Spidernet RX Refill
[linux-2.6] / drivers / base / power / shutdown.c
1 /*
2  * shutdown.c - power management functions for the device tree.
3  *
4  * Copyright (c) 2002-3 Patrick Mochel
5  *               2002-3 Open Source Development Lab
6  *
7  * This file is released under the GPLv2
8  *
9  */
10
11 #include <linux/device.h>
12 #include <asm/semaphore.h>
13
14 #include "../base.h"
15 #include "power.h"
16
17 #define to_dev(node) container_of(node, struct device, kobj.entry)
18
19 extern struct subsystem devices_subsys;
20
21
22 /**
23  * We handle system devices differently - we suspend and shut them
24  * down last and resume them first. That way, we don't do anything stupid like
25  * shutting down the interrupt controller before any devices..
26  *
27  * Note that there are not different stages for power management calls -
28  * they only get one called once when interrupts are disabled.
29  */
30
31
32 /**
33  * device_shutdown - call ->shutdown() on each device to shutdown.
34  */
35 void device_shutdown(void)
36 {
37         struct device * dev, *devn;
38
39         down_write(&devices_subsys.rwsem);
40         list_for_each_entry_safe_reverse(dev, devn, &devices_subsys.kset.list,
41                                 kobj.entry) {
42                 if (dev->bus && dev->bus->shutdown) {
43                         dev_dbg(dev, "shutdown\n");
44                         dev->bus->shutdown(dev);
45                 } else if (dev->driver && dev->driver->shutdown) {
46                         dev_dbg(dev, "shutdown\n");
47                         dev->driver->shutdown(dev);
48                 }
49         }
50         up_write(&devices_subsys.rwsem);
51
52         sysdev_shutdown();
53 }
54