linux-imx

/*

 * PPS core file

 *

 *

 * Copyright (C) 2005-2009   Rodolfo Giometti <giometti@linux.it>

 *

 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/sched.h>

#include <linux/uaccess.h>

#include <linux/idr.h>

#include <linux/mutex.h>

#include <linux/cdev.h>

#include <linux/poll.h>

#include <linux/pps_kernel.h>

#include <linux/slab.h>

​

#include "kc.h"

​

/*

 * Local variables

 */

​

static dev_t pps_devt;

static struct class *pps_class;

​

static DEFINE_MUTEX(pps_idr_lock);

static DEFINE_IDR(pps_idr);

​

/*

 * Char device methods

 */

​

static __poll_t pps_cdev_poll(struct file *file, poll_table *wait)

{

    struct pps_device *pps = file->private_data;

​

    poll_wait(file, &pps->queue, wait);

​

    return EPOLLIN | EPOLLRDNORM;

}

​

static int pps_cdev_fasync(int fd, struct file *file, int on)

{

    struct pps_device *pps = file->private_data;