USB: move PCI host controllers to new PM framework

This patch (as1236) converts the USB PCI power management routines
over to the new PM framework.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 123 insertions, 119 deletions

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index a4301dc02d27..5db4d40db832 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -185,194 +185,198 @@ void usb_hcd_pci_remove(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
 
-
-#ifdef	CONFIG_PM
-
 /**
- * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
- * @dev: USB Host Controller being suspended
- * @message: Power Management message describing this state transition
- *
- * Store this function in the HCD's struct pci_driver as .suspend.
+ * usb_hcd_pci_shutdown - shutdown host controller
+ * @dev: USB Host Controller being shutdown
  */
-int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
+void usb_hcd_pci_shutdown(struct pci_dev *dev)
+{
+	struct usb_hcd		*hcd;
+
+	hcd = pci_get_drvdata(dev);
+	if (!hcd)
+		return;
+
+	if (hcd->driver->shutdown)
+		hcd->driver->shutdown(hcd);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
+
+#ifdef	CONFIG_PM_SLEEP
+
+static int check_root_hub_suspended(struct device *dev)
+{
+	struct pci_dev		*pci_dev = to_pci_dev(dev);
+	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
+
+	if (!(hcd->state == HC_STATE_SUSPENDED ||
+			hcd->state == HC_STATE_HALT)) {
+		dev_warn(dev, "Root hub is not suspended\n");
+		return -EBUSY;
+	}
+	return 0;
+}
+
+static int hcd_pci_suspend(struct device *dev)
 {
-	struct usb_hcd		*hcd = pci_get_drvdata(dev);
-	int			retval = 0;
-	int			wake, w;
-	int			has_pci_pm;
+	struct pci_dev		*pci_dev = to_pci_dev(dev);
+	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
+	int			retval;
 
 	/* Root hub suspend should have stopped all downstream traffic,
 	 * and all bus master traffic.  And done so for both the interface
 	 * and the stub usb_device (which we check here).  But maybe it
 	 * didn't; writing sysfs power/state files ignores such rules...
-	 *
-	 * We must ignore the FREEZE vs SUSPEND distinction here, because
-	 * otherwise the swsusp will save (and restore) garbage state.
 	 */
-	if (!(hcd->state == HC_STATE_SUSPENDED ||
-			hcd->state == HC_STATE_HALT)) {
-		dev_warn(&dev->dev, "Root hub is not suspended\n");
-		retval = -EBUSY;
-		goto done;
-	}
+	retval = check_root_hub_suspended(dev);
+	if (retval)
+		return retval;
 
 	/* We might already be suspended (runtime PM -- not yet written) */
-	if (dev->current_state != PCI_D0)
-		goto done;
+	if (pci_dev->current_state != PCI_D0)
+		return retval;
 
 	if (hcd->driver->pci_suspend) {
-		retval = hcd->driver->pci_suspend(hcd, message);
+		retval = hcd->driver->pci_suspend(hcd, PMSG_SUSPEND);
 		suspend_report_result(hcd->driver->pci_suspend, retval);
 		if (retval)
-			goto done;
+			return retval;
 	}
 
-	synchronize_irq(dev->irq);
+	synchronize_irq(pci_dev->irq);
 
 	/* Downstream ports from this root hub should already be quiesced, so
 	 * there will be no DMA activity.  Now we can shut down the upstream
-	 * link (except maybe for PME# resume signaling) and enter some PCI
-	 * low power state, if the hardware allows.
+	 * link (except maybe for PME# resume signaling).  We'll enter a
+	 * low power state during suspend_noirq, if the hardware allows.
 	 */
-	pci_disable_device(dev);
+	pci_disable_device(pci_dev);
+	return retval;
+}
+
+static int hcd_pci_suspend_noirq(struct device *dev)
+{
+	struct pci_dev		*pci_dev = to_pci_dev(dev);
+	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
+	int			retval;
+
+	retval = check_root_hub_suspended(dev);
+	if (retval)
+		return retval;
 
-	pci_save_state(dev);
+	pci_save_state(pci_dev);
 
-	/* Don't fail on error to enable wakeup.  We rely on pci code
-	 * to reject requests the hardware can't implement, rather
-	 * than coding the same thing.
+	/* If the root hub is HALTed rather than SUSPENDed,
+	 * disallow remote wakeup.
 	 */
-	wake = (hcd->state == HC_STATE_SUSPENDED &&
-			device_may_wakeup(&dev->dev));
-	w = pci_wake_from_d3(dev, wake);
-	if (w < 0)
-		wake = w;
-	dev_dbg(&dev->dev, "wakeup: %d\n", wake);
-
-	/* Don't change state if we don't need to */
-	if (message.event == PM_EVENT_FREEZE ||
-			message.event == PM_EVENT_PRETHAW) {
-		dev_dbg(&dev->dev, "--> no state change\n");
-		goto done;
-	}
+	if (hcd->state == HC_STATE_HALT)
+		device_set_wakeup_enable(dev, 0);
+	dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
 
