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/*
* PowerPC 4xx suspend and standby support
*
* (C) Copyright 2009, Applied Micro Circuits Corporation
* Victor Gallardo (vgallardo@amcc.com)
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/kobject.h>
#include <linux/string.h>
#include <asm/ppc4xx_cpm.h>
#define CONFIG_PM_DEBUG
#if defined(CONFIG_PM_DEBUG)
# define PM_DEBUG(fmt, arg...) printk(KERN_DEBUG fmt, ## arg)
#else
# define PM_DEBUG(fmt, arg...) ((void)0)
#endif
static int suspend_mode = CPM_PM_DOZE;
static ssize_t ppc_4xx_suspend_available_modes_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
char *s = buf;
int i;
for (i = 0; i < CPM_PM_MODES_MAX; i++) {
s += sprintf(s, "%s ", cpm_mode_name(i));
}
*(s-1) = '\n'; /* convert the last space to a newline */
return (s - buf);
}
static ssize_t ppc_4xx_suspend_mode_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
char *s = buf;
s += sprintf(s, "%s\n", cpm_mode_name(suspend_mode));
return (s - buf);
}
static ssize_t ppc_4xx_suspend_mode_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t n)
{
int i;
char *p;
int len;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
for (i = 0; i < CPM_PM_MODES_MAX; i++) {
if (strncmp(buf, cpm_mode_name(i), len) == 0) {
suspend_mode = i;
return n;
}
}
return -EINVAL;
}
static struct kobj_attribute ppc_4xx_suspend_available_modes_attr =
__ATTR(suspend_available_modes, 0444,
ppc_4xx_suspend_available_modes_show, NULL);
static struct kobj_attribute ppc_4xx_suspend_mode_attr =
__ATTR(suspend_mode, 0644,
ppc_4xx_suspend_mode_show, ppc_4xx_suspend_mode_store);
static int ppc4xx_suspend_valid(suspend_state_t state)
{
return ((state == PM_SUSPEND_STANDBY) || (state == PM_SUSPEND_MEM));
}
static int ppc4xx_suspend_enter(suspend_state_t state)
{
PM_DEBUG("%s\n", __func__);
switch (state) {
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
cpm_pm_suspend(state, suspend_mode);
return 0;
default:
return -EINVAL;
}
}
static struct platform_suspend_ops ppc4xx_suspend_ops = {
.valid = ppc4xx_suspend_valid,
.enter = ppc4xx_suspend_enter,
};
int __init ppc4xx_suspend_init(void)
{
int err;
suspend_set_ops(&ppc4xx_suspend_ops);
PM_DEBUG("Create sysfs power");
err = sysfs_create_file(power_kobj,
&ppc_4xx_suspend_mode_attr.attr);
err = sysfs_create_file(power_kobj,
&ppc_4xx_suspend_available_modes_attr.attr);
return 0;
}
arch_initcall(ppc4xx_suspend_init);
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