[ACPI] ACPI poweroff fix

Register an "acpi" system device to be notified of shutdown preparation.
This depends on CONFIG_PM

http://bugzilla.kernel.org/show_bug.cgi?id=4041

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 73 insertions, 8 deletions

diff --git a/drivers/acpi/sleep/poweroff.c b/drivers/acpi/sleep/poweroff.c
index da237754ded..1fc86e6b5ab 100644
--- a/drivers/acpi/sleep/poweroff.c
+++ b/drivers/acpi/sleep/poweroff.c
@@ -3,35 +3,100 @@
  *
  * AKA S5, but it is independent of whether or not the kernel supports
  * any other sleep support in the system.
+ *
+ * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
+ *
+ * This file is released under the GPLv2.
  */
 
 #include <linux/pm.h>
 #include <linux/init.h>
 #include <acpi/acpi_bus.h>
 #include <linux/sched.h>
+#include <linux/sysdev.h>
+#include <asm/io.h>
 #include "sleep.h"
 
-static void
-acpi_power_off (void)
+int acpi_sleep_prepare(u32 acpi_state)
+{
+	/* Flag to do not allow second time invocation for S5 state */
+	static int shutdown_prepared = 0;
+#ifdef CONFIG_ACPI_SLEEP
+	/* do we have a wakeup address for S2 and S3? */
+	/* Here, we support only S4BIOS, those we set the wakeup address */
+	/* S4OS is only supported for now via swsusp.. */
+	if (acpi_state == ACPI_STATE_S3 || acpi_state == ACPI_STATE_S4) {
+		if (!acpi_wakeup_address) {
+			return -EFAULT;
+		}
+		acpi_set_firmware_waking_vector((acpi_physical_address)
+						virt_to_phys((void *)
+							     acpi_wakeup_address));
+
+	}
+	ACPI_FLUSH_CPU_CACHE();
+	acpi_enable_wakeup_device_prep(acpi_state);
+#endif
+	if (acpi_state == ACPI_STATE_S5) {
+		/* Check if we were already called */
+		if (shutdown_prepared)
+			return 0;
+		acpi_wakeup_gpe_poweroff_prepare();
+		shutdown_prepared = 1;
+	}
+	acpi_enter_sleep_state_prep(acpi_state);
+	return 0;
+}
+
+void acpi_power_off(void)
 {
-	printk("%s called\n",__FUNCTION__);
+	printk("%s called\n", __FUNCTION__);
+	acpi_sleep_prepare(ACPI_STATE_S5);
+	local_irq_disable();
 	/* Some SMP machines only can poweroff in boot CPU */
 	set_cpus_allowed(current, cpumask_of_cpu(0));
-	acpi_wakeup_gpe_poweroff_prepare();
-	acpi_enter_sleep_state_prep(ACPI_STATE_S5);
-	ACPI_DISABLE_IRQS();
 	acpi_enter_sleep_state(ACPI_STATE_S5);
 }
 
+#ifdef CONFIG_PM
+
+static int acpi_shutdown(struct sys_device *x)
+{
+	return acpi_sleep_prepare(ACPI_STATE_S5);
+}
+
+static struct sysdev_class acpi_sysclass = {
+	set_kset_name("acpi"),
+	.shutdown = acpi_shutdown
+};
+
+static struct sys_device device_acpi = {
+	.id = 0,
+	.cls = &acpi_sysclass,
+};
+
+#endif
+
 static int acpi_poweroff_init(void)
 {
 	if (!acpi_disabled) {
 		u8 type_a, type_b;
 		acpi_status status;
 
-		status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
-		if (ACPI_SUCCESS(status))
+		status =
+		    acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
+		if (ACPI_SUCCESS(status)) {
 			pm_power_off = acpi_power_off;
+#ifdef CONFIG_PM
+			{
+				int error;
+				error = sysdev_class_register(&acpi_sysclass);
+				if (!error)
+					error = sysdev_register(&device_acpi);
+				return error;
+			}
+#endif
+		}
 	}
 	return 0;
 }