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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
14enum 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
21struct dev_power_governor {
22 bool (*power_down_ok)(struct dev_pm_domain *domain);
23};
24
25struct 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
52static 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
57struct dev_list_entry {
58 struct list_head node;
59 struct device *dev;
60 bool need_restore;
61};
62
63#ifdef CONFIG_PM_GENERIC_DOMAINS
64extern int pm_genpd_add_device(struct generic_pm_domain *genpd,
65 struct device *dev);
66extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
67 struct device *dev);
68extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
69 struct generic_pm_domain *new_subdomain);
70extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
71 struct generic_pm_domain *target);
72extern void pm_genpd_init(struct generic_pm_domain *genpd,
73 struct dev_power_governor *gov, bool is_off);
74extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
75#else
76static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
77 struct device *dev)
78{
79 return -ENOSYS;
80}
81static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
82 struct device *dev)
83{
84 return -ENOSYS;
85}
86static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
87 struct generic_pm_domain *new_sd)
88{
89 return -ENOSYS;
90}
91static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
92 struct generic_pm_domain *target)
93{
94 return -ENOSYS;
95}
96static inline void pm_genpd_init(struct generic_pm_domain *genpd,
97 struct dev_power_governor *gov, bool is_off) {}
98static 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
105extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
106extern void pm_genpd_poweroff_unused(void);
107#else
108static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
109static inline void pm_genpd_poweroff_unused(void) {}
110#endif
111
112#endif /* _LINUX_PM_DOMAIN_H */