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/* kernel/power/consoleearlysuspend.c
*
* Copyright (C) 2005-2008 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/console.h>
#include <linux/earlysuspend.h>
#include <linux/kbd_kern.h>
#include <linux/module.h>
#include <linux/vt_kern.h>
#include <linux/wait.h>
#define EARLY_SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
static int orig_fgconsole;
static void console_early_suspend(struct early_suspend *h)
{
acquire_console_sem();
orig_fgconsole = fg_console;
if (vc_allocate(EARLY_SUSPEND_CONSOLE))
goto err;
if (set_console(EARLY_SUSPEND_CONSOLE))
goto err;
release_console_sem();
if (vt_waitactive(EARLY_SUSPEND_CONSOLE))
pr_warning("console_early_suspend: Can't switch VCs.\n");
return;
err:
pr_warning("console_early_suspend: Can't set console\n");
release_console_sem();
}
static void console_late_resume(struct early_suspend *h)
{
int ret;
acquire_console_sem();
ret = set_console(orig_fgconsole);
release_console_sem();
if (ret) {
pr_warning("console_late_resume: Can't set console.\n");
return;
}
if (vt_waitactive(orig_fgconsole))
pr_warning("console_late_resume: Can't switch VCs.\n");
}
static struct early_suspend console_early_suspend_desc = {
.level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
.suspend = console_early_suspend,
.resume = console_late_resume,
};
static ssize_t console_switch_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return 0;
}
#define power_ro_attr(_name) \
static struct kobj_attribute _name##_attr = { \
.attr = { \
.name = __stringify(_name), \
.mode = 0444, \
}, \
.show = _name##_show, \
.store = NULL, \
}
power_ro_attr(console_switch);
static struct attribute *g[] = {
&console_switch_attr.attr,
NULL,
};
static struct attribute_group attr_group = {
.attrs = g,
};
static int __init console_early_suspend_init(void)
{
int ret;
ret = sysfs_create_group(power_kobj, &attr_group);
if (ret) {
pr_err("android_power_init: sysfs_create_group failed\n");
return ret;
}
register_early_suspend(&console_early_suspend_desc);
return 0;
}
static void __exit console_early_suspend_exit(void)
{
unregister_early_suspend(&console_early_suspend_desc);
sysfs_remove_group(power_kobj, &attr_group);
}
module_init(console_early_suspend_init);
module_exit(console_early_suspend_exit);
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