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13077d80 1/* power.c: Power management driver.
1da177e4 2 *
c510b9bf 3 * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
1da177e4
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4 */
5
1da177e4
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6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/init.h>
1da177e4 9#include <linux/interrupt.h>
a3761780 10#include <linux/reboot.h>
764f2579 11#include <linux/of_device.h>
1da177e4 12
abbce6e2 13#include <asm/prom.h>
abbce6e2 14#include <asm/io.h>
1da177e4 15
1da177e4
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16static void __iomem *power_reg;
17
13077d80
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18static irqreturn_t power_handler(int irq, void *dev_id)
19{
a3761780 20 orderly_poweroff(true);
1da177e4
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21
22 /* FIXME: Check registers for status... */
23 return IRQ_HANDLED;
24}
1da177e4 25
19ab6db6 26static int __devinit has_button_interrupt(unsigned int irq, struct device_node *dp)
1da177e4 27{
13077d80 28 if (irq == 0xffffffff)
1da177e4 29 return 0;
690c8fd3 30 if (!of_find_property(dp, "button", NULL))
1da177e4
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31 return 0;
32
33 return 1;
34}
35
4ebb24f7 36static int __devinit power_probe(struct platform_device *op)
1da177e4 37{
abbce6e2 38 struct resource *res = &op->resource[0];
1636f8ac 39 unsigned int irq = op->archdata.irqs[0];
a2bd4fd1 40
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41 power_reg = of_ioremap(res, 0, 0x4, "power");
42
90181136 43 printk(KERN_INFO "%s: Control reg at %llx\n",
61c7a080 44 op->dev.of_node->name, res->start);
a2bd4fd1 45
61c7a080 46 if (has_button_interrupt(irq, op->dev.of_node)) {
2256c13b 47 if (request_irq(irq,
00cde674 48 power_handler, 0, "power", NULL) < 0)
13077d80 49 printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
1da177e4 50 }
abbce6e2
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51
52 return 0;
1da177e4 53}
a2bd4fd1 54
3628aa06 55static const struct of_device_id power_match[] = {
a2bd4fd1
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56 {
57 .name = "power",
58 },
59 {},
60};
61
4ebb24f7 62static struct platform_driver power_driver = {
abbce6e2 63 .probe = power_probe,
4018294b
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64 .driver = {
65 .name = "power",
66 .owner = THIS_MODULE,
67 .of_match_table = power_match,
a2cd1558 68 },
a2bd4fd1
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69};
70
c510b9bf 71static int __init power_init(void)
a2bd4fd1 72{
4ebb24f7 73 return platform_driver_register(&power_driver);
a2bd4fd1 74}
c510b9bf
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75
76device_initcall(power_init);