ARM: tegra: add sysfs support for tegra cpuquiet driver
[linux-2.6.git] / 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_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 */