include/linux/pm_domain.h

   1 /*
   2  * pm_domain.h - Definitions and headers related to device power domains.
   3  *
   4  * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
   5  *
   6  * This file is released under the GPLv2.
   7  */
   8
   9 #ifndef _LINUX_PM_DOMAIN_H
  10 #define _LINUX_PM_DOMAIN_H
  11
  12 #include <linux/device.h>
  13
  14 #define GPD_IN_SUSPEND  1
  15 #define GPD_POWER_OFF   2
  16
  17 struct dev_power_governor {
  18         bool (*power_down_ok)(struct dev_pm_domain *domain);
  19 };
  20
  21 struct generic_pm_domain {
  22         struct dev_pm_domain domain;    /* PM domain operations */
  23         struct list_head sd_node;       /* Node in the parent's subdomain list */
  24         struct generic_pm_domain *parent;       /* Parent PM domain */
  25         struct list_head sd_list;       /* List of dubdomains */
  26         struct list_head dev_list;      /* List of devices */
  27         struct mutex lock;
  28         struct dev_power_governor *gov;
  29         struct work_struct power_off_work;
  30         unsigned int in_progress;       /* Number of devices being suspended now */
  31         unsigned int sd_count;  /* Number of subdomains with power "on" */
  32         bool power_is_off;      /* Whether or not power has been removed */
  33         unsigned int device_count;      /* Number of devices */
  34         unsigned int suspended_count;   /* System suspend device counter */
  35         unsigned int prepared_count;    /* Suspend counter of prepared devices */
  36         bool suspend_power_off; /* Power status before system suspend */
  37         int (*power_off)(struct generic_pm_domain *domain);
  38         int (*power_on)(struct generic_pm_domain *domain);
  39         int (*start_device)(struct device *dev);
  40         int (*stop_device)(struct device *dev);
  41 };
  42
  43 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
  44 {
  45         return container_of(pd, struct generic_pm_domain, domain);
  46 }
  47
  48 struct dev_list_entry {
  49         struct list_head node;
  50         struct device *dev;
  51         bool need_restore;
  52 };
  53
  54 #ifdef CONFIG_PM_GENERIC_DOMAINS
  55 extern int pm_genpd_add_device(struct generic_pm_domain *genpd,
  56                                struct device *dev);
  57 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
  58                                   struct device *dev);
  59 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
  60                                   struct generic_pm_domain *new_subdomain);
  61 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
  62                                      struct generic_pm_domain *target);
  63 extern void pm_genpd_init(struct generic_pm_domain *genpd,
  64                           struct dev_power_governor *gov, bool is_off);
  65 #else
  66 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
  67                                       struct device *dev)
  68 {
  69         return -ENOSYS;
  70 }
  71 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
  72                                          struct device *dev)
  73 {
  74         return -ENOSYS;
  75 }
  76 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
  77                                          struct generic_pm_domain *new_sd)
  78 {
  79         return -ENOSYS;
  80 }
  81 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
  82                                             struct generic_pm_domain *target)
  83 {
  84         return -ENOSYS;
  85 }
  86 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
  87                                  struct dev_power_governor *gov, bool is_off) {}
  88 #endif
  89
  90 #endif /* _LINUX_PM_DOMAIN_H */