parisc: lasi: Register LASI power-off feature as sys_off_handler

Prefer the Linux kernel sys_off_handler functionality over a
home-grown implementation.
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/process.c

@@ -97,18 +97,12 @@ void machine_restart(char *cmd)
 
 }
 
-void (*chassis_power_off)(void);
-
 /*
  * This routine is called from sys_reboot to actually turn off the
  * machine 
  */
 void machine_power_off(void)
 {
-	/* If there is a registered power off handler, call it. */
-	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
 	 * following call will immediately power off. */

drivers/parisc/lasi.c

@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/pm.h>
 #include <linux/types.h>
+#include <linux/reboot.h>
 
 #include <asm/io.h>
 #include <asm/hardware.h>
@@ -145,23 +146,19 @@ static void __init lasi_led_init(unsigned long lasi_hpa)
  * 1 to PWR_ON_L in the Power Control Register
  * 
  */
-
-static unsigned long lasi_power_off_hpa __read_mostly;
-
-static void lasi_power_off(void)
+static int lasi_power_off(struct sys_off_data *data)
 {
-	unsigned long datareg;
+	struct gsc_asic *lasi = data->cb_data;
 
-	/* calculate addr of the Power Control Register */
-	datareg = lasi_power_off_hpa + 0x0000C000;
+	/* Power down the machine via Power Control Register */
+	gsc_writel(0x02, lasi->hpa + 0x0000C000);
 
-	/* Power down the machine */
-	gsc_writel(0x02, datareg);
+	/* might not be reached: */
+	return NOTIFY_DONE;
 }
 
 static int __init lasi_init_chip(struct parisc_device *dev)
 {
-	extern void (*chassis_power_off)(void);
 	struct gsc_asic *lasi;
 	int ret;
 
@@ -212,13 +209,10 @@ static int __init lasi_init_chip(struct parisc_device *dev)
 
 	gsc_fixup_irqs(dev, lasi, lasi_choose_irq);
 
-	/* initialize the power off function */
-	/* FIXME: Record the LASI HPA for the power off function.  This should
-	 * ensure that only the first LASI (the one controlling the power off)
-	 * should set the HPA here */
-	lasi_power_off_hpa = lasi->hpa;
-	chassis_power_off = lasi_power_off;
-	
+	/* register the LASI power off function */
+	register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+		SYS_OFF_PRIO_DEFAULT, lasi_power_off, lasi);
+
 	return ret;
 }