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 enum gpd_status {
  15         GPD_STATE_ACTIVE = 0,   /* PM domain is active */
  16         GPD_STATE_WAIT_MASTER,  /* PM domain's master is being waited for */
  17         GPD_STATE_BUSY,         /* Something is happening to the PM domain */
  18         GPD_STATE_REPEAT,       /* Power off in progress, to be repeated */
  19         GPD_STATE_POWER_OFF,    /* PM domain is off */
  20 };
  21
  22 struct dev_power_governor {
  23         bool (*power_down_ok)(struct dev_pm_domain *domain);
  24 };
  25
  26 struct generic_pm_domain {
  27         struct dev_pm_domain domain;    /* PM domain operations */
  28         struct list_head gpd_list_node; /* Node in the global PM domains list */
  29         struct list_head master_links;  /* Links with PM domain as a master */
  30         struct list_head slave_links;   /* Links with PM domain as a slave */
  31         struct list_head dev_list;      /* List of devices */
  32         struct mutex lock;
  33         struct dev_power_governor *gov;
  34         struct work_struct power_off_work;
  35         unsigned int in_progress;       /* Number of devices being suspended now */
  36         atomic_t sd_count;      /* Number of subdomains with power "on" */
  37         enum gpd_status status; /* Current state of the domain */
  38         wait_queue_head_t status_wait_queue;
  39         struct task_struct *poweroff_task;      /* Powering off task */
  40         unsigned int resume_count;      /* Number of devices being resumed */
  41         unsigned int device_count;      /* Number of devices */
  42         unsigned int suspended_count;   /* System suspend device counter */
  43         unsigned int prepared_count;    /* Suspend counter of prepared devices */
  44         bool suspend_power_off; /* Power status before system suspend */
  45         bool dev_irq_safe;      /* Device callbacks are IRQ-safe */
  46         int (*power_off)(struct generic_pm_domain *domain);
  47         int (*power_on)(struct generic_pm_domain *domain);
  48         int (*start_device)(struct device *dev);
  49         int (*stop_device)(struct device *dev);
  50         bool (*active_wakeup)(struct device *dev);
  51 };
  52
  53 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
  54 {
  55         return container_of(pd, struct generic_pm_domain, domain);
  56 }
  57
  58 struct gpd_link {
  59         struct generic_pm_domain *master;
  60         struct list_head master_node;
  61         struct generic_pm_domain *slave;
  62         struct list_head slave_node;
  63 };
  64
  65 #ifdef CONFIG_PM_GENERIC_DOMAINS
  66 extern int pm_genpd_add_device(struct generic_pm_domain *genpd,
  67                                struct device *dev);
  68 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
  69                                   struct device *dev);
  70 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
  71                                   struct generic_pm_domain *new_subdomain);
  72 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
  73                                      struct generic_pm_domain *target);
  74 extern void pm_genpd_init(struct generic_pm_domain *genpd,
  75                           struct dev_power_governor *gov, bool is_off);
  76 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
  77 #else
  78 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
  79                                       struct device *dev)
  80 {
  81         return -ENOSYS;
  82 }
  83 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
  84                                          struct device *dev)
  85 {
  86         return -ENOSYS;
  87 }
  88 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
  89                                          struct generic_pm_domain *new_sd)
  90 {
  91         return -ENOSYS;
  92 }
  93 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
  94                                             struct generic_pm_domain *target)
  95 {
  96         return -ENOSYS;
  97 }
  98 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
  99                                  struct dev_power_governor *gov, bool is_off) {}
 100 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
 101 {
 102         return -ENOSYS;
 103 }
 104 #endif
 105
 106 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
 107 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
 108 extern void pm_genpd_poweroff_unused(void);
 109 #else
 110 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
 111 static inline void pm_genpd_poweroff_unused(void) {}
 112 #endif
 113
 114 #endif /* _LINUX_PM_DOMAIN_H */