/* power.c: Power management driver. * * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net) */ #include <linux/kernel.h> #include <linux/export.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 const struct of_device_id 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);