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PM: Separate hibernation code from suspend code

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[ With Johannes Berg <johannes@sipsolutions.net> ]

Separate the hibernation (aka suspend to disk code) from the other suspend
code.  In particular:

 * Remove the definitions related to hibernation from include/linux/pm.h
 * Introduce struct hibernation_ops and a new hibernate() function to hibernate
   the system, defined in include/linux/suspend.h
 * Separate suspend code in kernel/power/main.c from hibernation-related code
   in kernel/power/disk.c and kernel/power/user.c (with the help of
   hibernation_ops)
 * Switch ACPI (the only user of pm_ops.pm_disk_mode) to hibernation_ops

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Greg KH <greg@kroah.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki 2007-05-09 02:33:18 -07:00 • committed by Linus Torvalds
parent d60846c4d1
commit a3d25c275d
11 changed files with 227 additions and 186 deletions
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31
include/linux/pm.h
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@ -107,26 +107,11 @@ typedef int __bitwise suspend_state_t;
#define PM_SUSPEND_ON ((__force suspend_state_t) 0)
#define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1)
#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
#define PM_SUSPEND_DISK ((__force suspend_state_t) 4)
#define PM_SUSPEND_MAX ((__force suspend_state_t) 5)
typedef int __bitwise suspend_disk_method_t;
/* invalid must be 0 so struct pm_ops initialisers can leave it out */
#define PM_DISK_INVALID ((__force suspend_disk_method_t) 0)
#define PM_DISK_PLATFORM ((__force suspend_disk_method_t) 1)
#define PM_DISK_SHUTDOWN ((__force suspend_disk_method_t) 2)
#define PM_DISK_REBOOT ((__force suspend_disk_method_t) 3)
#define PM_DISK_TEST ((__force suspend_disk_method_t) 4)
#define PM_DISK_TESTPROC ((__force suspend_disk_method_t) 5)
#define PM_DISK_MAX ((__force suspend_disk_method_t) 6)
#define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
/**
* struct pm_ops - Callbacks for managing platform dependent suspend states.
* @valid: Callback to determine whether the given state can be entered.
* If %CONFIG_SOFTWARE_SUSPEND is set then %PM_SUSPEND_DISK is
* always valid and never passed to this call. If not assigned,
* no suspend states are valid.
* Valid states are advertised in /sys/power/state but can still
* be rejected by prepare or enter if the conditions aren't right.
* There is a %pm_valid_only_mem function available that can be assigned
@ -140,24 +125,12 @@ typedef int __bitwise suspend_disk_method_t;
*
* @finish: Called when the system has left the given state and all devices
* are resumed. The return value is ignored.
*
* @pm_disk_mode: The generic code always allows one of the shutdown methods
* %PM_DISK_SHUTDOWN, %PM_DISK_REBOOT, %PM_DISK_TEST and
* %PM_DISK_TESTPROC. If this variable is set, the mode it is set
* to is allowed in addition to those modes and is also made default.
* When this mode is sent selected, the @prepare call will be called
* before suspending to disk (if present), the @enter call should be
* present and will be called after all state has been saved and the
* machine is ready to be powered off; the @finish callback is called
* after state has been restored. All these calls are called with
* %PM_SUSPEND_DISK as the state.
*/
struct pm_ops {
int (*valid)(suspend_state_t state);
int (*prepare)(suspend_state_t state);
int (*enter)(suspend_state_t state);
int (*finish)(suspend_state_t state);
suspend_disk_method_t pm_disk_mode;
};
/**
@ -276,8 +249,6 @@ extern void device_power_up(void);
extern void device_resume(void);
#ifdef CONFIG_PM
extern suspend_disk_method_t pm_disk_mode;
extern int device_suspend(pm_message_t state);
extern int device_prepare_suspend(pm_message_t state);