Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* -*- mode: c; c-basic-offset: 8 -*- */

/* Copyright (C) 2001

 *

 * Author: J.E.J.Bottomley@HansenPartnership.com

 *

 * linux/arch/i386/kernel/voyager_thread.c

 *

 * 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);