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/* -*- mode: c; c-basic-offset: 8 -*- */
/* Copyright (C) 2001
*
* Author: J.E.J.Bottomley@HansenPartnership.com
*
* This module provides the machine status monitor thread for the
* voyager architecture. This allows us to monitor the machine
* environment (temp, voltage, fan function) and the front panel and
* internal UPS. If a fault is detected, this thread takes corrective
* action (usually just informing init)
* */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#include <linux/mc146818rtc.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/kmod.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <asm/desc.h>
#include <asm/voyager.h>
#include <asm/vic.h>
#include <asm/mtrr.h>
#include <asm/msr.h>
struct task_struct *voyager_thread;
static __u8 set_timeout;
static int execute(const char *string)
{
int ret;
char *envp[] = {
"HOME=/",
"TERM=linux",
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
NULL,
};
char *argv[] = {
"/bin/bash",
"-c",
(char *)string,
NULL,
};
if ((ret =
call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC)) != 0) {
printk(KERN_ERR "Voyager failed to run \"%s\": %i\n", string,
ret);
}
return ret;
}
static void check_from_kernel(void)
{
if (voyager_status.switch_off) {
/* FIXME: This should be configurable via proc */
execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1");
} else if (voyager_status.power_fail) {
VDEBUG(("Voyager daemon detected AC power failure\n"));
/* FIXME: This should be configureable via proc */
execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1");
set_timeout = 1;
}
}
static void check_continuing_condition(void)
{
if (voyager_status.power_fail) {
__u8 data;
voyager_cat_psi(VOYAGER_PSI_SUBREAD,
VOYAGER_PSI_AC_FAIL_REG, &data);
if ((data & 0x1f) == 0) {
/* all power restored */
printk(KERN_NOTICE
"VOYAGER AC power restored, cancelling shutdown\n");
/* FIXME: should be user configureable */
execute
("umask 600; echo O > /etc/powerstatus; kill -PWR 1");
set_timeout = 0;
}
}
}
static int thread(void *unused)
{
printk(KERN_NOTICE "Voyager starting monitor thread\n");
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(set_timeout ? HZ : MAX_SCHEDULE_TIMEOUT);
VDEBUG(("Voyager Daemon awoken\n"));
if (voyager_status.request_from_kernel == 0) {
/* probably awoken from timeout */
check_continuing_condition();
} else {
check_from_kernel();
voyager_status.request_from_kernel = 0;
}
}
}
static int __init voyager_thread_start(void)
{
voyager_thread = kthread_run(thread, NULL, "kvoyagerd");
if (IS_ERR(voyager_thread)) {
printk(KERN_ERR
"Voyager: Failed to create system monitor thread.\n");
return PTR_ERR(voyager_thread);
}
return 0;
}
static void __exit voyager_thread_stop(void)
{
kthread_stop(voyager_thread);
}
module_init(voyager_thread_start);
module_exit(voyager_thread_stop);
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