1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2021, Linaro Ltd <loic.poulain@linaro.org> */
#ifndef __WWAN_H
#define __WWAN_H
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/skbuff.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 {
WWAN_PORT_AT,
WWAN_PORT_MBIM,
WWAN_PORT_QMI,
WWAN_PORT_QCDM,
WWAN_PORT_FIREHOSE,
/* Add new port types above this line */
__WWAN_PORT_MAX,
WWAN_PORT_MAX = __WWAN_PORT_MAX - 1,
WWAN_PORT_UNKNOWN,
};
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: The routine that sends WWAN port protocol data to the device.
*
* The wwan_port_ops structure contains a list of low-level operations
* that control a WWAN port device. All functions are mandatory.
*/
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);
};
/**
* 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);
#endif /* __WWAN_H */
|