[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>

3 files changed, 105 insertions, 51 deletions

diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 0a5d2a9..7249ba2 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -1,6 +1,7 @@
 /*
  * sleep.c - ACPI sleep support.
  *
+ * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
  * Copyright (c) 2000-2003 Patrick Mochel
  * Copyright (c) 2003 Open Source Development Lab
@@ -14,7 +15,6 @@
 #include <linux/dmi.h>
 #include <linux/device.h>
 #include <linux/suspend.h>
-#include <asm/io.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include "sleep.h"
@@ -27,10 +27,11 @@ extern void do_suspend_lowlevel_s4bios(void);
 extern void do_suspend_lowlevel(void);
 
 static u32 acpi_suspend_states[] = {
-	[PM_SUSPEND_ON]		= ACPI_STATE_S0,
-	[PM_SUSPEND_STANDBY]	= ACPI_STATE_S1,
-	[PM_SUSPEND_MEM]	= ACPI_STATE_S3,
-	[PM_SUSPEND_DISK]	= ACPI_STATE_S4,
+	[PM_SUSPEND_ON] = ACPI_STATE_S0,
+	[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
+	[PM_SUSPEND_MEM] = ACPI_STATE_S3,
+	[PM_SUSPEND_DISK] = ACPI_STATE_S4,
+	[PM_SUSPEND_MAX] = ACPI_STATE_S5
 };
 
 static int init_8259A_after_S1;
@@ -44,30 +45,20 @@ static int init_8259A_after_S1;
  *	wakeup code to the waking vector. 
  */
 
+extern int acpi_sleep_prepare(u32 acpi_state);
+extern void acpi_power_off(void);
+
 static int acpi_pm_prepare(suspend_state_t pm_state)
 {
 	u32 acpi_state = acpi_suspend_states[pm_state];
 
-	if (!sleep_states[acpi_state])
+	if (!sleep_states[acpi_state]) {
+		printk("acpi_pm_prepare does not support %d \n", pm_state);
 		return -EPERM;
-
-	/* 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 (pm_state == PM_SUSPEND_MEM || pm_state == PM_SUSPEND_DISK) {
-		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);
-	acpi_enter_sleep_state_prep(acpi_state);
-	return 0;
+	return acpi_sleep_prepare(acpi_state);
 }
 
-
 /**
  *	acpi_pm_enter - Actually enter a sleep state.
  *	@pm_state:		State we're entering.
@@ -92,11 +83,9 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 			return error;
 	}
 
-
 	local_irq_save(flags);
 	acpi_enable_wakeup_device(acpi_state);
-	switch (pm_state)
-	{
+	switch (pm_state) {
 	case PM_SUSPEND_STANDBY:
 		barrier();
 		status = acpi_enter_sleep_state(acpi_state);
@@ -112,6 +101,10 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 		else
 			do_suspend_lowlevel_s4bios();
 		break;
+	case PM_SUSPEND_MAX:
+		acpi_power_off();
+		break;
+
 	default:
 		return -EINVAL;
 	}
@@ -126,11 +119,9 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 	if (pm_state > PM_SUSPEND_STANDBY)
 		acpi_restore_state_mem();
 
-
 	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 }
 
-
 /**
  *	acpi_pm_finish - Finish up suspend sequence.
  *	@pm_state:		State we're coming out of.
@@ -156,27 +147,26 @@ static int acpi_pm_finish(suspend_state_t pm_state)
 	return 0;
 }
 
-
 int acpi_suspend(u32 acpi_state)
 {
 	suspend_state_t states[] = {
-		[1]	= PM_SUSPEND_STANDBY,
-		[3]	= PM_SUSPEND_MEM,
-		[4]	= PM_SUSPEND_DISK,
+		[1] = PM_SUSPEND_STANDBY,
+		[3] = PM_SUSPEND_MEM,
+		[4] = PM_SUSPEND_DISK,
+		[5] = PM_SUSPEND_MAX
 	};
 
-	if (acpi_state <= 4 && states[acpi_state])
+	if (acpi_state < 6 && states[acpi_state])
 		return pm_suspend(states[acpi_state]);
 	return -EINVAL;
 }
 
 static struct pm_ops acpi_pm_ops = {
-	.prepare	= acpi_pm_prepare,
-	.enter		= acpi_pm_enter,
-	.finish		= acpi_pm_finish,
+	.prepare = acpi_pm_prepare,
+	.enter = acpi_pm_enter,
+	.finish = acpi_pm_finish,
 };
 
-
 /*
  * Toshiba fails to preserve interrupts over S1, reinitialization
  * of 8259 is needed after S1 resume.
@@ -190,16 +180,16 @@ static int __init init_ints_after_s1(struct dmi_system_id *d)
 
 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 	{
-		.callback = init_ints_after_s1,
-		.ident = "Toshiba Satellite 4030cdt",
-		.matches = { DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"), },
-	},
-	{ },
+	 .callback = init_ints_after_s1,
+	 .ident = "Toshiba Satellite 4030cdt",
+	 .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
+	 },
+	{},
 };
 
 static int __init acpi_sleep_init(void)
 {
-	int			i = 0;
+	int i = 0;
 
 	dmi_check_system(acpisleep_dmi_table);
 
@@ -207,7 +197,7 @@ static int __init acpi_sleep_init(void)
 		return 0;
 
 	printk(KERN_INFO PREFIX "(supports");
-	for (i=0; i < ACPI_S_STATE_COUNT; i++) {
+	for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
 		acpi_status status;
 		u8 type_a, type_b;
 		status = acpi_get_sleep_type_data(i, &type_a, &type_b);
diff --git a/drivers/acpi/sleep/poweroff.c b/drivers/acpi/sleep/poweroff.c
index da23775..1fc86e6 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;
 }
diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index 9102e37..5474bf9 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -22,7 +22,6 @@
 #include <linux/string.h>
 #include <linux/pm.h>
 
-
 extern struct subsystem devices_subsys;
 
 #define to_sysdev(k) container_of(k, struct sys_device, kobj)