From bd804eba1c8597cbb7cd5a5f9fe886aae16a079a Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 19 Jul 2007 01:47:40 -0700 Subject: PM: Introduce pm_power_off_prepare 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 Acked-by: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/sys.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'kernel') diff --git a/kernel/sys.c b/kernel/sys.c index 18987c7f6add..d40e40a9446c 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -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(); } -- cgit v1.2.3