Merge branch 'linus' into core/urgent
[linux-2.6] / 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         /* FIXME: Check registers for status... */
23         return IRQ_HANDLED;
24 }
25
26 static int __init 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 __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 %lx\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
55 static struct of_device_id __initdata power_match[] = {
56         {
57                 .name = "power",
58         },
59         {},
60 };
61
62 static struct of_platform_driver power_driver = {
63         .match_table    = power_match,
64         .probe          = power_probe,
65         .driver         = {
66                 .name   = "power",
67         },
68 };
69
70 static int __init power_init(void)
71 {
72         return of_register_driver(&power_driver, &of_platform_bus_type);
73 }
74
75 device_initcall(power_init);