PM: Add flag for devices capable of generating run-time wake-up events

Apparently, there are devices that can wake up the system from sleep
states and yet are incapable of generating wake-up events at run
time.  Thus, introduce a flag indicating if given device is capable
of generating run-time wake-up events.

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

2 files changed, 17 insertions, 3 deletions

diff --git a/include/linux/pm.h b/include/linux/pm.h
index 3b7e04b95bd2..0d65934246af 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -178,9 +178,10 @@ typedef struct pm_message {
  *      This need not mean that the device should be put into a low power state.
  *      For example, if the device is behind a link which is about to be turned
  *      off, the device may remain at full power.  If the device does go to low
- *      power and if device_may_wakeup(dev) is true, remote wake-up (i.e., a
- *      hardware mechanism allowing the device to request a change of its power
- *      state, such as PCI PME) should be enabled for it.
+ *      power and is capable of generating run-time wake-up events, remote
+ *      wake-up (i.e., a hardware mechanism allowing the device to request a
+ *      change of its power state via a wake-up event, such as PCI PME) should
+ *      be enabled for it.
  *
  * @runtime_resume: Put the device into the fully active state in response to a
  *      wake-up event generated by hardware or at the request of software.  If
@@ -428,6 +429,7 @@ struct dev_pm_info {
         unsigned int            idle_notification:1;
         unsigned int            request_pending:1;
         unsigned int            deferred_resume:1;
+        unsigned int            run_wake:1;
         enum rpm_request        request;
         enum rpm_status         runtime_status;
         int                     runtime_error;
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 44087044910f..370ce0a6fe4a 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -50,6 +50,16 @@ static inline void pm_runtime_put_noidle(struct device *dev)
         atomic_add_unless(&dev->power.usage_count, -1, 0);
 }
 
+static inline bool device_run_wake(struct device *dev)
+{
+        return dev->power.run_wake;
+}
+
+static inline void device_set_run_wake(struct device *dev, bool enable)
+{
+        dev->power.run_wake = enable;
+}
+
 #else /* !CONFIG_PM_RUNTIME */
 
 static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
@@ -73,6 +83,8 @@ static inline bool pm_children_suspended(struct device *dev) { return false; }
 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
 static inline void pm_runtime_get_noresume(struct device *dev) {}
 static inline void pm_runtime_put_noidle(struct device *dev) {}
+static inline bool device_run_wake(struct device *dev) { return false; }
+static inline void device_set_run_wake(struct device *dev, bool enable) {}
 
 #endif /* !CONFIG_PM_RUNTIME */