+ STATECHANGE_DELAY;
+ } else if (time_after_eq(jiffies,
+ ohci->next_statechange)
+ && !ohci->ed_rm_list
+ && !(ohci->hc_control &
+ OHCI_SCHED_ENABLES)) {
+ ohci_rh_suspend(ohci, 1);
+ }
+ }
+ break;
+
+ /* if there is a port change, autostart or ask to be resumed */
+ case OHCI_USB_SUSPEND:
+ case OHCI_USB_RESUME:
+ if (changed) {
+ if (ohci->autostop)
+ ohci_rh_resume(ohci);
+ else
+ usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
+ } else {
+ /* everything is idle, no need for polling */
+ poll_rh = 0;
+ }
+ break;
+ }
+ return poll_rh;
+}
+
+#else /* CONFIG_PM */
+
+static inline int ohci_rh_resume(struct ohci_hcd *ohci)
+{
+ return 0;
+}
+
+/* Carry out polling-related state changes.
+ * autostop isn't used when CONFIG_PM is turned off.
+ */
+static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
+ int any_connected)
+{
+ int poll_rh = 1;
+
+ /* keep on polling until RHSC is enabled */
+ if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
+ poll_rh = 0;
+ return poll_rh;
+}
+