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/*
* Copyright (C) 2014 Spreadtrum Communications 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.
*/
#ifndef _SIMPLE_EVENTS_H_
#define _SIMPLE_EVENTS_H_
#include <linux/wait.h>
struct __simple_event {
spinlock_t lock;
wait_queue_head_t wq;
unsigned int flags;
};
typedef struct __simple_event simple_event_t;
static inline void simple_evnet_init(simple_event_t* evt)
{
spin_lock_init(&evt->lock);
init_waitqueue_head(&evt->wq);
evt->flags = 0;
}
static inline int simple_evnet_get(simple_event_t* evt, unsigned int req_flags,
unsigned int *actual_flags)
{
unsigned long flags;
if(!evt) return -1;
*actual_flags = 0;
while(!(*actual_flags)) {
wait_event(evt->wq, (evt->flags & req_flags));
spin_lock_irqsave(&evt->lock, flags);
*actual_flags = evt->flags & req_flags;
evt->flags &= ~req_flags;
spin_unlock_irqrestore(&evt->lock, flags);
}
return 0;
}
static inline int simple_evnet_set(simple_event_t* evt, unsigned int flags,
int opt_and)
{
unsigned long irq_flags;
int need_wake = 0;
if(!evt) return -1;
spin_lock_irqsave(&evt->lock, irq_flags);
if(!opt_and) {
evt->flags |= flags;
} else {
evt->flags &= flags;
}
if(evt->flags) {
need_wake = 1;
}
spin_unlock_irqrestore(&evt->lock, irq_flags);
if(need_wake) {
wake_up(&evt->wq);
}
return 0;
}
#endif /* !_SIMPLE_EVENTS_H_ */
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