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/* /linux/drivers/misc/modem_if/modem_net_flowcontrol_device.c
*
* Copyright (C) 2011 Google, Inc.
* Copyright (C) 2011 Samsung Electronics.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/sched.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/platform_data/modem_na.h>
#include "modem_prj.h"
#define NET_FLOWCONTROL_DEV_NAME_LEN 8
static int modem_net_flowcontrol_device_open(
struct inode *inode, struct file *filp)
{
return 0;
}
static int modem_net_flowcontrol_device_release(
struct inode *inode, struct file *filp)
{
return 0;
}
static long modem_net_flowcontrol_device_ioctl(
struct file *filp, unsigned int cmd, unsigned long arg)
{
struct net *this_net;
struct net_device *ndev;
char dev_name[NET_FLOWCONTROL_DEV_NAME_LEN];
u8 chan;
if (copy_from_user(&chan, (void __user *)arg, sizeof(char)))
return -EFAULT;
if (chan > 15)
return -ENODEV;
snprintf(dev_name, NET_FLOWCONTROL_DEV_NAME_LEN, "rmnet%d", (int)chan);
this_net = get_net_ns_by_pid(current->pid);
ndev = __dev_get_by_name(this_net, dev_name);
if (ndev == NULL) {
pr_err("[MODEM_IF] %s: device = %s not exist\n", __func__,
dev_name);
return -ENODEV;
}
switch (cmd) {
case IOCTL_MODEM_NET_SUSPEND:
netif_stop_queue(ndev);
pr_info("[MODEM_IF] NET SUSPEND(%s)\n", dev_name);
break;
case IOCTL_MODEM_NET_RESUME:
netif_wake_queue(ndev);
pr_info("[MODEM_IF] NET RESUME(%s)\n", dev_name);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct file_operations modem_net_flowcontrol_device_fops = {
.owner = THIS_MODULE,
.open = modem_net_flowcontrol_device_open,
.release = modem_net_flowcontrol_device_release,
.unlocked_ioctl = modem_net_flowcontrol_device_ioctl,
};
static int __init modem_net_flowcontrol_device_init(void)
{
int ret = 0;
struct io_device *net_flowcontrol_dev;
net_flowcontrol_dev = kzalloc(sizeof(struct io_device), GFP_KERNEL);
if (!net_flowcontrol_dev) {
pr_err("[MODEM_IF] net_flowcontrol_dev io device memory alloc fail\n");
return -ENOMEM;
}
net_flowcontrol_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
net_flowcontrol_dev->miscdev.name = "modem_br";
net_flowcontrol_dev->miscdev.fops = &modem_net_flowcontrol_device_fops;
ret = misc_register(&net_flowcontrol_dev->miscdev);
if (ret)
pr_err("[MODEM_IF] failed to register misc br device : %s\n",
net_flowcontrol_dev->miscdev.name);
return ret;
}
module_init(modem_net_flowcontrol_device_init);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Samsung Modem IF Net Flowcontrol Driver");
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