Some clockevent drivers need to verify state of the clockevent device in their callbacks or interrupt handler.
Because the symbols representing these states (defined by 'enum clock_event_state') are internal to the core, they aren't accessible to these driver.
Introduce helper routines that can verify state of clockevent device.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- include/linux/clockchips.h | 11 +++++++++++ kernel/time/clockevents.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+)
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index 62d3007f8a8c..b0aa9c7b96c4 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -189,6 +189,12 @@ static inline void tick_setup_hrtimer_broadcast(void) { }
extern int clockevents_notify(unsigned long reason, void *arg);
+extern bool clockevent_state_detached(struct clock_event_device *evt); +extern bool clockevent_state_shutdown(struct clock_event_device *evt); +extern bool clockevent_state_periodic(struct clock_event_device *evt); +extern bool clockevent_state_oneshot(struct clock_event_device *evt); +extern bool clockevent_state_oneshot_stopped(struct clock_event_device *evt); + #else /* !CONFIG_GENERIC_CLOCKEVENTS: */
static inline void clockevents_suspend(void) { } @@ -197,6 +203,11 @@ static inline int clockevents_notify(unsigned long reason, void *arg) { return 0 static inline int tick_check_broadcast_expired(void) { return 0; } static inline void tick_setup_hrtimer_broadcast(void) { }
+static inline bool clockevent_state_detached(struct clock_event_device *evt) { return false; }; +static inline bool clockevent_state_shutdown(struct clock_event_device *evt) { return false; }; +static inline bool clockevent_state_periodic(struct clock_event_device *evt) { return false; }; +static inline bool clockevent_state_oneshot(struct clock_event_device *evt) { return false; }; +static inline bool clockevent_state_oneshot_stopped(struct clock_event_device *evt) { return false; }; #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
#endif /* _LINUX_CLOCKCHIPS_H */ diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 4922f1b805ea..ce9bb174d9bb 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -33,6 +33,37 @@ struct ce_unbind { int res; };
+/* Helpers to verify state of a clockevent device */ +bool clockevent_state_detached(struct clock_event_device *evt) +{ + return evt->state == CLOCK_EVT_STATE_DETACHED; +} +EXPORT_SYMBOL_GPL(clockevent_state_detached); + +bool clockevent_state_shutdown(struct clock_event_device *evt) +{ + return evt->state == CLOCK_EVT_STATE_SHUTDOWN; +} +EXPORT_SYMBOL_GPL(clockevent_state_shutdown); + +bool clockevent_state_periodic(struct clock_event_device *evt) +{ + return evt->state == CLOCK_EVT_STATE_PERIODIC; +} +EXPORT_SYMBOL_GPL(clockevent_state_periodic); + +bool clockevent_state_oneshot(struct clock_event_device *evt) +{ + return evt->state == CLOCK_EVT_STATE_ONESHOT; +} +EXPORT_SYMBOL_GPL(clockevent_state_oneshot); + +bool clockevent_state_oneshot_stopped(struct clock_event_device *evt) +{ + return evt->state == CLOCK_EVT_STATE_ONESHOT_STOPPED; +} +EXPORT_SYMBOL_GPL(clockevent_state_oneshot_stopped); + static u64 cev_delta2ns(unsigned long latch, struct clock_event_device *evt, bool ismax) {