1 /* 2 * Interface for power-management for ppc64 compliant platform 3 * 4 * Manish Ahuja <mahuja@us.ibm.com> 5 * 6 * Feb 2007 7 * 8 * Copyright (C) 2007 IBM Corporation. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; version 2 of the License. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 */ 23 24 #include <linux/kobject.h> 25 #include <linux/string.h> 26 #include <linux/errno.h> 27 #include <linux/init.h> 28 #include <asm/machdep.h> 29 30 unsigned long rtas_poweron_auto; /* default and normal state is 0 */ 31 32 static ssize_t auto_poweron_show(struct kobject *kobj, 33 struct kobj_attribute *attr, char *buf) 34 { 35 return sprintf(buf, "%lu\n", rtas_poweron_auto); 36 } 37 38 static ssize_t auto_poweron_store(struct kobject *kobj, 39 struct kobj_attribute *attr, 40 const char *buf, size_t n) 41 { 42 int ret; 43 unsigned long ups_restart; 44 ret = sscanf(buf, "%lu", &ups_restart); 45 46 if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){ 47 rtas_poweron_auto = ups_restart; 48 return n; 49 } 50 return -EINVAL; 51 } 52 53 static struct kobj_attribute auto_poweron_attr = 54 __ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store); 55 56 #ifndef CONFIG_PM 57 struct kobject *power_kobj; 58 59 static struct attribute *g[] = { 60 &auto_poweron_attr.attr, 61 NULL, 62 }; 63 64 static struct attribute_group attr_group = { 65 .attrs = g, 66 }; 67 68 static int __init pm_init(void) 69 { 70 power_kobj = kobject_create_and_add("power", NULL); 71 if (!power_kobj) 72 return -ENOMEM; 73 return sysfs_create_group(power_kobj, &attr_group); 74 } 75 machine_core_initcall(pseries, pm_init); 76 #else 77 static int __init apo_pm_init(void) 78 { 79 return (sysfs_create_file(power_kobj, &auto_poweron_attr.attr)); 80 } 81 machine_device_initcall(pseries, apo_pm_init); 82 #endif 83