LXR linux/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
  16static void __iomem *power_reg;
  17
  18static irqreturn_t power_handler(int irq, void *dev_id)
  19{
  20        orderly_poweroff(true);
  21
  22        /* FIXME: Check registers for status... */
  23        return IRQ_HANDLED;
  24}
  25
  26static int __devinit has_button_interrupt(unsigned int irq, struct device_node *dp)
  27{
  28        if (irq == 0xffffffff)
  29                return 0;
  30        if (!of_find_property(dp, "button", NULL))
  31                return 0;
  32
  33        return 1;
  34}
  35
  36static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
  37{
  38        struct resource *res = &op->resource[0];
  39        unsigned int irq= op->irqs[0];
  40
  41        power_reg = of_ioremap(res, 0, 0x4, "power");
  42
  43        printk(KERN_INFO "%s: Control reg at %llx\n",
  44               op->node->name, res->start);
  45
  46        if (has_button_interrupt(irq, op->node)) {
  47                if (request_irq(irq,
  48                                power_handler, 0, "power", NULL) < 0)
  49                        printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
  50        }
  51
  52        return 0;
  53}
  54
  55static struct of_device_id __initdata power_match[] = {
  56        {
  57                .name = "power",
  58        },
  59        {},
  60};
  61
  62static struct of_platform_driver power_driver = {
  63        .match_table    = power_match,
  64        .probe          = power_probe,
  65        .driver         = {
  66                .name   = "power",
  67        },
  68};
  69
  70static int __init power_init(void)
  71{
  72        return of_register_driver(&power_driver, &of_platform_bus_type);
  73}
  74
  75device_initcall(power_init);
  76