[PATCH v2] PM / suspend: Add suspend_target_state()
From: Florian Fainelli
Date: Mon Jul 17 2017 - 16:06:39 EST
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 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@xxxxxxxxx>
---
Changes in v2:
- rename platform_suspend_target_state() -> suspend_target_state()
- directly export the suspend_state_t value and assign it in
suspend_devices_and_enter()
include/linux/suspend.h | 2 ++
kernel/power/suspend.c | 15 +++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 0b1cf32edfd7..7b70e7d6a006 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -202,6 +202,7 @@ struct platform_freeze_ops {
*/
extern void suspend_set_ops(const struct platform_suspend_ops *ops);
extern int suspend_valid_only_mem(suspend_state_t state);
+extern suspend_state_t suspend_target_state(void);
extern unsigned int pm_suspend_global_flags;
@@ -281,6 +282,7 @@ static inline bool pm_resume_via_firmware(void) { return false; }
static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
+static inline suspend_state_t suspend_target_state(void) { return -ENOSYS; }
static inline bool idle_should_freeze(void) { return false; }
static inline void __init pm_states_init(void) {}
static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 3ecf275d7e44..a296d6e25d52 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -47,6 +47,7 @@ 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;
+static suspend_state_t pm_suspend_target_state;
unsigned int pm_suspend_global_flags;
EXPORT_SYMBOL_GPL(pm_suspend_global_flags);
@@ -202,6 +203,18 @@ void suspend_set_ops(const struct platform_suspend_ops *ops)
EXPORT_SYMBOL_GPL(suspend_set_ops);
/**
+ * suspend_target_state - Return the system wide suspend state.
+ *
+ * The pm_suspend_target_state becomes valid during
+ * suspend_devices_and_enter().
+ */
+suspend_state_t suspend_target_state(void)
+{
+ return pm_suspend_target_state;
+}
+EXPORT_SYMBOL_GPL(suspend_target_state);
+
+/**
* suspend_valid_only_mem - Generic memory-only valid callback.
*
* Platform drivers that implement mem suspend only and only need to check for
@@ -456,6 +469,8 @@ 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;
--
2.9.3