USB: Enhance usage of pm_message_t
This patch (as1177) modifies the USB core suspend and resume
routines. The resume functions now will take a pm_message_t argument,
so they will know what sort of resume is occurring. The new argument
is also passed to the port suspend/resume and bus suspend/resume
routines (although they don't use it for anything but debugging).
In addition, special pm_message_t values are used for user-initiated,
device-initiated (i.e., remote wakeup), and automatic suspend/resume.
By testing these values, drivers can tell whether or not a particular
suspend was an autosuspend. Unfortunately, they can't do the same for
resumes -- not until the pm_message_t argument is also passed to the
drivers' resume methods. That will require a bigger change.
IMO, the whole Power Management framework should have been set up this
way in the first place.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 7403ed8..a007987 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1573,14 +1573,14 @@
#ifdef CONFIG_PM
-int hcd_bus_suspend(struct usb_device *rhdev)
+int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
{
struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
int status;
int old_state = hcd->state;
dev_dbg(&rhdev->dev, "bus %s%s\n",
- rhdev->auto_pm ? "auto-" : "", "suspend");
+ (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "suspend");
if (!hcd->driver->bus_suspend) {
status = -ENOENT;
} else {
@@ -1598,14 +1598,14 @@
return status;
}
-int hcd_bus_resume(struct usb_device *rhdev)
+int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
{
struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
int status;
int old_state = hcd->state;
dev_dbg(&rhdev->dev, "usb %s%s\n",
- rhdev->auto_pm ? "auto-" : "", "resume");
+ (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
if (!hcd->driver->bus_resume)
return -ENOENT;
if (hcd->state == HC_STATE_RUNNING)
@@ -1638,7 +1638,7 @@
usb_lock_device(udev);
usb_mark_last_busy(udev);
- usb_external_resume_device(udev);
+ usb_external_resume_device(udev, PMSG_REMOTE_RESUME);
usb_unlock_device(udev);
}