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authorMagnus Damm <damm@opensource.se>2010-02-02 14:41:41 -0800
committerThomas Gleixner <tglx@linutronix.de>2010-02-05 14:54:10 +0100
commitc54a42b19fbaae4e9f212322ecca25a6bc95c1ba (patch)
tree2c929d3cde3b4ae864d5f5a50bdda688fd5293eb /include/linux/clocksource.h
parent17622339af2536b32cf29699ddd4ba0fe79a61d5 (diff)
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clocksource: add suspend callback
Add a clocksource suspend callback. This callback can be used by the clocksource driver to shutdown and perform any kind of late suspend activities even though the clocksource driver itself is a non-sysdev driver. One example where this is useful is to fix the sh_cmt.c platform driver that today suspends using the platform bus and shuts down the clocksource too early. With this callback in place the sh_cmt driver will suspend using the clocksource and clockevent hooks and leave the platform device pm callbacks unused. Signed-off-by: Magnus Damm <damm@opensource.se> Cc: Paul Mundt <lethal@linux-sh.org> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/clocksource.h')
-rw-r--r--include/linux/clocksource.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 0de7e72..4bca8b6 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -154,6 +154,7 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
* @max_idle_ns: max idle time permitted by the clocksource (nsecs)
* @flags: flags describing special properties
* @vread: vsyscall based read
+ * @suspend: suspend function for the clocksource, if necessary
* @resume: resume function for the clocksource, if necessary
*/
struct clocksource {
@@ -172,6 +173,7 @@ struct clocksource {
u64 max_idle_ns;
unsigned long flags;
cycle_t (*vread)(void);
+ void (*suspend)(struct clocksource *cs);
void (*resume)(struct clocksource *cs);
#ifdef CONFIG_IA64
void *fsys_mmio; /* used by fsyscall asm code */
@@ -277,6 +279,7 @@ extern void clocksource_unregister(struct clocksource*);
extern void clocksource_touch_watchdog(void);
extern struct clocksource* clocksource_get_next(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
+extern void clocksource_suspend(void);
extern void clocksource_resume(void);
extern struct clocksource * __init __weak clocksource_default_clock(void);
extern void clocksource_mark_unstable(struct clocksource *cs);
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