linux/drivers/net/wwan/wwan_hwsim.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * WWAN device simulator for WWAN framework testing.
 *
 * Copyright (c) 2021, Sergey Ryazanov <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/wwan.h>
#include <linux/debugfs.h>
#include <linux/workqueue.h>

#include <net/arp.h>

static int wwan_hwsim_devsnum = …;
module_param_named(devices, wwan_hwsim_devsnum, int, 0444);
MODULE_PARM_DESC(…) …;

static const struct class wwan_hwsim_class = …;

static struct dentry *wwan_hwsim_debugfs_topdir;
static struct dentry *wwan_hwsim_debugfs_devcreate;

static DEFINE_SPINLOCK(wwan_hwsim_devs_lock);
static LIST_HEAD(wwan_hwsim_devs);
static unsigned int wwan_hwsim_dev_idx;
static struct workqueue_struct *wwan_wq;

struct wwan_hwsim_dev { … };

struct wwan_hwsim_port { … };

static const struct file_operations wwan_hwsim_debugfs_portdestroy_fops;
static const struct file_operations wwan_hwsim_debugfs_portcreate_fops;
static const struct file_operations wwan_hwsim_debugfs_devdestroy_fops;
static void wwan_hwsim_port_del_work(struct work_struct *work);
static void wwan_hwsim_dev_del_work(struct work_struct *work);

static netdev_tx_t wwan_hwsim_netdev_xmit(struct sk_buff *skb,
					  struct net_device *ndev)
{ … }

static const struct net_device_ops wwan_hwsim_netdev_ops = …;

static void wwan_hwsim_netdev_setup(struct net_device *ndev)
{ … }

static const struct wwan_ops wwan_hwsim_wwan_rtnl_ops = …;

static int wwan_hwsim_port_start(struct wwan_port *wport)
{ … }

static void wwan_hwsim_port_stop(struct wwan_port *wport)
{ … }

/* Implements a minimalistic AT commands parser that echo input back and
 * reply with 'OK' to each input command. See AT command protocol details in the
 * ITU-T V.250 recomendations document.
 *
 * Be aware that this processor is not fully V.250 compliant.
 */
static int wwan_hwsim_port_tx(struct wwan_port *wport, struct sk_buff *in)
{ … }

static const struct wwan_port_ops wwan_hwsim_port_ops = …;

static struct wwan_hwsim_port *wwan_hwsim_port_new(struct wwan_hwsim_dev *dev)
{ … }

static void wwan_hwsim_port_del(struct wwan_hwsim_port *port)
{ … }

static void wwan_hwsim_port_del_work(struct work_struct *work)
{ … }

static void wwan_hwsim_dev_release(struct device *sysdev)
{ … }

static struct wwan_hwsim_dev *wwan_hwsim_dev_new(void)
{ … }

static void wwan_hwsim_dev_del(struct wwan_hwsim_dev *dev)
{ … }

static void wwan_hwsim_dev_del_work(struct work_struct *work)
{ … }

static ssize_t wwan_hwsim_debugfs_portdestroy_write(struct file *file,
						    const char __user *usrbuf,
						    size_t count, loff_t *ppos)
{ … }

static const struct file_operations wwan_hwsim_debugfs_portdestroy_fops = …;

static ssize_t wwan_hwsim_debugfs_portcreate_write(struct file *file,
						   const char __user *usrbuf,
						   size_t count, loff_t *ppos)
{ … }

static const struct file_operations wwan_hwsim_debugfs_portcreate_fops = …;

static ssize_t wwan_hwsim_debugfs_devdestroy_write(struct file *file,
						   const char __user *usrbuf,
						   size_t count, loff_t *ppos)
{ … }

static const struct file_operations wwan_hwsim_debugfs_devdestroy_fops = …;

static ssize_t wwan_hwsim_debugfs_devcreate_write(struct file *file,
						  const char __user *usrbuf,
						  size_t count, loff_t *ppos)
{ … }

static const struct file_operations wwan_hwsim_debugfs_devcreate_fops = …;

static int __init wwan_hwsim_init_devs(void)
{ … }

static void wwan_hwsim_free_devs(void)
{ … }

static int __init wwan_hwsim_init(void)
{ … }

static void __exit wwan_hwsim_exit(void)
{ … }

module_init(…) …;
module_exit(wwan_hwsim_exit);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;