5d30bf3097
During power outages, the UPS notifies the system for a shutdown. In the current setup, it isn't possible to poweron when power is restored. This patch fixes the issue by calling the right ibm,power-off-ups token during such events. It also adds a sysfs interface so userspace can specify whether or not to power on when power is restored. Signed-off-by: Manish Ahuja <ahuja@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
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* Interface for power-management for ppc64 compliant platform
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*
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* Manish Ahuja <mahuja@us.ibm.com>
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*
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* Feb 2007
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*
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* Copyright (C) 2007 IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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unsigned long rtas_poweron_auto; /* default and normal state is 0 */
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static ssize_t auto_poweron_show(struct subsystem *subsys, char *buf)
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{
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return sprintf(buf, "%lu\n", rtas_poweron_auto);
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}
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static ssize_t
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auto_poweron_store(struct subsystem *subsys, const char *buf, size_t n)
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{
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int ret;
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unsigned long ups_restart;
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ret = sscanf(buf, "%lu", &ups_restart);
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if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
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rtas_poweron_auto = ups_restart;
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return n;
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}
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return -EINVAL;
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}
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static struct subsys_attribute auto_poweron_attr = {
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.attr = {
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.name = __stringify(auto_poweron),
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.mode = 0644,
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},
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.show = auto_poweron_show,
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.store = auto_poweron_store,
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};
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#ifndef CONFIG_PM
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decl_subsys(power,NULL,NULL);
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static struct attribute *g[] = {
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&auto_poweron_attr.attr,
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NULL,
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};
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static struct attribute_group attr_group = {
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.attrs = g,
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};
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static int __init pm_init(void)
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{
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int error = subsystem_register(&power_subsys);
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if (!error)
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error = sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
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return error;
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}
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core_initcall(pm_init);
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#else
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extern struct subsystem power_subsys;
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static int __init apo_pm_init(void)
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{
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return (subsys_create_file(&power_subsys, &auto_poweron_attr));
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}
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__initcall(apo_pm_init);
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#endif
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