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

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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>
This commit is contained in:
Rafael J. Wysocki 2009-12-03 21:19:18 +01:00
parent 965c4ac061
commit 7a1a8eb58a
3 changed files with 22 additions and 5 deletions
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7
Documentation/power/runtime_pm.txt
View file

@ -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

8
include/linux/pm.h
View file

@ -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;

12
include/linux/pm_runtime.h
View file

@ -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 */