1 /* power.c: Power management driver.
3 * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/interrupt.h>
10 #include <linux/reboot.h>
11 #include <linux/of_device.h>
16 static void __iomem *power_reg;
18 static irqreturn_t power_handler(int irq, void *dev_id)
20 orderly_poweroff(true);
22 /* FIXME: Check registers for status... */
26 static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
28 if (irq == 0xffffffff)
30 if (!of_find_property(dp, "button", NULL))
36 static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
38 struct resource *res = &op->resource[0];
39 unsigned int irq= op->irqs[0];
41 power_reg = of_ioremap(res, 0, 0x4, "power");
43 printk(KERN_INFO "%s: Control reg at %llx\n",
44 op->node->name, res->start);
46 if (has_button_interrupt(irq, op->node)) {
48 power_handler, 0, "power", NULL) < 0)
49 printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
55 static struct of_device_id __initdata power_match[] = {
62 static struct of_platform_driver power_driver = {
63 .match_table = power_match,
70 static int __init power_init(void)
72 return of_register_driver(&power_driver, &of_platform_bus_type);
75 device_initcall(power_init);