include/linux/wwan.h

Source file repositories/reference/linux-study-clean/include/linux/wwan.h

File Facts

System
Linux kernel
Corpus path
include/linux/wwan.h
Extension
.h
Size
6219 bytes
Lines
208
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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);
};

/** struct wwan_port_caps - The WWAN port capbilities
 * @frag_len: WWAN port TX fragments length
 * @headroom_len: WWAN port TX fragments reserved headroom length
 */
struct wwan_port_caps {
	size_t frag_len;
	unsigned int headroom_len;
};

/**
 * 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
 * @caps: WWAN port capabilities
 * @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,
				   struct wwan_port_caps *caps,
				   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

Annotation

Implementation Notes