160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/*
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* MPIC timer wakeup driver
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*
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* Copyright 2013 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <asm/mpic_timer.h>
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#include <asm/mpic.h>
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struct fsl_mpic_timer_wakeup {
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struct mpic_timer *timer;
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struct work_struct free_work;
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};
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static struct fsl_mpic_timer_wakeup *fsl_wakeup;
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static DEFINE_MUTEX(sysfs_lock);
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static void fsl_free_resource(struct work_struct *ws)
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{
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struct fsl_mpic_timer_wakeup *wakeup =
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container_of(ws, struct fsl_mpic_timer_wakeup, free_work);
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mutex_lock(&sysfs_lock);
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if (wakeup->timer) {
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disable_irq_wake(wakeup->timer->irq);
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mpic_free_timer(wakeup->timer);
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}
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wakeup->timer = NULL;
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mutex_unlock(&sysfs_lock);
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}
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static irqreturn_t fsl_mpic_timer_irq(int irq, void *dev_id)
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{
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struct fsl_mpic_timer_wakeup *wakeup = dev_id;
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schedule_work(&wakeup->free_work);
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return wakeup->timer ? IRQ_HANDLED : IRQ_NONE;
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}
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static ssize_t fsl_timer_wakeup_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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time64_t interval = 0;
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mutex_lock(&sysfs_lock);
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if (fsl_wakeup->timer) {
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mpic_get_remain_time(fsl_wakeup->timer, &interval);
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interval++;
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}
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mutex_unlock(&sysfs_lock);
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return sprintf(buf, "%lld\n", interval);
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}
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static ssize_t fsl_timer_wakeup_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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time64_t interval;
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int ret;
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if (kstrtoll(buf, 0, &interval))
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return -EINVAL;
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mutex_lock(&sysfs_lock);
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if (fsl_wakeup->timer) {
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disable_irq_wake(fsl_wakeup->timer->irq);
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mpic_free_timer(fsl_wakeup->timer);
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fsl_wakeup->timer = NULL;
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}
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if (!interval) {
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mutex_unlock(&sysfs_lock);
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return count;
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}
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fsl_wakeup->timer = mpic_request_timer(fsl_mpic_timer_irq,
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fsl_wakeup, interval);
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if (!fsl_wakeup->timer) {
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mutex_unlock(&sysfs_lock);
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return -EINVAL;
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}
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ret = enable_irq_wake(fsl_wakeup->timer->irq);
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if (ret) {
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mpic_free_timer(fsl_wakeup->timer);
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fsl_wakeup->timer = NULL;
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mutex_unlock(&sysfs_lock);
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return ret;
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}
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mpic_start_timer(fsl_wakeup->timer);
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mutex_unlock(&sysfs_lock);
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return count;
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}
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static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644,
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fsl_timer_wakeup_show, fsl_timer_wakeup_store);
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static int __init fsl_wakeup_sys_init(void)
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{
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int ret;
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fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL);
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if (!fsl_wakeup)
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return -ENOMEM;
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INIT_WORK(&fsl_wakeup->free_work, fsl_free_resource);
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ret = device_create_file(mpic_subsys.dev_root, &mpic_attributes);
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if (ret)
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kfree(fsl_wakeup);
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return ret;
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}
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static void __exit fsl_wakeup_sys_exit(void)
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{
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device_remove_file(mpic_subsys.dev_root, &mpic_attributes);
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mutex_lock(&sysfs_lock);
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if (fsl_wakeup->timer) {
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disable_irq_wake(fsl_wakeup->timer->irq);
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mpic_free_timer(fsl_wakeup->timer);
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}
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kfree(fsl_wakeup);
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mutex_unlock(&sysfs_lock);
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}
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module_init(fsl_wakeup_sys_init);
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module_exit(fsl_wakeup_sys_exit);
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MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
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