linux-imx

/*

 * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>

 *

 * 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.

 */

​

#include <linux/spinlock.h>

#include <linux/list.h>

#include <linux/sched/signal.h>

#include <linux/delay.h>

#include <linux/export.h>

​

#include "w1_internal.h"

​

DEFINE_SPINLOCK(w1_flock);

static LIST_HEAD(w1_families);

​

/**

 * w1_register_family() - register a device family driver

 * @newf:   family to register

 */

int w1_register_family(struct w1_family *newf)

{

    struct list_head *ent, *n;

    struct w1_family *f;

    int ret = 0;

​

    spin_lock(&w1_flock);

    list_for_each_safe(ent, n, &w1_families) {

        f = list_entry(ent, struct w1_family, family_entry);

​

        if (f->fid == newf->fid) {

            ret = -EEXIST;

            break;

        }

    }

​

    if (!ret) {

        atomic_set(&newf->refcnt, 0);

        list_add_tail(&newf->family_entry, &w1_families);

    }

    spin_unlock(&w1_flock);

​

    /* check default devices against the new set of drivers */

    w1_reconnect_slaves(newf, 1);

​

    return ret;

}

EXPORT_SYMBOL(w1_register_family);

​

/**

 * w1_unregister_family() - unregister a device family driver

 * @fent:   family to unregister

 */

void w1_unregister_family(struct w1_family *fent)