2007-07-11 19:18:04 -06:00
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/* power.c: Power management driver.
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2005-04-16 16:20:36 -06:00
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*
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2008-08-30 02:18:56 -06:00
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* Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
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2005-04-16 16:20:36 -06:00
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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2007-07-18 14:12:45 -06:00
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#include <linux/reboot.h>
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2008-08-07 16:33:36 -06:00
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#include <linux/of_device.h>
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2005-04-16 16:20:36 -06:00
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2006-06-29 16:22:46 -06:00
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#include <asm/prom.h>
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#include <asm/io.h>
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2005-04-16 16:20:36 -06:00
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static void __iomem *power_reg;
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2007-07-11 19:18:04 -06:00
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static irqreturn_t power_handler(int irq, void *dev_id)
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{
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2007-07-18 14:12:45 -06:00
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orderly_poweroff(true);
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2005-04-16 16:20:36 -06:00
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/* FIXME: Check registers for status... */
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return IRQ_HANDLED;
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}
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2009-04-07 01:47:44 -06:00
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static int __devinit has_button_interrupt(unsigned int irq, struct device_node *dp)
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2005-04-16 16:20:36 -06:00
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{
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2007-07-11 19:18:04 -06:00
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if (irq == 0xffffffff)
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2005-04-16 16:20:36 -06:00
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return 0;
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2006-06-22 20:12:03 -06:00
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if (!of_find_property(dp, "button", NULL))
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2005-04-16 16:20:36 -06:00
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return 0;
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return 1;
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}
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2006-06-29 16:22:46 -06:00
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static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
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2005-04-16 16:20:36 -06:00
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{
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2006-06-29 16:22:46 -06:00
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struct resource *res = &op->resource[0];
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unsigned int irq= op->irqs[0];
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2006-06-23 02:44:10 -06:00
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2006-06-29 16:22:46 -06:00
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power_reg = of_ioremap(res, 0, 0x4, "power");
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2009-01-06 14:19:28 -07:00
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printk(KERN_INFO "%s: Control reg at %llx\n",
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2006-06-29 16:22:46 -06:00
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op->node->name, res->start);
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2006-06-23 02:44:10 -06:00
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2006-06-29 16:22:46 -06:00
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if (has_button_interrupt(irq, op->node)) {
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2005-10-06 21:43:54 -06:00
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if (request_irq(irq,
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2006-06-29 15:39:11 -06:00
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power_handler, 0, "power", NULL) < 0)
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2007-07-11 19:18:04 -06:00
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printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
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2005-04-16 16:20:36 -06:00
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}
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2006-06-29 16:22:46 -06:00
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return 0;
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2005-04-16 16:20:36 -06:00
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}
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2006-06-23 02:44:10 -06:00
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2008-08-31 02:23:17 -06:00
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static struct of_device_id __initdata power_match[] = {
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2006-06-23 02:44:10 -06:00
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{
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.name = "power",
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},
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{},
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};
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2006-06-29 16:22:46 -06:00
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static struct of_platform_driver power_driver = {
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2006-06-23 02:44:10 -06:00
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.match_table = power_match,
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2006-06-29 16:22:46 -06:00
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.probe = power_probe,
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2007-10-11 00:27:34 -06:00
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.driver = {
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.name = "power",
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},
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2006-06-23 02:44:10 -06:00
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};
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2008-08-30 02:18:56 -06:00
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static int __init power_init(void)
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2006-06-23 02:44:10 -06:00
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{
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2008-08-30 02:18:56 -06:00
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return of_register_driver(&power_driver, &of_platform_bus_type);
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2006-06-23 02:44:10 -06:00
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}
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2008-08-30 02:18:56 -06:00
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device_initcall(power_init);
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