1 /* -*- mode: c; c-basic-offset: 8 -*- */
5 * Author: J.E.J.Bottomley@HansenPartnership.com
7 * linux/arch/i386/kernel/voyager_thread.c
9 * This module provides the machine status monitor thread for the
10 * voyager architecture. This allows us to monitor the machine
11 * environment (temp, voltage, fan function) and the front panel and
12 * internal UPS. If a fault is detected, this thread takes corrective
13 * action (usually just informing init)
16 #include <linux/module.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/delay.h>
20 #include <linux/mc146818rtc.h>
21 #include <linux/smp_lock.h>
22 #include <linux/init.h>
23 #include <linux/bootmem.h>
24 #include <linux/kmod.h>
25 #include <linux/completion.h>
26 #include <linux/sched.h>
27 #include <linux/kthread.h>
29 #include <asm/voyager.h>
35 struct task_struct *voyager_thread;
36 static __u8 set_timeout;
39 execute(const char *string)
46 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
56 if ((ret = call_usermodehelper(argv[0], argv, envp, 1)) != 0) {
57 printk(KERN_ERR "Voyager failed to run \"%s\": %i\n",
64 check_from_kernel(void)
66 if(voyager_status.switch_off) {
68 /* FIXME: This should be configureable via proc */
69 execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1");
70 } else if(voyager_status.power_fail) {
71 VDEBUG(("Voyager daemon detected AC power failure\n"));
73 /* FIXME: This should be configureable via proc */
74 execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1");
80 check_continuing_condition(void)
82 if(voyager_status.power_fail) {
84 voyager_cat_psi(VOYAGER_PSI_SUBREAD,
85 VOYAGER_PSI_AC_FAIL_REG, &data);
86 if((data & 0x1f) == 0) {
87 /* all power restored */
88 printk(KERN_NOTICE "VOYAGER AC power restored, cancelling shutdown\n");
89 /* FIXME: should be user configureable */
90 execute("umask 600; echo O > /etc/powerstatus; kill -PWR 1");
99 printk(KERN_NOTICE "Voyager starting monitor thread\n");
102 set_current_state(TASK_INTERRUPTIBLE);
103 schedule_timeout(set_timeout ? HZ : MAX_SCHEDULE_TIMEOUT);
105 VDEBUG(("Voyager Daemon awoken\n"));
106 if(voyager_status.request_from_kernel == 0) {
107 /* probably awoken from timeout */
108 check_continuing_condition();
111 voyager_status.request_from_kernel = 0;
117 voyager_thread_start(void)
119 voyager_thread = kthread_run(thread, NULL, "kvoyagerd");
120 if (IS_ERR(voyager_thread)) {
121 printk(KERN_ERR "Voyager: Failed to create system monitor thread.\n");
122 return PTR_ERR(voyager_thread);
129 voyager_thread_stop(void)
131 kthread_stop(voyager_thread);
134 module_init(voyager_thread_start);
135 module_exit(voyager_thread_stop);