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[PATCH] driver model wakeup flags

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This is a refresh of an earlier patch to add "wakeup" support to the
PM core model.  This provides per-device bus-neutral control of the
use of wakeup events.

  * "struct device_pm_info" has two bits that are initialized as
    part of setting up the enclosing struct device:
      - "can_wakeup", reflecting hardware capabilities
      - "may_wakeup", the policy setting (when CONFIG_PM)

  * There's a writeable sysfs "wakeup" file, with one of two values:
      - "enabled", when the policy is to allow wakeup
      - "disabled", when the policy is not to allow it
      - "" if the device can't currently issue wakeups

By default, wakeup is enabled on all devices that support it.  If its
driver doesn't support it ... treat it as a bug.  :)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell
2005-09-12 19:39:34 -07:00
committed by Greg Kroah-Hartman
parent 2a7ff1feda
commit 0ac85241eb
3 changed files with 99 additions and 1 deletions
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26
include/linux/pm.h
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@@ -219,7 +219,9 @@ typedef struct pm_message {
struct dev_pm_info {
pm_message_t power_state;
unsigned can_wakeup:1;
#ifdef CONFIG_PM
unsigned should_wakeup:1;
pm_message_t prev_state;
void * saved_state;
atomic_t pm_users;
@@ -236,13 +238,35 @@ extern void device_resume(void);
#ifdef CONFIG_PM
extern int device_suspend(pm_message_t state);
#else
#define device_set_wakeup_enable(dev,val) \
((dev)->power.should_wakeup = !!(val))
#define device_may_wakeup(dev) \
(device_can_wakeup(dev) && (dev)->power.should_wakeup)
#else /* !CONFIG_PM */
static inline int device_suspend(pm_message_t state)
{
return 0;
}
#define device_set_wakeup_enable(dev,val) do{}while(0)
#define device_may_wakeup(dev) (0)
#endif
/* changes to device_may_wakeup take effect on the next pm state change.
* by default, devices should wakeup if they can.
*/
#define device_can_wakeup(dev) \
((dev)->power.can_wakeup)
#define device_init_wakeup(dev,val) \
do { \
device_can_wakeup(dev) = !!(val); \
device_set_wakeup_enable(dev,val); \
} while(0)
#endif /* __KERNEL__ */
#endif /* _LINUX_PM_H */