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_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 struct generic_pm_domain_data { 66 struct pm_domain_data base; 67 bool need_restore; 68 }; 69 70 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd) 71 { 72 return container_of(pdd, struct generic_pm_domain_data, base); 73 } 74 75 #ifdef CONFIG_PM_GENERIC_DOMAINS 76 extern int pm_genpd_add_device(struct generic_pm_domain *genpd, 77 struct device *dev); 78 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd, 79 struct device *dev); 80 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 81 struct generic_pm_domain *new_subdomain); 82 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 83 struct generic_pm_domain *target); 84 extern void pm_genpd_init(struct generic_pm_domain *genpd, 85 struct dev_power_governor *gov, bool is_off); 86 extern int pm_genpd_poweron(struct generic_pm_domain *genpd); 87 #else 88 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd, 89 struct device *dev) 90 { 91 return -ENOSYS; 92 } 93 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd, 94 struct device *dev) 95 { 96 return -ENOSYS; 97 } 98 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 99 struct generic_pm_domain *new_sd) 100 { 101 return -ENOSYS; 102 } 103 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 104 struct generic_pm_domain *target) 105 { 106 return -ENOSYS; 107 } 108 static inline void pm_genpd_init(struct generic_pm_domain *genpd, 109 struct dev_power_governor *gov, bool is_off) {} 110 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd) 111 { 112 return -ENOSYS; 113 } 114 #endif 115 116 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME 117 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd); 118 extern void pm_genpd_poweroff_unused(void); 119 #else 120 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {} 121 static inline void pm_genpd_poweroff_unused(void) {} 122 #endif 123 124 #endif /* _LINUX_PM_DOMAIN_H */ 125