[PARISC] Add chassis_power_off routine

Define a chassis_power_off routine that machines which have a way
to turn off the power supply can hook into. Formerly they were
using pm_power_off, which is now being used by generic code. Make
lasi.c use chassis_power_off instead of pm_power_off.

Note, all machines need to call machine_power_off so that the
switch can power off the machine, though halt -p may not necessarily
be able to work properly on the machine.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

arch/parisc/kernel/process.c

@@ -54,12 +54,6 @@
 #include <asm/uaccess.h>
 #include <asm/unwind.h>
 
-/*
- * Power off function, if any
- */ 
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
 void default_idle(void)
 {
 	barrier();
@@ -142,6 +136,7 @@ void machine_halt(void)
 	*/
 }
 
+void (*chassis_power_off)(void);
 
 /*
  * This routine is called from sys_reboot to actually turn off the
@@ -150,8 +145,8 @@ void machine_halt(void)
 void machine_power_off(void)
 {
 	/* If there is a registered power off handler, call it. */
-	if(pm_power_off)
-		pm_power_off();
+	if (chassis_power_off)
+		chassis_power_off();
 
 	/* Put the soft power button back under hardware control.
 	 * If the user had already pressed the power button, the
@@ -167,6 +162,8 @@ void machine_power_off(void)
 	       KERN_EMERG "Please power this system off now.");
 }
 
+void (*pm_power_off)(void) = machine_power_off;
+EXPORT_SYMBOL(pm_power_off);
 
 /*
  * Create a kernel thread

drivers/parisc/lasi.c

@@ -166,6 +166,7 @@ static void lasi_power_off(void)
 int __init
 lasi_init_chip(struct parisc_device *dev)
 {
+	extern void (*chassis_power_off)(void);
 	struct gsc_asic *lasi;
 	struct gsc_irq gsc_irq;
 	int ret;
@@ -222,7 +223,7 @@ lasi_init_chip(struct parisc_device *dev)
 	 * ensure that only the first LASI (the one controlling the power off)
 	 * should set the HPA here */
 	lasi_power_off_hpa = lasi->hpa;
-	pm_power_off = lasi_power_off;
+	chassis_power_off = lasi_power_off;
 	
 	return ret;
 }