mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/* power.c: Power management driver.
|
|
*
|
|
* Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/of_device.h>
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/io.h>
|
|
|
|
static void __iomem *power_reg;
|
|
|
|
static irqreturn_t power_handler(int irq, void *dev_id)
|
|
{
|
|
orderly_poweroff(true);
|
|
|
|
/* FIXME: Check registers for status... */
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int __devinit has_button_interrupt(unsigned int irq, struct device_node *dp)
|
|
{
|
|
if (irq == 0xffffffff)
|
|
return 0;
|
|
if (!of_find_property(dp, "button", NULL))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
|
|
{
|
|
struct resource *res = &op->resource[0];
|
|
unsigned int irq= op->irqs[0];
|
|
|
|
power_reg = of_ioremap(res, 0, 0x4, "power");
|
|
|
|
printk(KERN_INFO "%s: Control reg at %llx\n",
|
|
op->node->name, res->start);
|
|
|
|
if (has_button_interrupt(irq, op->node)) {
|
|
if (request_irq(irq,
|
|
power_handler, 0, "power", NULL) < 0)
|
|
printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id __initdata power_match[] = {
|
|
{
|
|
.name = "power",
|
|
},
|
|
{},
|
|
};
|
|
|
|
static struct of_platform_driver power_driver = {
|
|
.match_table = power_match,
|
|
.probe = power_probe,
|
|
.driver = {
|
|
.name = "power",
|
|
},
|
|
};
|
|
|
|
static int __init power_init(void)
|
|
{
|
|
return of_register_driver(&power_driver, &of_platform_bus_type);
|
|
}
|
|
|
|
device_initcall(power_init);
|