patch-2.3.16 linux/arch/sparc64/kernel/power.c

• Lines: 106
• Date: Tue Aug 31 11:23:30 1999
• Orig file: v2.3.15/linux/arch/sparc64/kernel/power.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/arch/sparc64/kernel/power.c linux/arch/sparc64/kernel/power.c
@@ -0,0 +1,105 @@
+/* $Id: power.c,v 1.2 1999/08/31 04:39:38 davem Exp $
+ * power.c: Power management driver.
+ *
+ * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/delay.h>
+
+#include <asm/ebus.h>
+
+#define __KERNEL_SYSCALLS__
+#include <linux/unistd.h>
+
+#ifdef CONFIG_PCI
+static unsigned long power_reg = 0UL;
+#define POWER_SYSTEM_OFF (1 << 0)
+#define POWER_COURTESY_OFF (1 << 1)
+
+static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
+static int button_pressed = 0;
+
+static void power_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+	if (button_pressed == 0) {
+		wake_up(&powerd_wait);
+		button_pressed = 1;
+	}
+}
+#endif /* CONFIG_PCI */
+
+extern void machine_halt(void);
+
+void machine_power_off(void)
+{
+#ifdef CONFIG_PCI
+	if (power_reg != 0UL) {
+		/* Both register bits seem to have the
+		 * same effect, so until I figure out
+		 * what the difference is...
+		 */
+		writel(POWER_COURTESY_OFF | POWER_SYSTEM_OFF, power_reg);
+	}
+#endif /* CONFIG_PCI */
+	machine_halt();
+}
+
+#ifdef CONFIG_PCI
+static int powerd(void *__unused)
+{
+	static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
+	char *argv[] = { "/usr/bin/shutdown", "-h", "now", NULL };
+
+	current->session = 1;
+	current->pgrp = 1;
+	sprintf(current->comm, "powerd");
+
+again:
+	while(button_pressed == 0) {
+		spin_lock_irq(&current->sigmask_lock);
+		flush_signals(current);
+		spin_unlock_irq(&current->sigmask_lock);
+		interruptible_sleep_on(&powerd_wait);
+	}
+
+	/* Ok, down we go... */
+	if (execve("/usr/bin/shutdown", argv, envp) < 0) {
+		printk("powerd: shutdown execution failed\n");
+		button_pressed = 0;
+		goto again;
+	}
+	return 0;
+}
+
+void __init power_init(void)
+{
+	struct linux_ebus *ebus;
+	struct linux_ebus_device *edev;
+
+	for_each_ebus(ebus) {
+		for_each_ebusdev(edev, ebus) {
+			if (!strcmp(edev->prom_name, "power"))
+				goto found;
+		}
+	}
+	return;
+
+found:
+	power_reg = edev->resource[0].start;
+	printk("power: Control reg at %016lx ... ", power_reg);
+	if (kernel_thread(powerd, 0, CLONE_FS) < 0) {
+		printk("Failed to start power daemon.\n");
+		return;
+	}
+	printk("powerd running.\n");
+	if (request_irq(edev->irqs[0],
+			power_handler, SA_SHIRQ, "power",
+			(void *) power_reg) < 0)
+		printk("power: Error, cannot register IRQ handler.\n");
+}
+#endif /* CONFIG_PCI */