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PM: Introduce pm_power_off_prepare

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Introduce the pm_power_off_prepare() callback that can be registered by the
interested platforms in analogy with pm_idle() and pm_power_off(), used for
preparing the system to power off (needed by ACPI).

This allows us to drop acpi_sysclass and device_acpi that are only defined in
order to register the ACPI power off preparation callback, which is needed by
pm_power_off() registered in a much different way.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
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 2007-07-19 01:47:40 -07:00 committed by Linus Torvalds
parent d7372cdf69
commit bd804eba1c
3 changed files with 19 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/acpi/sleep/poweroff.c
View File

@ -39,7 +39,13 @@ int acpi_sleep_prepare(u32 acpi_state)
#ifdef CONFIG_PM
void acpi_power_off(void)
static void acpi_power_off_prepare(void)
{
/* Prepare to power off the system */
acpi_sleep_prepare(ACPI_STATE_S5);
}
static void acpi_power_off(void)
{
/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
printk("%s called\n", __FUNCTION__);
@ -48,27 +54,6 @@ void acpi_power_off(void)
acpi_enter_sleep_state(ACPI_STATE_S5);
}
static int acpi_shutdown(struct sys_device *x)
{
switch (system_state) {
case SYSTEM_POWER_OFF:
/* Prepare to power off the system */
return acpi_sleep_prepare(ACPI_STATE_S5);
default:
return 0;
}
}
static struct sysdev_class acpi_sysclass = {
set_kset_name("acpi"),
.shutdown = acpi_shutdown
};
static struct sys_device device_acpi = {
.id = 0,
.cls = &acpi_sysclass,
};
static int acpi_poweroff_init(void)
{
if (!acpi_disabled) {
@ -78,13 +63,8 @@ static int acpi_poweroff_init(void)
status =
acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
if (ACPI_SUCCESS(status)) {
int error;
error = sysdev_class_register(&acpi_sysclass);
if (!error)
error = sysdev_register(&device_acpi);
if (!error)
pm_power_off = acpi_power_off;
return error;
pm_power_off_prepare = acpi_power_off_prepare;
pm_power_off = acpi_power_off;
}
}
return 0;

1
include/linux/pm.h
View File

@ -101,6 +101,7 @@ struct pm_dev
*/
extern void (*pm_idle)(void);
extern void (*pm_power_off)(void);
extern void (*pm_power_off_prepare)(void);
typedef int __bitwise suspend_state_t;

9
kernel/sys.c
View File

@ -99,6 +99,13 @@ int C_A_D = 1;
struct pid *cad_pid;
EXPORT_SYMBOL(cad_pid);
/*
* If set, this is used for preparing the system to power off.
*/
void (*pm_power_off_prepare)(void);
EXPORT_SYMBOL(pm_power_off_prepare);
/*
* Notifier list for kernel code which wants to be called
* at shutdown. This is used to stop any idling DMA operations
@ -867,6 +874,8 @@ EXPORT_SYMBOL_GPL(kernel_halt);
void kernel_power_off(void)
{
kernel_shutdown_prepare(SYSTEM_POWER_OFF);
if (pm_power_off_prepare)
pm_power_off_prepare();
printk(KERN_EMERG "Power down.\n");
machine_power_off();
}