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>

diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
index 6bb25cb..4a3109b 100644 (file)
--- a/Documentation/power/runtime_pm.txt
+++ b/Documentation/power/runtime_pm.txt
@@ -71,9 +71,9 @@ what to do to handle the device).
     purpose).
 
 In particular, if the driver requires remote wakeup capability for proper
-functioning and device_may_wakeup() returns 'false' for the device, then
+functioning and device_run_wake() returns 'false' for the device, then
 ->runtime_suspend() should return -EBUSY.  On the other hand, if
-device_may_wakeup() returns 'true' for the device and the device is put
+device_run_wake() returns 'true' for the device and the device is put
 into a low power state during the execution of its bus type's
 ->runtime_suspend(), it is expected that remote wake-up (i.e. hardware mechanism
 allowing the device to request a change of its power state, such as PCI PME)
@@ -215,6 +215,9 @@ defined in include/linux/pm.h:
       being executed for that device and it is not practical to wait for the
       suspend to complete; means "start a resume as soon as you've suspended"
 
+  unsigned int run_wake;
+    - set if the device is capable of generating run-time wake-up events
+
   enum rpm_status runtime_status;
     - the run-time PM status of the device; this field's initial value is
       RPM_SUSPENDED, which means that each device is initially regarded by the

diff --git a/include/linux/pm.h b/include/linux/pm.h
index 3b7e04b..0d65934 100644 (file)
--- 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 4408704..370ce0a 100644 (file)
--- 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 */