Consolidate ACPI and APM sysrq implementations.

Each power management scheme was implmenting a sysrq callback for 'o' which
would call their respective power off routines. 

This moves the installation of the sysrq handler to kernel/pm.c, and calls
pm_power_off(), which will work for any platform that has that method
defined. 

arch/i386/kernel/apm.c

@@ -226,8 +226,6 @@
 #include <asm/uaccess.h>
 #include <asm/desc.h>
 
-#include <linux/sysrq.h>
-
 extern spinlock_t i8253_lock;
 extern unsigned long get_cmos_time(void);
 extern void machine_real_restart(unsigned char *, int);
@@ -972,30 +970,6 @@ static void apm_power_off(void)
 		(void) set_system_power_state(APM_STATE_OFF);
 }
 
-/**
- * handle_poweroff	-	sysrq callback for power down
- * @key: key pressed (unused)
- * @pt_regs: register state (unused)
- * @kbd: keyboard state (unused)
- * @tty: tty involved (unused)
- *
- * When the user hits Sys-Rq o to power down the machine this is the
- * callback we use.
- */
-
-static void handle_poweroff (int key, struct pt_regs *pt_regs,
-			     struct tty_struct *tty)
-{
-        apm_power_off();
-}
-
-static struct sysrq_key_op	sysrq_poweroff_op = {
-	.handler        = handle_poweroff,
-	.help_msg       = "Off",
-	.action_msg     = "Power Off\n"
-};
-
-
 #ifdef CONFIG_APM_DO_ENABLE
 
 /**
@@ -1848,7 +1822,6 @@ static int apm(void *unused)
 	/* Install our power off handler.. */
 	if (power_off)
 		pm_power_off = apm_power_off;
-	register_sysrq_key('o', &sysrq_poweroff_op);
 
 	if (num_online_cpus() == 1 || smp) {
 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
@@ -2096,7 +2069,6 @@ static void __exit apm_exit(void)
 	}
 	misc_deregister(&apm_device);
 	remove_proc_entry("apm", NULL);
-	unregister_sysrq_key('o',&sysrq_poweroff_op);
 	if (power_off)
 		pm_power_off = NULL;
 	exit_kapmd = 1;

drivers/acpi/sleep/main.c

@@ -8,8 +8,6 @@
  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  */
 
-#include <linux/kernel.h>
-#include <linux/sysrq.h>
 #include <linux/delay.h>
 #include <linux/irq.h>
 #include <linux/pm.h>
@@ -265,23 +263,6 @@ acpi_suspend (
 	return status;
 }
 
-#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_PM)
-
-/* Simple wrapper calling power down function. */
-static void acpi_sysrq_power_off(int key, struct pt_regs *pt_regs,
-	struct tty_struct *tty)
-{
-	acpi_power_off();
-}
-
-struct sysrq_key_op sysrq_acpi_poweroff_op = {
-	.handler =	&acpi_sysrq_power_off,
-	.help_msg =	"Off",
-	.action_msg =	"Power Off\n"
-};
-
-#endif  /* CONFIG_MAGIC_SYSRQ */
-
 static int __init acpi_sleep_init(void)
 {
 	acpi_status		status = AE_OK;
@@ -308,7 +289,6 @@ static int __init acpi_sleep_init(void)
 	/* Install the soft-off (S5) handler. */
 	if (sleep_states[ACPI_STATE_S5]) {
 		pm_power_off = acpi_power_off;
-		register_sysrq_key('o', &sysrq_acpi_poweroff_op);
 
 		/* workaround: some systems don't claim S4 support, but they
                    do support S5 (power-down). That is all we need, so

kernel/pm.c

@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/pm.h>
 #include <linux/interrupt.h>
+#include <linux/sysrq.h>
 
 int pm_active;
 
@@ -292,3 +293,41 @@ EXPORT_SYMBOL(pm_send);
 EXPORT_SYMBOL(pm_send_all);
 EXPORT_SYMBOL(pm_find);
 EXPORT_SYMBOL(pm_active);
+
+
+#ifdef CONFIG_MAGIC_SYSRQ
+
+/**
+ * handle_poweroff	-	sysrq callback for power down
+ * @key: key pressed (unused)
+ * @pt_regs: register state (unused)
+ * @kbd: keyboard state (unused)
+ * @tty: tty involved (unused)
+ *
+ * When the user hits Sys-Rq o to power down the machine this is the
+ * callback we use.
+ */
+
+static void handle_poweroff (int key, struct pt_regs *pt_regs,
+			     struct tty_struct *tty)
+{
+	if (pm_power_off)
+		pm_power_off();
+}
+
+static struct sysrq_key_op	sysrq_poweroff_op = {
+	.handler        = handle_poweroff,
+	.help_msg       = "powerOff",
+	.action_msg     = "Power Off\n"
+};
+
+#endif  /* CONFIG_MAGIC_SYSRQ */
+
+
+static int pm_init(void)
+{
+	register_sysrq_key('o', &sysrq_poweroff_op);
+	return 0;
+}
+
+subsys_initcall(pm_init);