[Suspend2][ 2/4] [Suspend2] Try to powerdown using ACPI.

[Nigel Cunningham <nigel@suspend2.net>]

Try to powerdown by entering ACPI S3, S4 or S5.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/power_off.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/kernel/power/power_off.c b/kernel/power/power_off.c
index 8f9f425..7f7c565 100644
--- a/kernel/power/power_off.c
+++ b/kernel/power/power_off.c
@@ -24,3 +24,29 @@ extern struct pm_ops *pm_ops;
 /* Use suspend_enter from main.c */
 extern int suspend_enter(suspend_state_t state);
 
+int try_pm_state_powerdown(void)
+{
+	if (pm_ops && pm_ops->prepare && suspend_powerdown_method &&
+	    pm_ops->prepare(suspend_powerdown_method))
+			return 0;
+
+	if (suspend_powerdown_method > 3)
+		kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
+	else {
+		if (device_suspend(PMSG_SUSPEND)) {
+			printk(KERN_ERR "Some devices failed to suspend\n");
+			return 0;
+		}
+	}
+
+	if (suspend_enter(suspend_powerdown_method))
+		return 0;
+
+	device_resume();
+
+	if (pm_ops && pm_ops->finish && suspend_powerdown_method)
+		pm_ops->finish(suspend_powerdown_method);
+
+	return 1;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net