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/*
* MPIC timer wakeup driver
*
* Copyright 2013 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.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <asm/mpic_timer.h>
#include <asm/mpic.h>
struct fsl_mpic_timer_wakeup {
struct mpic_timer *timer;
struct work_struct free_work;
};
static struct fsl_mpic_timer_wakeup *fsl_wakeup;
static DEFINE_MUTEX(sysfs_lock);
static void fsl_free_resource(struct work_struct *ws)
{
struct fsl_mpic_timer_wakeup *wakeup =
container_of(ws, struct fsl_mpic_timer_wakeup, free_work);
mutex_lock(&sysfs_lock);
if (wakeup->timer) {
disable_irq_wake(wakeup->timer->irq);
mpic_free_timer(wakeup->timer);
}
wakeup->timer = NULL;
mutex_unlock(&sysfs_lock);
}
static irqreturn_t fsl_mpic_timer_irq(int irq, void *dev_id)
{
struct fsl_mpic_timer_wakeup *wakeup = dev_id;
schedule_work(&wakeup->free_work);
return wakeup->timer ? IRQ_HANDLED : IRQ_NONE;
}
static ssize_t fsl_timer_wakeup_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
time64_t interval = 0;
mutex_lock(&sysfs_lock);
if (fsl_wakeup->timer) {
mpic_get_remain_time(fsl_wakeup->timer, &interval);
interval++;
}
mutex_unlock(&sysfs_lock);
return sprintf(buf, "%lld\n", interval);
}
static ssize_t fsl_timer_wakeup_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
time64_t interval;
int ret;
if (kstrtoll(buf, 0, &interval))
return -EINVAL;
mutex_lock(&sysfs_lock);
if (fsl_wakeup->timer) {
disable_irq_wake(fsl_wakeup->timer->irq);
mpic_free_timer(fsl_wakeup->timer);
fsl_wakeup->timer = NULL;
}
if (!interval) {
mutex_unlock(&sysfs_lock);
return count;
}
fsl_wakeup->timer = mpic_request_timer(fsl_mpic_timer_irq,
fsl_wakeup, interval);
if (!fsl_wakeup->timer) {
mutex_unlock(&sysfs_lock);
return -EINVAL;
}
ret = enable_irq_wake(fsl_wakeup->timer->irq);
if (ret) {
mpic_free_timer(fsl_wakeup->timer);
fsl_wakeup->timer = NULL;
mutex_unlock(&sysfs_lock);
return ret;
}
mpic_start_timer(fsl_wakeup->timer);
mutex_unlock(&sysfs_lock);
return count;
}
static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644,
fsl_timer_wakeup_show, fsl_timer_wakeup_store);
static int __init fsl_wakeup_sys_init(void)
{
int ret;
fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL);
if (!fsl_wakeup)
return -ENOMEM;
INIT_WORK(&fsl_wakeup->free_work, fsl_free_resource);
ret = device_create_file(mpic_subsys.dev_root, &mpic_attributes);
if (ret)
kfree(fsl_wakeup);
return ret;
}
static void __exit fsl_wakeup_sys_exit(void)
{
device_remove_file(mpic_subsys.dev_root, &mpic_attributes);
mutex_lock(&sysfs_lock);
if (fsl_wakeup->timer) {
disable_irq_wake(fsl_wakeup->timer->irq);
mpic_free_timer(fsl_wakeup->timer);
}
kfree(fsl_wakeup);
mutex_unlock(&sysfs_lock);
}
module_init(fsl_wakeup_sys_init);
module_exit(fsl_wakeup_sys_exit);
MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
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