drivers/base/power/main.c

   1 /*
   2  * drivers/base/power/main.c - Where the driver meets power management.
   3  *
   4  * Copyright (c) 2003 Patrick Mochel
   5  * Copyright (c) 2003 Open Source Development Lab
   6  *
   7  * This file is released under the GPLv2
   8  *
   9  *
  10  * The driver model core calls device_pm_add() when a device is registered.
  11  * This will intialize the embedded device_pm_info object in the device
  12  * and add it to the list of power-controlled devices. sysfs entries for
  13  * controlling device power management will also be added.
  14  *
  15  * A different set of lists than the global subsystem list are used to
  16  * keep track of power info because we use different lists to hold
  17  * devices based on what stage of the power management process they
  18  * are in. The power domain dependencies may also differ from the
  19  * ancestral dependencies that the subsystem list maintains.
  20  */
  21
  22 #include <linux/device.h>
  23 #include <linux/mutex.h>
  24
  25 #include "power.h"
  26
  27 LIST_HEAD(dpm_active);
  28 LIST_HEAD(dpm_off);
  29 LIST_HEAD(dpm_off_irq);
  30
  31 DEFINE_MUTEX(dpm_mtx);
  32 DEFINE_MUTEX(dpm_list_mtx);
  33
  34 int (*platform_enable_wakeup)(struct device *dev, int is_on);
  35
  36 int device_pm_add(struct device *dev)
  37 {
  38         int error;
  39
  40         pr_debug("PM: Adding info for %s:%s\n",
  41                  dev->bus ? dev->bus->name : "No Bus",
  42                  kobject_name(&dev->kobj));
  43         mutex_lock(&dpm_list_mtx);
  44         list_add_tail(&dev->power.entry, &dpm_active);
  45         error = dpm_sysfs_add(dev);
  46         if (error)
  47                 list_del(&dev->power.entry);
  48         mutex_unlock(&dpm_list_mtx);
  49         return error;
  50 }
  51
  52 void device_pm_remove(struct device *dev)
  53 {
  54         pr_debug("PM: Removing info for %s:%s\n",
  55                  dev->bus ? dev->bus->name : "No Bus",
  56                  kobject_name(&dev->kobj));
  57         mutex_lock(&dpm_list_mtx);
  58         dpm_sysfs_remove(dev);
  59         list_del_init(&dev->power.entry);
  60         mutex_unlock(&dpm_list_mtx);
  61 }
  62
  63