1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/base/power/resume.c b/drivers/base/power/resume.c
new file mode 100644
index 00000000000..f8f5055754d
--- /dev/null
+++ b/drivers/base/power/resume.c
@@ -0,0 +1,112 @@
+/*
+ * resume.c - Functions for waking devices up.
+ *
+ * Copyright (c) 2003 Patrick Mochel
+ * Copyright (c) 2003 Open Source Development Labs
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/device.h>
+#include "power.h"
+
+extern int sysdev_resume(void);
+
+
+/**
+ *	resume_device - Restore state for one device.
+ *	@dev:	Device.
+ *
+ */
+
+int resume_device(struct device * dev)
+{
+	if (dev->bus && dev->bus->resume)
+		return dev->bus->resume(dev);
+	return 0;
+}
+
+
+
+void dpm_resume(void)
+{
+	down(&dpm_list_sem);
+	while(!list_empty(&dpm_off)) {
+		struct list_head * entry = dpm_off.next;
+		struct device * dev = to_device(entry);
+
+		get_device(dev);
+		list_del_init(entry);
+		list_add_tail(entry, &dpm_active);
+
+		up(&dpm_list_sem);
+		if (!dev->power.prev_state)
+			resume_device(dev);
+		down(&dpm_list_sem);
+		put_device(dev);
+	}
+	up(&dpm_list_sem);
+}
+
+
+/**
+ *	device_resume - Restore state of each device in system.
+ *
+ *	Walk the dpm_off list, remove each entry, resume the device,
+ *	then add it to the dpm_active list.
+ */
+
+void device_resume(void)
+{
+	down(&dpm_sem);
+	dpm_resume();
+	up(&dpm_sem);
+}
+
+EXPORT_SYMBOL_GPL(device_resume);
+
+
+/**
+ *	device_power_up_irq - Power on some devices.
+ *
+ *	Walk the dpm_off_irq list and power each device up. This
+ *	is used for devices that required they be powered down with
+ *	interrupts disabled. As devices are powered on, they are moved to
+ *	the dpm_suspended list.
+ *
+ *	Interrupts must be disabled when calling this.
+ */
+
+void dpm_power_up(void)
+{
+	while(!list_empty(&dpm_off_irq)) {
+		struct list_head * entry = dpm_off_irq.next;
+		struct device * dev = to_device(entry);
+
+		get_device(dev);
+		list_del_init(entry);
+		list_add_tail(entry, &dpm_active);
+		resume_device(dev);
+		put_device(dev);
+	}
+}
+
+
+/**
+ *	device_pm_power_up - Turn on all devices that need special attention.
+ *
+ *	Power on system devices then devices that required we shut them down
+ *	with interrupts disabled.
+ *	Called with interrupts disabled.
+ */
+
+void device_power_up(void)
+{
+	sysdev_resume();
+	dpm_power_up();
+}
+
+EXPORT_SYMBOL_GPL(device_power_up);
+
+