diff options
Diffstat (limited to 'arch/i386/mach-voyager/voyager_thread.c')
| -rw-r--r-- | arch/i386/mach-voyager/voyager_thread.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/arch/i386/mach-voyager/voyager_thread.c b/arch/i386/mach-voyager/voyager_thread.c new file mode 100644 index 000000000000..9980eef31fda --- /dev/null +++ b/arch/i386/mach-voyager/voyager_thread.c @@ -0,0 +1,167 @@ +/* -*- 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/config.h> +#include <linux/mm.h> +#include <linux/kernel_stat.h> +#include <linux/delay.h> +#include <linux/mc146818rtc.h> +#include <linux/smp_lock.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/kmod.h> +#include <linux/completion.h> +#include <linux/sched.h> +#include <asm/desc.h> +#include <asm/voyager.h> +#include <asm/vic.h> +#include <asm/mtrr.h> +#include <asm/msr.h> + +#include <linux/irq.h> + +#define THREAD_NAME "kvoyagerd" + +/* external variables */ +int kvoyagerd_running = 0; +DECLARE_MUTEX_LOCKED(kvoyagerd_sem); + +static int thread(void *); + +static __u8 set_timeout = 0; + +/* Start the machine monitor thread. Return 1 if OK, 0 if fail */ +static int __init +voyager_thread_start(void) +{ + if(kernel_thread(thread, NULL, CLONE_KERNEL) < 0) { + /* This is serious, but not fatal */ + printk(KERN_ERR "Voyager: Failed to create system monitor thread!!!\n"); + return 1; + } + return 0; +} + +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, 1)) != 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 configureable 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 void +wakeup(unsigned long unused) +{ + up(&kvoyagerd_sem); +} + +static int +thread(void *unused) +{ + struct timer_list wakeup_timer; + + kvoyagerd_running = 1; + + reparent_to_init(); + daemonize(THREAD_NAME); + + set_timeout = 0; + + init_timer(&wakeup_timer); + + sigfillset(¤t->blocked); + current->signal->tty = NULL; + + printk(KERN_NOTICE "Voyager starting monitor thread\n"); + + for(;;) { + down_interruptible(&kvoyagerd_sem); + 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; + } + if(set_timeout) { + del_timer(&wakeup_timer); + wakeup_timer.expires = HZ + jiffies; + wakeup_timer.function = wakeup; + add_timer(&wakeup_timer); + } + } +} + +static void __exit +voyager_thread_stop(void) +{ + /* FIXME: do nothing at the moment */ +} + +module_init(voyager_thread_start); +//module_exit(voyager_thread_stop); |