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/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2021, Linaro Ltd <> */
#ifndef __WWAN_H
#define __WWAN_H
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/netdevice.h>
* enum wwan_port_type - WWAN port types
* @WWAN_PORT_AT: AT commands
* @WWAN_PORT_MBIM: Mobile Broadband Interface Model control
* @WWAN_PORT_QMI: Qcom modem/MSM interface for modem control
* @WWAN_PORT_QCDM: Qcom Modem diagnostic interface
* @WWAN_PORT_FIREHOSE: XML based command protocol
* @WWAN_PORT_MAX: Highest supported port types
* @WWAN_PORT_UNKNOWN: Special value to indicate an unknown port type
* @__WWAN_PORT_MAX: Internal use
enum wwan_port_type {
/* Add new port types above this line */
struct wwan_port;
/** struct wwan_port_ops - The WWAN port operations
* @start: The routine for starting the WWAN port device.
* @stop: The routine for stopping the WWAN port device.
* @tx: Non-blocking routine that sends WWAN port protocol data to the device.
* @tx_blocking: Optional blocking routine that sends WWAN port protocol data
* to the device.
* @tx_poll: Optional routine that sets additional TX poll flags.
* The wwan_port_ops structure contains a list of low-level operations
* that control a WWAN port device. All functions are mandatory unless specified.
struct wwan_port_ops {
int (*start)(struct wwan_port *port);
void (*stop)(struct wwan_port *port);
int (*tx)(struct wwan_port *port, struct sk_buff *skb);
/* Optional operations */
int (*tx_blocking)(struct wwan_port *port, struct sk_buff *skb);
__poll_t (*tx_poll)(struct wwan_port *port, struct file *filp,
poll_table *wait);
* wwan_create_port - Add a new WWAN port
* @parent: Device to use as parent and shared by all WWAN ports
* @type: WWAN port type
* @ops: WWAN port operations
* @drvdata: Pointer to caller driver data
* Allocate and register a new WWAN port. The port will be automatically exposed
* to user as a character device and attached to the right virtual WWAN device,
* based on the parent pointer. The parent pointer is the device shared by all
* components of a same WWAN modem (e.g. USB dev, PCI dev, MHI controller...).
* drvdata will be placed in the WWAN port device driver data and can be
* retrieved with wwan_port_get_drvdata().
* This function must be balanced with a call to wwan_remove_port().
* Returns a valid pointer to wwan_port on success or PTR_ERR on failure
struct wwan_port *wwan_create_port(struct device *parent,
enum wwan_port_type type,
const struct wwan_port_ops *ops,
void *drvdata);
* wwan_remove_port - Remove a WWAN port
* @port: WWAN port to remove
* Remove a previously created port.
void wwan_remove_port(struct wwan_port *port);
* wwan_port_rx - Receive data from the WWAN port
* @port: WWAN port for which data is received
* @skb: Pointer to the rx buffer
* A port driver calls this function upon data reception (MBIM, AT...).
void wwan_port_rx(struct wwan_port *port, struct sk_buff *skb);
* wwan_port_txoff - Stop TX on WWAN port
* @port: WWAN port for which TX must be stopped
* Used for TX flow control, a port driver calls this function to indicate TX
* is temporary unavailable (e.g. due to ring buffer fullness).
void wwan_port_txoff(struct wwan_port *port);
* wwan_port_txon - Restart TX on WWAN port
* @port: WWAN port for which TX must be restarted
* Used for TX flow control, a port driver calls this function to indicate TX
* is available again.
void wwan_port_txon(struct wwan_port *port);
* wwan_port_get_drvdata - Retrieve driver data from a WWAN port
* @port: Related WWAN port
void *wwan_port_get_drvdata(struct wwan_port *port);
* struct wwan_netdev_priv - WWAN core network device private data
* @link_id: WWAN device data link id
* @drv_priv: driver private data area, size is determined in &wwan_ops
struct wwan_netdev_priv {
u32 link_id;
/* must be last */
u8 drv_priv[] __aligned(sizeof(void *));
static inline void *wwan_netdev_drvpriv(struct net_device *dev)
return ((struct wwan_netdev_priv *)netdev_priv(dev))->drv_priv;
* Used to indicate that the WWAN core should not create a default network
* link.
* struct wwan_ops - WWAN device ops
* @priv_size: size of private netdev data area
* @setup: set up a new netdev
* @newlink: register the new netdev
* @dellink: remove the given netdev
struct wwan_ops {
unsigned int priv_size;
void (*setup)(struct net_device *dev);
int (*newlink)(void *ctxt, struct net_device *dev,
u32 if_id, struct netlink_ext_ack *extack);
void (*dellink)(void *ctxt, struct net_device *dev,
struct list_head *head);
int wwan_register_ops(struct device *parent, const struct wwan_ops *ops,
void *ctxt, u32 def_link_id);
void wwan_unregister_ops(struct device *parent);
#endif /* __WWAN_H */