acpi sleep: divorce sleep functionality from power off functionality.

When ACPI turns the system off on shutdown, it actually enters S5, a sleep
state. This functionality is dependent on CONFIG_ACPI_SLEEP, which is 
dependent on CONFIG_SOFTWARE_SUSPEND.

This patch breaks the power off functionality into a separate file, and 
removes the dependency on the above-mentioned crap. Finally, power off works
for me again. 

Thanks to Tobias Ringstrom for the original patch.

drivers/acpi/Makefile

@@ -30,6 +30,7 @@ obj-$(CONFIG_ACPI_INTERPRETER)	+= osl.o utils.o \
 #
 # ACPI Bus and Device Drivers
 #
+obj-y				+= sleep/
 obj-$(CONFIG_ACPI_BUS)		+= bus.o
 obj-$(CONFIG_ACPI_AC) 		+= ac.o
 obj-$(CONFIG_ACPI_BATTERY)	+= battery.o
@@ -42,7 +43,6 @@ obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o
 obj-$(CONFIG_ACPI_THERMAL)	+= thermal.o
 obj-$(CONFIG_ACPI_SYSTEM)	+= system.o event.o
 obj-$(CONFIG_ACPI_DEBUG)	+= debug.o
-obj-$(CONFIG_ACPI_SLEEP)	+= sleep/
 obj-$(CONFIG_ACPI_NUMA)		+= numa.o
 obj-$(CONFIG_ACPI_TOSHIBA)	+= toshiba_acpi.o
 obj-$(CONFIG_ACPI_BUS)		+= scan.o 

drivers/acpi/sleep/Makefile

-obj-y			:= main.o 
+obj-y				:= poweroff.o
+obj-$(CONFIG_ACPI_SLEEP)	+= main.o
 obj-$(CONFIG_PROC_FS)		+= proc.o
 
 EXTRA_CFLAGS += $(ACPI_CFLAGS)

drivers/acpi/sleep/main.c

 /*
  * sleep.c - ACPI sleep support.
  * 
- *  Copyright (c) 2000-2002 Patrick Mochel
+ *  Copyright (c) 2000-2003 Patrick Mochel
  *
  *  Portions are
  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
@@ -10,15 +10,9 @@
 
 #include <linux/delay.h>
 #include <linux/irq.h>
-#include <linux/pm.h>
 #include <linux/device.h>
 #include <linux/suspend.h>
-
-#include <asm/acpi.h>
-
 #include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
-
 #include "sleep.h"
 
 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
@@ -26,14 +20,6 @@ ACPI_MODULE_NAME		("sleep")
 
 u8 sleep_states[ACPI_S_STATE_COUNT];
 
-static void
-acpi_power_off (void)
-{
-	acpi_enter_sleep_state_prep(ACPI_STATE_S5);
-	ACPI_DISABLE_IRQS();
-	acpi_enter_sleep_state(ACPI_STATE_S5);
-}
-
 /**
  * acpi_system_restore_state - OS-specific restoration of state
  * @state:	sleep state we're exiting
@@ -265,7 +251,6 @@ acpi_suspend (
 
 static int __init acpi_sleep_init(void)
 {
-	acpi_status		status = AE_OK;
 	int			i = 0;
 
 	ACPI_FUNCTION_TRACE("acpi_system_add_fs");
@@ -275,6 +260,7 @@ static int __init acpi_sleep_init(void)
 
 	printk(KERN_INFO PREFIX "(supports");
 	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);
 		if (ACPI_SUCCESS(status)) {
@@ -286,16 +272,6 @@ static int __init acpi_sleep_init(void)
 
 	acpi_sleep_proc_init();
 
-	/* Install the soft-off (S5) handler. */
-	if (sleep_states[ACPI_STATE_S5]) {
-		pm_power_off = acpi_power_off;
-
-		/* workaround: some systems don't claim S4 support, but they
-                   do support S5 (power-down). That is all we need, so
-		   indicate support. */
-		sleep_states[ACPI_STATE_S4] = 1;
-	}
-
 	return_VALUE(0);
 }
 

drivers/acpi/sleep/poweroff.c

+/*
+ * poweroff.c - ACPI handler for powering off the system.
+ *
+ * AKA S5, but it is independent of whether or not the kernel supports
+ * any other sleep support in the system.
+ */
+
+#include <linux/pm.h>
+#include <linux/init.h>
+#include <acpi/acpi_bus.h>
+
+static void
+acpi_power_off (void)
+{
+	printk("%s called\n",__FUNCTION__);
+	acpi_enter_sleep_state_prep(ACPI_STATE_S5);
+	ACPI_DISABLE_IRQS();
+	acpi_enter_sleep_state(ACPI_STATE_S5);
+}
+
+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))
+			pm_power_off = acpi_power_off;
+	}
+	return 0;
+}
+
+late_initcall(acpi_poweroff_init);