PM: Add facility for advanced testing of async suspend/resume

Add configuration switch CONFIG_PM_ADVANCED_DEBUG for compiling in
extra PM debugging/testing code allowing one to access some
PM-related attributes of devices from the user space via sysfs.

If CONFIG_PM_ADVANCED_DEBUG is set, add sysfs attribute power/async
for every device allowing the user space to access the device's
power.async_suspend flag and modify it, if desired.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 70adc5f3f50a..b30527db3ac0 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -478,6 +478,17 @@ static inline void device_enable_async_suspend(struct device *dev)
                 dev->power.async_suspend = true;
 }
 
+static inline void device_disable_async_suspend(struct device *dev)
+{
+        if (dev->power.status == DPM_ON)
+                dev->power.async_suspend = false;
+}
+
+static inline bool device_async_suspend_enabled(struct device *dev)
+{
+        return !!dev->power.async_suspend;
+}
+
 void driver_init(void);
 
 /*