1 /* 2 * pm_domain.h - Definitions and headers related to device power domains. 3 * 4 * Copyright (C) 2011 Rafael J. Wysocki <[email protected]>, 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_BUSY, /* Something is happening to the PM domain */ 17 GPD_STATE_REPEAT, /* Power off in progress, to be repeated */ 18 GPD_STATE_POWER_OFF, /* PM domain is off */ 19 }; 20 21 struct dev_power_governor { 22 bool (*power_down_ok)(struct dev_pm_domain *domain); 23 }; 24 25 struct generic_pm_domain { 26 struct dev_pm_domain domain; /* PM domain operations */ 27 struct list_head gpd_list_node; /* Node in the global PM domains list */ 28 struct list_head sd_node; /* Node in the parent's subdomain list */ 29 struct generic_pm_domain *parent; /* Parent PM domain */ 30 struct list_head sd_list; /* List of dubdomains */ 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 unsigned int 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 int (*power_off)(struct generic_pm_domain *domain); 46 int (*power_on)(struct generic_pm_domain *domain); 47 int (*start_device)(struct device *dev); 48 int (*stop_device)(struct device *dev); 49 bool (*active_wakeup)(struct device *dev); 50 }; 51 52 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) 53 { 54 return container_of(pd, struct generic_pm_domain, domain); 55 } 56 57 struct dev_list_entry { 58 struct list_head node; 59 struct device *dev; 60 bool need_restore; 61 }; 62 63 #ifdef CONFIG_PM_GENERIC_DOMAINS 64 extern int pm_genpd_add_device(struct generic_pm_domain *genpd, 65 struct device *dev); 66 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd, 67 struct device *dev); 68 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 69 struct generic_pm_domain *new_subdomain); 70 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 71 struct generic_pm_domain *target); 72 extern void pm_genpd_init(struct generic_pm_domain *genpd, 73 struct dev_power_governor *gov, bool is_off); 74 extern int pm_genpd_poweron(struct generic_pm_domain *genpd); 75 #else 76 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd, 77 struct device *dev) 78 { 79 return -ENOSYS; 80 } 81 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd, 82 struct device *dev) 83 { 84 return -ENOSYS; 85 } 86 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 87 struct generic_pm_domain *new_sd) 88 { 89 return -ENOSYS; 90 } 91 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 92 struct generic_pm_domain *target) 93 { 94 return -ENOSYS; 95 } 96 static inline void pm_genpd_init(struct generic_pm_domain *genpd, 97 struct dev_power_governor *gov, bool is_off) {} 98 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd) 99 { 100 return -ENOSYS; 101 } 102 #endif 103 104 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME 105 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd); 106 extern void pm_genpd_poweroff_unused(void); 107 #else 108 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {} 109 static inline void pm_genpd_poweroff_unused(void) {} 110 #endif 111 112 #endif /* _LINUX_PM_DOMAIN_H */ 113