1 files changed, 134 insertions, 0 deletions
diff --git a/arch/x86/mach-voyager/voyager_thread.c b/arch/x86/mach-voyager/voyager_thread.c
new file mode 100644
index 00000000000..f9d59533815
--- /dev/null
+++ b/arch/x86/mach-voyager/voyager_thread.c
@@ -0,0 +1,134 @@
+/* -*- 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 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 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);