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/* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Code Aurora Forum nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* Alternatively, provided that this notice is retained in full, this software
* may be relicensed by the recipient under the terms of the GNU General Public
* License version 2 ("GPL") and only version 2, in which case the provisions of
* the GPL apply INSTEAD OF those given above. If the recipient relicenses the
* software under the GPL, then the identification text in the MODULE_LICENSE
* macro must be changed to reflect "GPLv2" instead of "Dual BSD/GPL". Once a
* recipient changes the license terms to the GPL, subsequent recipients shall
* not relicense under alternate licensing terms, including the BSD or dual
* BSD/GPL terms. In addition, the following license statement immediately
* below and between the words START and END shall also then apply when this
* software is relicensed under the GPL:
*
* START
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 and only version 2 as
* published by the Free Software Foundation.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* END
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* Modem Restart Notifier -- Provides notification
* of modem restart events.
*/
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include "modem_notifier.h"
#define DEBUG
static struct srcu_notifier_head modem_notifier_list;
static struct workqueue_struct *modem_notifier_wq;
static void notify_work_start_reset(struct work_struct *work)
{
modem_notify(0, MODEM_NOTIFIER_START_RESET);
}
static DECLARE_WORK(modem_notifier_start_reset_work, ¬ify_work_start_reset);
void modem_queue_start_reset_notify(void)
{
int ret;
ret = queue_work(modem_notifier_wq, &modem_notifier_start_reset_work);
if (!ret)
printk(KERN_ERR "%s\n", __func__);
}
EXPORT_SYMBOL(modem_queue_start_reset_notify);
static void notify_work_end_reset(struct work_struct *work)
{
modem_notify(0, MODEM_NOTIFIER_END_RESET);
}
static DECLARE_WORK(modem_notifier_end_reset_work, ¬ify_work_end_reset);
void modem_queue_end_reset_notify(void)
{
int ret;
ret = queue_work(modem_notifier_wq, &modem_notifier_end_reset_work);
if (!ret)
printk(KERN_ERR "%s\n", __func__);
}
EXPORT_SYMBOL(modem_queue_end_reset_notify);
int modem_register_notifier(struct notifier_block *nb)
{
int ret;
ret = srcu_notifier_chain_register(
&modem_notifier_list, nb);
return ret;
}
EXPORT_SYMBOL(modem_register_notifier);
int modem_unregister_notifier(struct notifier_block *nb)
{
int ret;
ret = srcu_notifier_chain_unregister(
&modem_notifier_list, nb);
return ret;
}
EXPORT_SYMBOL(modem_unregister_notifier);
void modem_notify(void *data, unsigned int state)
{
srcu_notifier_call_chain(&modem_notifier_list, state, data);
}
EXPORT_SYMBOL(modem_notify);
#if defined(CONFIG_DEBUG_FS)
static int debug_reset_start(const char __user *buf, int count)
{
modem_queue_start_reset_notify();
return 0;
}
static int debug_reset_end(const char __user *buf, int count)
{
modem_queue_end_reset_notify();
return 0;
}
static ssize_t debug_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
int (*fling)(const char __user *buf, int max) = file->private_data;
fling(buf, count);
return count;
}
static int debug_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static const struct file_operations debug_ops = {
.write = debug_write,
.open = debug_open,
};
static void debug_create(const char *name, mode_t mode,
struct dentry *dent,
int (*fling)(const char __user *buf, int max))
{
debugfs_create_file(name, mode, dent, fling, &debug_ops);
}
static void modem_notifier_debugfs_init(void)
{
struct dentry *dent;
dent = debugfs_create_dir("modem_notifier", 0);
if (IS_ERR(dent))
return;
debug_create("reset_start", 0444, dent, debug_reset_start);
debug_create("reset_end", 0444, dent, debug_reset_end);
}
#else
static void modem_notifier_debugfs_init(void) {}
#endif
#if defined(DEBUG)
static int modem_notifier_test_call(struct notifier_block *this,
unsigned long code,
void *_cmd)
{
switch (code) {
case MODEM_NOTIFIER_START_RESET:
printk(KERN_ERR "Notify: start reset\n");
break;
case MODEM_NOTIFIER_END_RESET:
printk(KERN_ERR "Notify: end reset\n");
break;
default:
printk(KERN_ERR "Notify: general\n");
break;
}
return NOTIFY_DONE;
}
static struct notifier_block nb = {
.notifier_call = modem_notifier_test_call,
};
static void register_test_notifier(void)
{
modem_register_notifier(&nb);
}
#endif
static int __init init_modem_notifier_list(void)
{
srcu_init_notifier_head(&modem_notifier_list);
modem_notifier_debugfs_init();
#if defined(DEBUG)
register_test_notifier();
#endif
/* Create the workqueue */
modem_notifier_wq = create_singlethread_workqueue("modem_notifier");
if (!modem_notifier_wq) {
srcu_cleanup_notifier_head(&modem_notifier_list);
return -ENOMEM;
}
return 0;
}
module_init(init_modem_notifier_list);
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