USB: prepare for changover to Runtime PM framework

This patch (as1303) revises the USB Power Management infrastructure to
make it compatible with the new driver-model Runtime PM framework:

	Drivers are no longer allowed to access intf->pm_usage_cnt
	directly; the PM framework manages its own usage counters.

	usb_autopm_set_interface() is eliminated, because it directly
	sets intf->pm_usage_cnt.

	usb_autopm_enable() and usb_autopm_disable() are eliminated,
	because they call usb_autopm_set_interface().

	usb_autopm_get_interface_no_resume() and
	usb_autopm_put_interface_no_suspend() are added.  They
	correspond to pm_runtime_get_noresume() and
	pm_runtime_put_noidle() in the PM framework.

	The power/level attribute no longer accepts "suspend", only
	"on" and "auto".  The PM framework doesn't allow devices to be
	forced into a suspended mode.

The hub driver contains the only code that violates the new
guidelines.  It is updated to use the new interface routines instead.

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

1 files changed, 10 insertions, 16 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 4b6f6db544e..6af3581e111 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -432,7 +432,6 @@ struct usb_tt;
  * @do_remote_wakeup:  remote wakeup should be enabled
  * @reset_resume: needs reset instead of resume
  * @autosuspend_disabled: autosuspend disabled by the user
- * @autoresume_disabled: autoresume disabled by the user
  * @skip_sys_resume: skip the next system resume
  * @wusb_dev: if this is a Wireless USB device, link to the WUSB
  *      specific data for the device.
@@ -516,7 +515,6 @@ struct usb_device {
         unsigned do_remote_wakeup:1;
         unsigned reset_resume:1;
         unsigned autosuspend_disabled:1;
-        unsigned autoresume_disabled:1;
         unsigned skip_sys_resume:1;
 #endif
         struct wusb_dev *wusb_dev;
@@ -542,22 +540,20 @@ extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
 
 /* USB autosuspend and autoresume */
 #ifdef CONFIG_USB_SUSPEND
-extern int usb_autopm_set_interface(struct usb_interface *intf);
 extern int usb_autopm_get_interface(struct usb_interface *intf);
 extern void usb_autopm_put_interface(struct usb_interface *intf);
 extern int usb_autopm_get_interface_async(struct usb_interface *intf);
 extern void usb_autopm_put_interface_async(struct usb_interface *intf);
 
-static inline void usb_autopm_enable(struct usb_interface *intf)
+static inline void usb_autopm_get_interface_no_resume(
+                struct usb_interface *intf)
 {
-        atomic_set(&intf->pm_usage_cnt, 0);
-        usb_autopm_set_interface(intf);
+        atomic_inc(&intf->pm_usage_cnt);
 }
-
-static inline void usb_autopm_disable(struct usb_interface *intf)
+static inline void usb_autopm_put_interface_no_suspend(
+                struct usb_interface *intf)
 {
-        atomic_set(&intf->pm_usage_cnt, 1);
-        usb_autopm_set_interface(intf);
+        atomic_dec(&intf->pm_usage_cnt);
 }
 
 static inline void usb_mark_last_busy(struct usb_device *udev)
@@ -567,12 +563,8 @@ static inline void usb_mark_last_busy(struct usb_device *udev)
 
 #else
 
-static inline int usb_autopm_set_interface(struct usb_interface *intf)
-{ return 0; }
-
 static inline int usb_autopm_get_interface(struct usb_interface *intf)
 { return 0; }
-
 static inline int usb_autopm_get_interface_async(struct usb_interface *intf)
 { return 0; }
 
@@ -580,9 +572,11 @@ static inline void usb_autopm_put_interface(struct usb_interface *intf)
 { }
 static inline void usb_autopm_put_interface_async(struct usb_interface *intf)
 { }
-static inline void usb_autopm_enable(struct usb_interface *intf)
+static inline void usb_autopm_get_interface_no_resume(
+                struct usb_interface *intf)
 { }
-static inline void usb_autopm_disable(struct usb_interface *intf)
+static inline void usb_autopm_put_interface_no_suspend(
+                struct usb_interface *intf)
 { }
 static inline void usb_mark_last_busy(struct usb_device *udev)
 { }