| /* power.c: Power management driver. |
| * |
| * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net) |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/reboot.h> |
| #include <linux/of_device.h> |
| |
| #include <asm/prom.h> |
| #include <asm/io.h> |
| |
| static void __iomem *power_reg; |
| |
| static irqreturn_t power_handler(int irq, void *dev_id) |
| { |
| orderly_poweroff(true); |
| |
| /* FIXME: Check registers for status... */ |
| return IRQ_HANDLED; |
| } |
| |
| static int __devinit has_button_interrupt(unsigned int irq, struct device_node *dp) |
| { |
| if (irq == 0xffffffff) |
| return 0; |
| if (!of_find_property(dp, "button", NULL)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int __devinit power_probe(struct platform_device *op) |
| { |
| struct resource *res = &op->resource[0]; |
| unsigned int irq = op->archdata.irqs[0]; |
| |
| power_reg = of_ioremap(res, 0, 0x4, "power"); |
| |
| printk(KERN_INFO "%s: Control reg at %llx\n", |
| op->dev.of_node->name, res->start); |
| |
| if (has_button_interrupt(irq, op->dev.of_node)) { |
| if (request_irq(irq, |
| power_handler, 0, "power", NULL) < 0) |
| printk(KERN_ERR "power: Cannot setup IRQ handler.\n"); |
| } |
| |
| return 0; |
| } |
| |
| static struct of_device_id __initdata power_match[] = { |
| { |
| .name = "power", |
| }, |
| {}, |
| }; |
| |
| static struct platform_driver power_driver = { |
| .probe = power_probe, |
| .driver = { |
| .name = "power", |
| .owner = THIS_MODULE, |
| .of_match_table = power_match, |
| }, |
| }; |
| |
| static int __init power_init(void) |
| { |
| return platform_driver_register(&power_driver); |
| } |
| |
| device_initcall(power_init); |