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 000000000000..f8f5055754d6
--- /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);
+
+