LXR linux/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/config.h>
  12#include <linux/device.h>
  13#include <asm/semaphore.h>
  14
  15#include "power.h"
  16
  17#define to_dev(node) container_of(node, struct device, kobj.entry)
  18
  19extern struct subsystem devices_subsys;
  20
  21
  22int device_detach_shutdown(struct device * dev)
  23{
  24        if (!dev->detach_state)
  25                return 0;
  26
  27        if (dev->detach_state == DEVICE_PM_OFF) {
  28                if (dev->driver && dev->driver->shutdown)
  29                        dev->driver->shutdown(dev);
  30                return 0;
  31        }
  32        return dpm_runtime_suspend(dev, dev->detach_state);
  33}
  34
  35
  36/**
  37 * We handle system devices differently - we suspend and shut them
  38 * down last and resume them first. That way, we don't do anything stupid like
  39 * shutting down the interrupt controller before any devices..
  40 *
  41 * Note that there are not different stages for power management calls -
  42 * they only get one called once when interrupts are disabled.
  43 */
  44
  45extern int sysdev_shutdown(void);
  46
  47/**
  48 * device_shutdown - call ->shutdown() on each device to shutdown.
  49 */
  50void device_shutdown(void)
  51{
  52        struct device * dev;
  53
  54        down_write(&devices_subsys.rwsem);
  55        list_for_each_entry_reverse(dev, &devices_subsys.kset.list, kobj.entry) {
  56                pr_debug("shutting down %s: ", dev->bus_id);
  57                if (dev->driver && dev->driver->shutdown) {
  58                        pr_debug("Ok\n");
  59                        dev->driver->shutdown(dev);
  60                } else
  61                        pr_debug("Ignored.\n");
  62        }
  63        up_write(&devices_subsys.rwsem);
  64
  65        sysdev_shutdown();
  66}
  67
  68