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/* Copyright (c) 2008-2010, 2012, The Linux Foundation. All rights reserved.
*
* 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.
*
*/
/*
* 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_smsm_init(struct work_struct *work)
{
modem_notify(0, MODEM_NOTIFIER_SMSM_INIT);
}
static DECLARE_WORK(modem_notifier_smsm_init_work, ¬ify_work_smsm_init);
void modem_queue_smsm_init_notify(void)
{
int ret;
ret = queue_work(modem_notifier_wq, &modem_notifier_smsm_init_work);
if (!ret)
printk(KERN_ERR "%s\n", __func__);
}
EXPORT_SYMBOL(modem_queue_smsm_init_notify);
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;
case MODEM_NOTIFIER_SMSM_INIT:
printk(KERN_ERR "Notify: smsm init\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
int __init msm_init_modem_notifier_list(void)
{
static bool registered;
if (registered)
return 0;
registered = true;
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(msm_init_modem_notifier_list);
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