LXR linux/arch/powerpc/platforms/pseries/power.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Interface for power-management for ppc64 compliant platform
   4 *
   5 *  Manish Ahuja <mahuja@us.ibm.com>
   6 *
   7 *  Feb 2007
   8 *
   9 *  Copyright (C) 2007 IBM Corporation.
  10 */
  11
  12#include <linux/kobject.h>
  13#include <linux/string.h>
  14#include <linux/errno.h>
  15#include <linux/init.h>
  16#include <asm/machdep.h>
  17
  18#include "pseries.h"
  19
  20unsigned long rtas_poweron_auto; /* default and normal state is 0 */
  21
  22static ssize_t auto_poweron_show(struct kobject *kobj,
  23                                 struct kobj_attribute *attr, char *buf)
  24{
  25        return sprintf(buf, "%lu\n", rtas_poweron_auto);
  26}
  27
  28static ssize_t auto_poweron_store(struct kobject *kobj,
  29                                  struct kobj_attribute *attr,
  30                                  const char *buf, size_t n)
  31{
  32        int ret;
  33        unsigned long ups_restart;
  34        ret = sscanf(buf, "%lu", &ups_restart);
  35
  36        if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
  37                rtas_poweron_auto = ups_restart;
  38                return n;
  39        }
  40        return -EINVAL;
  41}
  42
  43static struct kobj_attribute auto_poweron_attr =
  44        __ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
  45
  46#ifndef CONFIG_PM
  47struct kobject *power_kobj;
  48
  49static struct attribute *g[] = {
  50        &auto_poweron_attr.attr,
  51        NULL,
  52};
  53
  54static struct attribute_group attr_group = {
  55        .attrs = g,
  56};
  57
  58static int __init pm_init(void)
  59{
  60        power_kobj = kobject_create_and_add("power", NULL);
  61        if (!power_kobj)
  62                return -ENOMEM;
  63        return sysfs_create_group(power_kobj, &attr_group);
  64}
  65machine_core_initcall(pseries, pm_init);
  66#else
  67static int __init apo_pm_init(void)
  68{
  69        return (sysfs_create_file(power_kobj, &auto_poweron_attr.attr));
  70}
  71machine_device_initcall(pseries, apo_pm_init);
  72#endif
  73