[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 da237754ded9..1fc86e6b5ab9 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;
 }