-	has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
-	if (!has_pci_pm) {
-		dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
+	/* Possibly enable remote wakeup,
+	 * choose the appropriate low-power state, and go to that state.
+	 */
+	retval = pci_prepare_to_sleep(pci_dev);
+	if (retval == -EIO) {		/* Low-power not supported */
+		dev_dbg(dev, "--> PCI D0 legacy\n");
+		retval = 0;
+	} else if (retval == 0) {
+		dev_dbg(dev, "--> PCI %s\n",
+				pci_power_name(pci_dev->current_state));
 	} else {
-
-		/* NOTE:  dev->current_state becomes nonzero only here, and
-		 * only for devices that support PCI PM.  Also, exiting
-		 * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
-		 * some device state (e.g. as part of clock reinit).
-		 */
-		retval = pci_set_power_state(dev, PCI_D3hot);
-		suspend_report_result(pci_set_power_state, retval);
-		if (retval == 0) {
-			dev_dbg(&dev->dev, "--> PCI D3\n");
-		} else {
-			dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
-					retval);
-			pci_restore_state(dev);
-		}
+		suspend_report_result(pci_prepare_to_sleep, retval);
+		return retval;
 	}
 
 #ifdef CONFIG_PPC_PMAC
-	if (retval == 0) {
-		/* Disable ASIC clocks for USB */
-		if (machine_is(powermac)) {
-			struct device_node	*of_node;
-
-			of_node = pci_device_to_OF_node(dev);
-			if (of_node)
-				pmac_call_feature(PMAC_FTR_USB_ENABLE,
-							of_node, 0, 0);
-		}
+	/* Disable ASIC clocks for USB */
+	if (machine_is(powermac)) {
+		struct device_node	*of_node;
+
+		of_node = pci_device_to_OF_node(pci_dev);
+		if (of_node)
+			pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
 	}
 #endif
-
- done:
 	return retval;
 }
-EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
 
-/**
- * usb_hcd_pci_resume - power management resume of a PCI-based HCD
- * @dev: USB Host Controller being resumed
- *
- * Store this function in the HCD's struct pci_driver as .resume.
- */
-int usb_hcd_pci_resume(struct pci_dev *dev)
+static int hcd_pci_resume_noirq(struct device *dev)
 {
-	struct usb_hcd		*hcd;
-	int			retval;
+	struct pci_dev		*pci_dev = to_pci_dev(dev);
 
 #ifdef CONFIG_PPC_PMAC
 	/* Reenable ASIC clocks for USB */
 	if (machine_is(powermac)) {
 		struct device_node *of_node;
 
-		of_node = pci_device_to_OF_node(dev);
+		of_node = pci_device_to_OF_node(pci_dev);
 		if (of_node)
 			pmac_call_feature(PMAC_FTR_USB_ENABLE,
 						of_node, 0, 1);
 	}
 #endif
 
-	pci_restore_state(dev);
+	/* Go back to D0 and disable remote wakeup */
+	pci_back_from_sleep(pci_dev);
+	return 0;
+}
+
+static int resume_common(struct device *dev, bool hibernated)
+{
+	struct pci_dev		*pci_dev = to_pci_dev(dev);
+	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
+	int			retval;
 
-	hcd = pci_get_drvdata(dev);
 	if (hcd->state != HC_STATE_SUSPENDED) {
-		dev_dbg(hcd->self.controller,
-				"can't resume, not suspended!\n");
+		dev_dbg(dev, "can't resume, not suspended!\n");
 		return 0;
 	}
 
-	pci_enable_wake(dev, PCI_D0, false);
-
-	retval = pci_enable_device(dev);
+	retval = pci_enable_device(pci_dev);
 	if (retval < 0) {
-		dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
-				retval);
+		dev_err(dev, "can't re-enable after resume, %d!\n", retval);
 		return retval;
 	}
 
-	pci_set_master(dev);
-
-	/* yes, ignore this result too... */
-	(void) pci_wake_from_d3(dev, 0);
+	pci_set_master(pci_dev);
 
 	clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
 
 	if (hcd->driver->pci_resume) {
 		retval = hcd->driver->pci_resume(hcd);
 		if (retval) {
-			dev_err(hcd->self.controller,
-				"PCI post-resume error %d!\n", retval);
+			dev_err(dev, "PCI post-resume error %d!\n", retval);
 			usb_hc_died(hcd);
 		}
 	}
 	return retval;
 }
-EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
 
-#endif	/* CONFIG_PM */
-
-/**
- * usb_hcd_pci_shutdown - shutdown host controller
- * @dev: USB Host Controller being shutdown
- */
-void usb_hcd_pci_shutdown(struct pci_dev *dev)
+static int hcd_pci_resume(struct device *dev)
 {
-	struct usb_hcd		*hcd;
-
-	hcd = pci_get_drvdata(dev);
-	if (!hcd)
-		return;
+	return resume_common(dev, false);
+}
 
-	if (hcd->driver->shutdown)
-		hcd->driver->shutdown(hcd);
+static int hcd_pci_restore(struct device *dev)
+{
+	return resume_common(dev, true);
 }
-EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
 
+struct dev_pm_ops usb_hcd_pci_pm_ops = {
+	.suspend	= hcd_pci_suspend,
+	.suspend_noirq	= hcd_pci_suspend_noirq,
+	.resume_noirq	= hcd_pci_resume_noirq,
+	.resume		= hcd_pci_resume,
+	.freeze		= check_root_hub_suspended,
+	.freeze_noirq	= check_root_hub_suspended,
+	.thaw_noirq	= NULL,
+	.thaw		= NULL,
+	.poweroff	= hcd_pci_suspend,
+	.poweroff_noirq	= hcd_pci_suspend_noirq,
+	.restore_noirq	= hcd_pci_resume_noirq,
+	.restore	= hcd_pci_restore,
+};
+EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
+
+#endif	/* CONFIG_PM_SLEEP */