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authorManish Ahuja <ahuja@austin.ibm.com>2007-02-08 16:01:17 -0600
committerPaul Mackerras <paulus@samba.org>2007-02-17 10:22:50 +1100
commit5d30bf309717a518d0c4180af41650d4dcd3bb38 (patch)
treed76a078f1b1737092528a4305357bc6384aeb041 /arch/powerpc/platforms/pseries/power.c
parentaebcbf39be0aadded32f4cd82c1d88a8cac4614b (diff)
[POWERPC] pseries: Enabling auto poweron after power is restored.
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>
Diffstat (limited to 'arch/powerpc/platforms/pseries/power.c')
-rw-r--r--arch/powerpc/platforms/pseries/power.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/power.c b/arch/powerpc/platforms/pseries/power.c
new file mode 100644
index 00000000000..2624b71df73
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/power.c
@@ -0,0 +1,87 @@
+/*
+ * Interface for power-management for ppc64 compliant platform
+ *
+ * Manish Ahuja <mahuja@us.ibm.com>
+ *
+ * Feb 2007
+ *
+ * Copyright (C) 2007 IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+
+unsigned long rtas_poweron_auto; /* default and normal state is 0 */
+
+static ssize_t auto_poweron_show(struct subsystem *subsys, char *buf)
+{
+ return sprintf(buf, "%lu\n", rtas_poweron_auto);
+}
+
+static ssize_t
+auto_poweron_store(struct subsystem *subsys, const char *buf, size_t n)
+{
+ int ret;
+ unsigned long ups_restart;
+ ret = sscanf(buf, "%lu", &ups_restart);
+
+ if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
+ rtas_poweron_auto = ups_restart;
+ return n;
+ }
+ return -EINVAL;
+}
+
+static struct subsys_attribute auto_poweron_attr = {
+ .attr = {
+ .name = __stringify(auto_poweron),
+ .mode = 0644,
+ },
+ .show = auto_poweron_show,
+ .store = auto_poweron_store,
+};
+
+#ifndef CONFIG_PM
+decl_subsys(power,NULL,NULL);
+
+static struct attribute *g[] = {
+ &auto_poweron_attr.attr,
+ NULL,
+};
+
+static struct attribute_group attr_group = {
+ .attrs = g,
+};
+
+static int __init pm_init(void)
+{
+ int error = subsystem_register(&power_subsys);
+ if (!error)
+ error = sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
+ return error;
+}
+core_initcall(pm_init);
+#else
+extern struct subsystem power_subsys;
+
+static int __init apo_pm_init(void)
+{
+ return (subsys_create_file(&power_subsys, &auto_poweron_attr));
+}
+__initcall(apo_pm_init);
+#endif