1 files changed, 67 insertions, 0 deletions
diff --git a/drivers/base/power/shutdown.c b/drivers/base/power/shutdown.c
new file mode 100644
index 00000000000..d1e023fbe16
--- /dev/null
+++ b/drivers/base/power/shutdown.c
@@ -0,0 +1,67 @@
+/*
+ * shutdown.c - power management functions for the device tree.
+ *
+ * Copyright (c) 2002-3 Patrick Mochel
+ *		 2002-3 Open Source Development Lab
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/device.h>
+#include <asm/semaphore.h>
+
+#include "power.h"
+
+#define to_dev(node) container_of(node, struct device, kobj.entry)
+
+extern struct subsystem devices_subsys;
+
+
+int device_detach_shutdown(struct device * dev)
+{
+	if (!dev->detach_state)
+		return 0;
+
+	if (dev->detach_state == DEVICE_PM_OFF) {
+		if (dev->driver && dev->driver->shutdown)
+			dev->driver->shutdown(dev);
+		return 0;
+	}
+	return dpm_runtime_suspend(dev, dev->detach_state);
+}
+
+
+/**
+ * We handle system devices differently - we suspend and shut them
+ * down last and resume them first. That way, we don't do anything stupid like
+ * shutting down the interrupt controller before any devices..
+ *
+ * Note that there are not different stages for power management calls -
+ * they only get one called once when interrupts are disabled.
+ */
+
+extern int sysdev_shutdown(void);
+
+/**
+ * device_shutdown - call ->shutdown() on each device to shutdown.
+ */
+void device_shutdown(void)
+{
+	struct device * dev;
+
+	down_write(&devices_subsys.rwsem);
+	list_for_each_entry_reverse(dev, &devices_subsys.kset.list, kobj.entry) {
+		pr_debug("shutting down %s: ", dev->bus_id);
+		if (dev->driver && dev->driver->shutdown) {
+			pr_debug("Ok\n");
+			dev->driver->shutdown(dev);
+		} else
+			pr_debug("Ignored.\n");
+	}
+	up_write(&devices_subsys.rwsem);
+
+	sysdev_shutdown();
+}
+