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Introduce CONFIG_SUSPEND for suspend-to-Ram and standby

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Introduce CONFIG_SUSPEND representing the ability to enter system sleep
states, such as the ACPI S3 state, and allow the user to choose SUSPEND
and HIBERNATION independently of each other.

Make HOTPLUG_CPU be selected automatically if SUSPEND or HIBERNATION has
been chosen and the kernel is intended for SMP systems.

Also, introduce CONFIG_PM_SLEEP which is automatically selected if
CONFIG_SUSPEND or CONFIG_HIBERNATION is set and use it to select the
code needed for both suspend and hibernation.

The top-level power management headers and the ACPI code related to
suspend and hibernation are modified to use the new definitions (the
changes in drivers/acpi/sleep/main.c are, mostly, moving code to reduce
the number of ifdefs).

There are many other files in which CONFIG_PM can be replaced with
CONFIG_PM_SLEEP or even with CONFIG_SUSPEND, but they can be updated in
the future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki
2007-07-29 23:27:18 +02:00
committed by Linus Torvalds
parent b0cb1a19d0
commit 296699de6b
17 changed files with 164 additions and 86 deletions
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26
kernel/power/main.c
View File

@@ -25,11 +25,13 @@
BLOCKING_NOTIFIER_HEAD(pm_chain_head);
/*This is just an arbitrary number */
#define FREE_PAGE_NUMBER (100)
DEFINE_MUTEX(pm_mutex);
#ifdef CONFIG_SUSPEND
/* This is just an arbitrary number */
#define FREE_PAGE_NUMBER (100)
struct pm_ops *pm_ops;
/**
@@ -269,6 +271,8 @@ int pm_suspend(suspend_state_t state)
EXPORT_SYMBOL(pm_suspend);
#endif /* CONFIG_SUSPEND */
decl_subsys(power,NULL,NULL);
@@ -285,13 +289,15 @@ decl_subsys(power,NULL,NULL);
static ssize_t state_show(struct kset *kset, char *buf)
{
char *s = buf;
#ifdef CONFIG_SUSPEND
int i;
char * s = buf;
for (i = 0; i < PM_SUSPEND_MAX; i++) {
if (pm_states[i] && valid_state(i))
s += sprintf(s,"%s ", pm_states[i]);
}
#endif
#ifdef CONFIG_HIBERNATION
s += sprintf(s, "%s\n", "disk");
#else
@@ -304,11 +310,13 @@ static ssize_t state_show(struct kset *kset, char *buf)
static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
{
#ifdef CONFIG_SUSPEND
suspend_state_t state = PM_SUSPEND_STANDBY;
const char * const *s;
#endif
char *p;
int error;
int len;
int error = -EINVAL;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
@@ -316,17 +324,19 @@ static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
/* First, check if we are requested to hibernate */
if (len == 4 && !strncmp(buf, "disk", len)) {
error = hibernate();
return error ? error : n;
goto Exit;
}
#ifdef CONFIG_SUSPEND
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
break;
}
if (state < PM_SUSPEND_MAX && *s)
error = enter_state(state);
else
error = -EINVAL;
#endif
Exit:
return error ? error : n;
}