release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/kernel/power.c

   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
  16 static void __iomem *power_reg;
  17
  18 static irqreturn_t power_handler(int irq, void *dev_id)
  19 {
  20         orderly_poweroff(true);
  21
  22         return IRQ_HANDLED;
  23 }
  24
  25 static 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
  35 static 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
  54 static struct of_device_id __initdata power_match[] = {
  55         {
  56                 .name = "power",
  57         },
  58         {},
  59 };
  60
  61 static 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
  70 static int __init power_init(void)
  71 {
  72         return of_register_platform_driver(&power_driver);
  73 }
  74
  75 device_initcall(power_init);