mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
1.4 KiB
71 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* power.c: Power management driver. |
|
* |
|
* Copyright (C) 1999, 2007, 2008 David S. Miller ([email protected]) |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/export.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 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 power_probe(struct platform_device *op) |
|
{ |
|
struct resource *res = &op->resource[0]; |
|
unsigned int irq = op->archdata.irqs[0]; |
|
|
|
power_reg = of_ioremap(res, 0, 0x4, "power"); |
|
|
|
printk(KERN_INFO "%pOFn: Control reg at %llx\n", |
|
op->dev.of_node, res->start); |
|
|
|
if (has_button_interrupt(irq, op->dev.of_node)) { |
|
if (request_irq(irq, |
|
power_handler, 0, "power", NULL) < 0) |
|
printk(KERN_ERR "power: Cannot setup IRQ handler.\n"); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id power_match[] = { |
|
{ |
|
.name = "power", |
|
}, |
|
{}, |
|
}; |
|
|
|
static struct platform_driver power_driver = { |
|
.probe = power_probe, |
|
.driver = { |
|
.name = "power", |
|
.of_match_table = power_match, |
|
}, |
|
}; |
|
|
|
builtin_platform_driver(power_driver);
|
|
|