tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/config.h>
12#include <linux/device.h>
13#include <asm/semaphore.h>
14
15#include "../base.h"
16#include "power.h"
17
18#define to_dev(node) container_of(node, struct device, kobj.entry)
19
20extern struct subsystem devices_subsys;
21
22
23/**
24 * We handle system devices differently - we suspend and shut them
25 * down last and resume them first. That way, we don't do anything stupid like
26 * shutting down the interrupt controller before any devices..
27 *
28 * Note that there are not different stages for power management calls -
29 * they only get one called once when interrupts are disabled.
30 */
31
32
33/**
34 * device_shutdown - call ->shutdown() on each device to shutdown.
35 */
36void device_shutdown(void)
37{
38 struct device * dev, *devn;
39
40 down_write(&devices_subsys.rwsem);
41 list_for_each_entry_safe_reverse(dev, devn, &devices_subsys.kset.list,
42 kobj.entry) {
43 if (dev->bus && dev->bus->shutdown) {
44 dev_dbg(dev, "shutdown\n");
45 dev->bus->shutdown(dev);
46 } else if (dev->driver && dev->driver->shutdown) {
47 dev_dbg(dev, "shutdown\n");
48 dev->driver->shutdown(dev);
49 }
50 }
51 up_write(&devices_subsys.rwsem);
52
53 sysdev_shutdown();
54}
55