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PM / suspend: Export pm_suspend_target_state

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Have the core suspend/resume framework store the system-wide suspend
state (suspend_state_t) we are about to enter, and expose it to drivers
via pm_suspend_target_state in order to retrieve that. The state is
assigned in suspend_devices_and_enter().

This is useful for platform specific drivers that may need to take a
slightly different suspend/resume path based on the system's
suspend/resume state being entered.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Florian Fainelli 2017-07-17 17:19:25 -07:00 committed by Rafael J. Wysocki
parent 5771a8c088
commit bd8c9ba3b1
2 changed files with 6 additions and 0 deletions
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1
include/linux/suspend.h
View File

@ -427,6 +427,7 @@ extern int unregister_pm_notifier(struct notifier_block *nb);
/* drivers/base/power/wakeup.c */
extern bool events_check_enabled;
extern unsigned int pm_wakeup_irq;
extern suspend_state_t pm_suspend_target_state;
extern bool pm_wakeup_pending(void);
extern void pm_system_wakeup(void);

5
kernel/power/suspend.c
View File

@ -47,6 +47,8 @@ const char *mem_sleep_states[PM_SUSPEND_MAX];
suspend_state_t mem_sleep_current = PM_SUSPEND_FREEZE;
static suspend_state_t mem_sleep_default = PM_SUSPEND_MEM;
suspend_state_t pm_suspend_target_state;
EXPORT_SYMBOL_GPL(pm_suspend_target_state);
unsigned int pm_suspend_global_flags;
EXPORT_SYMBOL_GPL(pm_suspend_global_flags);
@ -456,6 +458,8 @@ int suspend_devices_and_enter(suspend_state_t state)
if (!sleep_state_supported(state))
return -ENOSYS;
pm_suspend_target_state = state;
error = platform_suspend_begin(state);
if (error)
goto Close;
@ -485,6 +489,7 @@ int suspend_devices_and_enter(suspend_state_t state)
Close:
platform_resume_end(state);
pm_suspend_target_state = PM_SUSPEND_ON;
return error;
Recover_platform: