linux-kernel - [PATCH v2 2/5] cpu_pm: call notifiers during suspend

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Date:	Sat, 3 Sep 2011 20:09:12 +0530
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	<linux-arm-kernel@...ts.infradead.org>
CC:	<linux-kernel@...r.kernel.org>, <linux@....linux.org.uk>,
	<ccross@...roid.com>, <rjw@...k.pl>, <khilman@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>
Subject: [PATCH v2 2/5] cpu_pm: call notifiers during suspend

From: Colin Cross <ccross@...roid.com>

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@...roid.com>
[santosh.shilimkar@...com: Rebased against 3.1-rc4]
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...com>
---
 kernel/cpu_pm.c |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
index 54aa892..3d115d0 100644
--- a/kernel/cpu_pm.c
+++ b/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);
@@ -113,3 +114,35 @@ 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
-- 
1.7.4.1

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