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(&current->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);