diff options
| -rw-r--r-- | include/linux/suspend.h | 8 | ||||
| -rw-r--r-- | kernel/power/suspend.c | 18 |
2 files changed, 20 insertions, 6 deletions
diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 083ffea7ba18..e1e3742733be 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -92,6 +92,13 @@ typedef int __bitwise suspend_state_t; * @enter() and @wake(), even if any of them fails. It is executed after * a failing @prepare. * + * @suspend_again: Returns whether the system should suspend again (true) or + * not (false). If the platform wants to poll sensors or execute some + * code during suspended without invoking userspace and most of devices, + * suspend_again callback is the place assuming that periodic-wakeup or + * alarm-wakeup is already setup. This allows to execute some codes while + * being kept suspended in the view of userland and devices. + * * @end: Called by the PM core right after resuming devices, to indicate to * the platform that the system has returned to the working state or * the transition to the sleep state has been aborted. @@ -113,6 +120,7 @@ struct platform_suspend_ops { int (*enter)(suspend_state_t state); void (*wake)(void); void (*finish)(void); + bool (*suspend_again)(void); void (*end)(void); void (*recover)(void); }; diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 1c41ba215419..b6762f43365d 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -126,12 +126,13 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void) } /** - * suspend_enter - enter the desired system sleep state. - * @state: state to enter + * suspend_enter - enter the desired system sleep state. + * @state: State to enter + * @wakeup: Returns information that suspend should not be entered again. * - * This function should be called after devices have been suspended. + * This function should be called after devices have been suspended. */ -static int suspend_enter(suspend_state_t state) +static int suspend_enter(suspend_state_t state, bool *wakeup) { int error; @@ -165,7 +166,8 @@ static int suspend_enter(suspend_state_t state) error = syscore_suspend(); if (!error) { - if (!(suspend_test(TEST_CORE) || pm_wakeup_pending())) { + *wakeup = pm_wakeup_pending(); + if (!(suspend_test(TEST_CORE) || *wakeup)) { error = suspend_ops->enter(state); events_check_enabled = false; } @@ -199,6 +201,7 @@ static int suspend_enter(suspend_state_t state) int suspend_devices_and_enter(suspend_state_t state) { int error; + bool wakeup = false; if (!suspend_ops) return -ENOSYS; @@ -220,7 +223,10 @@ int suspend_devices_and_enter(suspend_state_t state) if (suspend_test(TEST_DEVICES)) goto Recover_platform; - error = suspend_enter(state); + do { + error = suspend_enter(state, &wakeup); + } while (!error && !wakeup + && suspend_ops->suspend_again && suspend_ops->suspend_again()); Resume_devices: suspend_test_start(); |