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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/export.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         /* FIXME: Check registers for status... */
 23         return IRQ_HANDLED;
 24 }
 25 
 26 static int 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 
 36 static int power_probe(struct platform_device *op)
 37 {
 38         struct resource *res = &op->resource[0];
 39         unsigned int irq = op->archdata.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->dev.of_node->name, res->start);
 45 
 46         if (has_button_interrupt(irq, op->dev.of_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 
 55 static const struct of_device_id power_match[] = {
 56         {
 57                 .name = "power",
 58         },
 59         {},
 60 };
 61 
 62 static struct platform_driver power_driver = {
 63         .probe          = power_probe,
 64         .driver = {
 65                 .name = "power",
 66                 .owner = THIS_MODULE,
 67                 .of_match_table = power_match,
 68         },
 69 };
 70 
 71 static int __init power_init(void)
 72 {
 73         return platform_driver_register(&power_driver);
 74 }
 75 
 76 device_initcall(power_init);
 77 

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