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cpu_pm: call notifiers during suspend

Implements syscore_ops in cpu_pm to call the cpu and
cpu cluster notifiers during suspend and resume,
allowing drivers receiving the notifications to
avoid implementing syscore_ops.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
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1 parent ab10023 commit 6f3eaec87b6b17bfa49cb3b5b8d07fa84be18512 @colincross colincross committed with SantoshShilimkar Jul 22, 2011
Showing with 33 additions and 0 deletions.
  1. +33 −0 kernel/cpu_pm.c
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33 kernel/cpu_pm.c
@@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/spinlock.h>
+#include <linux/syscore_ops.h>
static DEFINE_RWLOCK(cpu_pm_notifier_lock);
static RAW_NOTIFIER_HEAD(cpu_pm_notifier_chain);
@@ -198,3 +199,35 @@ int cpu_cluster_pm_exit(void)
return ret;
}
EXPORT_SYMBOL_GPL(cpu_cluster_pm_exit);
+
+#ifdef CONFIG_PM
+static int cpu_pm_suspend(void)
+{
+ int ret;
+
+ ret = cpu_pm_enter();
+ if (ret)
+ return ret;
+
+ ret = cpu_cluster_pm_enter();
+ return ret;
+}
+
+static void cpu_pm_resume(void)
+{
+ cpu_cluster_pm_exit();
+ cpu_pm_exit();
+}
+
+static struct syscore_ops cpu_pm_syscore_ops = {
+ .suspend = cpu_pm_suspend,
+ .resume = cpu_pm_resume,
+};
+
+static int cpu_pm_init(void)
+{
+ register_syscore_ops(&cpu_pm_syscore_ops);
+ return 0;
+}
+core_initcall(cpu_pm_init);
+#endif

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