LXR linux/arch/sparc/kernel/power.c

   1// SPDX-License-Identifier: GPL-2.0
   2/* power.c: Power management driver.
   3 *
   4 * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
   5 */
   6
   7#include <linux/kernel.h>
   8#include <linux/export.h>
   9#include <linux/init.h>
  10#include <linux/interrupt.h>
  11#include <linux/reboot.h>
  12#include <linux/of_device.h>
  13
  14#include <asm/prom.h>
  15#include <asm/io.h>
  16
  17static void __iomem *power_reg;
  18
  19static irqreturn_t power_handler(int irq, void *dev_id)
  20{
  21        orderly_poweroff(true);
  22
  23        /* FIXME: Check registers for status... */
  24        return IRQ_HANDLED;
  25}
  26
  27static int has_button_interrupt(unsigned int irq, struct device_node *dp)
  28{
  29        if (irq == 0xffffffff)
  30                return 0;
  31        if (!of_find_property(dp, "button", NULL))
  32                return 0;
  33
  34        return 1;
  35}
  36
  37static int power_probe(struct platform_device *op)
  38{
  39        struct resource *res = &op->resource[0];
  40        unsigned int irq = op->archdata.irqs[0];
  41
  42        power_reg = of_ioremap(res, 0, 0x4, "power");
  43
  44        printk(KERN_INFO "%pOFn: Control reg at %llx\n",
  45               op->dev.of_node, res->start);
  46
  47        if (has_button_interrupt(irq, op->dev.of_node)) {
  48                if (request_irq(irq,
  49                                power_handler, 0, "power", NULL) < 0)
  50                        printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
  51        }
  52
  53        return 0;
  54}
  55
  56static const struct of_device_id power_match[] = {
  57        {
  58                .name = "power",
  59        },
  60        {},
  61};
  62
  63static struct platform_driver power_driver = {
  64        .probe          = power_probe,
  65        .driver = {
  66                .name = "power",
  67                .of_match_table = power_match,
  68        },
  69};
  70
  71builtin_platform_driver(power_driver);
  72