1/* power.c: Power management driver. 2 * 3 * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net) 4 */ 5 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> 12 13#include <asm/prom.h> 14#include <asm/io.h> 15 16static void __iomem *power_reg; 17 18static irqreturn_t power_handler(int irq, void *dev_id) 19{ 20 orderly_poweroff(true); 21 22 return IRQ_HANDLED; 23} 24 25static int __devinit has_button_interrupt(unsigned int irq, struct device_node *dp) 26{ 27 if (irq == 0xffffffff) 28 return 0; 29 if (!of_find_property(dp, "button", NULL)) 30 return 0; 31 32 return 1; 33} 34 35static int __devinit power_probe(struct platform_device *op, const struct of_device_id *match) 36{ 37 struct resource *res = &op->resource[0]; 38 unsigned int irq = op->archdata.irqs[0]; 39 40 power_reg = of_ioremap(res, 0, 0x4, "power"); 41 42 printk(KERN_INFO "%s: Control reg at %llx\n", 43 op->dev.of_node->name, res->start); 44 45 if (has_button_interrupt(irq, op->dev.of_node)) { 46 if (request_irq(irq, 47 power_handler, 0, "power", NULL) < 0) 48 printk(KERN_ERR "power: Cannot setup IRQ handler.\n"); 49 } 50 51 return 0; 52} 53 54static struct of_device_id __initdata power_match[] = { 55 { 56 .name = "power", 57 }, 58 {}, 59}; 60 61static struct of_platform_driver power_driver = { 62 .probe = power_probe, 63 .driver = { 64 .name = "power", 65 .owner = THIS_MODULE, 66 .of_match_table = power_match, 67 }, 68}; 69 70static int __init power_init(void) 71{ 72 return of_register_platform_driver(&power_driver); 73} 74 75device_initcall(power_init); 76