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/* $Id: power.c,v 1.4 1999/08/31 18:22:05 davem Exp $
* power.c: Power management driver.
*
* Copyright (C) 1999 David S. Miller (davem@redhat.com)
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/delay.h>
#include <asm/ebus.h>
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>
#ifdef CONFIG_PCI
static unsigned long power_reg = 0UL;
#define POWER_SYSTEM_OFF (1 << 0)
#define POWER_COURTESY_OFF (1 << 1)
static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
static int button_pressed = 0;
static void power_handler(int irq, void *dev_id, struct pt_regs *regs)
{
if (button_pressed == 0) {
wake_up(&powerd_wait);
button_pressed = 1;
}
}
#endif /* CONFIG_PCI */
extern void machine_halt(void);
void machine_power_off(void)
{
#ifdef CONFIG_PCI
if (power_reg != 0UL) {
/* Both register bits seem to have the
* same effect, so until I figure out
* what the difference is...
*/
writel(POWER_COURTESY_OFF | POWER_SYSTEM_OFF, power_reg);
}
#endif /* CONFIG_PCI */
machine_halt();
}
#ifdef CONFIG_PCI
static int powerd(void *__unused)
{
static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
char *argv[] = { "/usr/bin/shutdown", "-h", "now", NULL };
current->session = 1;
current->pgrp = 1;
sprintf(current->comm, "powerd");
again:
while(button_pressed == 0) {
spin_lock_irq(¤t->sigmask_lock);
flush_signals(current);
spin_unlock_irq(¤t->sigmask_lock);
interruptible_sleep_on(&powerd_wait);
}
/* Ok, down we go... */
if (execve("/usr/bin/shutdown", argv, envp) < 0) {
printk("powerd: shutdown execution failed\n");
button_pressed = 0;
goto again;
}
return 0;
}
void __init power_init(void)
{
struct linux_ebus *ebus;
struct linux_ebus_device *edev;
for_each_ebus(ebus) {
for_each_ebusdev(edev, ebus) {
if (!strcmp(edev->prom_name, "power"))
goto found;
}
}
return;
found:
power_reg = edev->resource[0].start;
printk("power: Control reg at %016lx ... ", power_reg);
if (kernel_thread(powerd, 0, CLONE_FS) < 0) {
printk("Failed to start power daemon.\n");
return;
}
printk("powerd running.\n");
if (request_irq(edev->irqs[0],
power_handler, SA_SHIRQ, "power",
(void *) power_reg) < 0)
printk("power: Error, cannot register IRQ handler.\n");
}
#endif /* CONFIG_PCI */
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