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/*
* Copyright (C) 2011-2012 Freescale Semiconductor, Inc.
*
* 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/earlysuspend.h>
#include <linux/cpu.h>
enum {
DEBUG_USER_STATE = 1U << 0,
DEBUG_SUSPEND = 1U << 2,
DEBUG_VERBOSE = 1U << 3,
};
static int debug_mask = DEBUG_USER_STATE;
module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
static DEFINE_PER_CPU(int, tag);
static struct work_struct cpu_up_work;
static struct workqueue_struct *cpu_op_workqueue;
static void earlysuspend_cpu_op(int cpu, bool status)
{
/* tag the cpu is onling/offline */
if (status) {
per_cpu(tag, cpu) = 0;
cpu_up(cpu);
} else {
per_cpu(tag, cpu) = 1;
cpu_down(cpu);
}
}
static void cpuhotplug_early_suspend(struct early_suspend *p)
{
int first_cpu, cpu;
/* skip the first cpu, cpu0 always online */
first_cpu = cpumask_first(cpu_online_mask);
for_each_possible_cpu(cpu) {
if (cpu == first_cpu)
continue;
if (cpu_online(cpu))
earlysuspend_cpu_op(cpu, false);
}
}
static void cpu_up_work_func(struct work_struct *work)
{
int first_cpu, c;
/* skip the first cpu, cpu0 always online */
first_cpu = cpumask_first(cpu_online_mask);
for_each_possible_cpu(c) {
if (c == first_cpu)
continue;
if (debug_mask & DEBUG_SUSPEND)
pr_info(" %s: CPU%d tag %d\n", __func__, c,
per_cpu(tag, c));
if (!cpu_online(c) && per_cpu(tag, c))
earlysuspend_cpu_op(c, true);
}
}
static void cpuhotplug_late_resume(struct early_suspend *p)
{
if (debug_mask & DEBUG_SUSPEND)
pr_info(" %s: bootup secondary cpus\n", __func__);
queue_work(cpu_op_workqueue, &cpu_up_work);
}
struct early_suspend cpuhotplug_earlysuspend = {
.level = EARLY_SUSPEND_LEVEL_DISABLE_FB,
.suspend = cpuhotplug_early_suspend,
.resume = cpuhotplug_late_resume,
};
static int __init cpuhotplug_earlysuspend_init(void)
{
cpu_op_workqueue = create_workqueue("cpu hotplug earlysuspend wq");
INIT_WORK(&cpu_up_work, cpu_up_work_func);
register_early_suspend(&cpuhotplug_earlysuspend);
return 0;
}
static void __exit cpuhotplug_earlysuspend_exit(void)
{
if (NULL != cpu_op_workqueue)
destroy_workqueue(cpu_op_workqueue);
unregister_early_suspend(&cpuhotplug_earlysuspend);
}
module_init(cpuhotplug_earlysuspend_init);
module_exit(cpuhotplug_earlysuspend_exit);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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