aboutsummaryrefslogtreecommitdiff
path: root/drivers/w1/w1_netlink.h
blob: 3041092e84b37146610675962a35293dde99f815 (plain)
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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
 */

#ifndef __W1_NETLINK_H
#define __W1_NETLINK_H

#include <asm/types.h>
#include <linux/connector.h>

#include "w1_internal.h"

/**
 * enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags
 *
 * @W1_CN_BUNDLE: Request bundling replies into fewer messagse.  Be prepared
 * to handle multiple struct cn_msg, struct w1_netlink_msg, and
 * struct w1_netlink_cmd in one packet.
 */
enum w1_cn_msg_flags {
	W1_CN_BUNDLE = 1,
};

/**
 * enum w1_netlink_message_types - message type
 *
 * @W1_SLAVE_ADD: notification that a slave device was added
 * @W1_SLAVE_REMOVE: notification that a slave device was removed
 * @W1_MASTER_ADD: notification that a new bus master was added
 * @W1_MASTER_REMOVE: notification that a bus masterwas removed
 * @W1_MASTER_CMD: initiate operations on a specific master
 * @W1_SLAVE_CMD: sends reset, selects the slave, then does a read/write/touch
 * operation
 * @W1_LIST_MASTERS: used to determine the bus master identifiers
 */
enum w1_netlink_message_types {
	W1_SLAVE_ADD = 0,
	W1_SLAVE_REMOVE,
	W1_MASTER_ADD,
	W1_MASTER_REMOVE,
	W1_MASTER_CMD,
	W1_SLAVE_CMD,
	W1_LIST_MASTERS,
};

/**
 * struct w1_netlink_msg - holds w1 message type, id, and result
 *
 * @type: one of enum w1_netlink_message_types
 * @status: kernel feedback for success 0 or errno failure value
 * @len: length of data following w1_netlink_msg
 * @id: union holding bus master id (msg.id) and slave device id (id[8]).
 * @id.id: Slave ID (8 bytes)
 * @id.mst: bus master identification
 * @id.mst.id: bus master ID
 * @id.mst.res: bus master reserved
 * @data: start address of any following data
 *
 * The base message structure for w1 messages over netlink.
 * The netlink connector data sequence is, struct nlmsghdr, struct cn_msg,
 * then one or more struct w1_netlink_msg (each with optional data).
 */
struct w1_netlink_msg
{
	__u8				type;
	__u8				status;
	__u16				len;
	union {
		__u8			id[8];
		struct w1_mst {
			__u32		id;
			__u32		res;
		} mst;
	} id;
	__u8				data[0];
};

/**
 * enum w1_commands - commands available for master or slave operations
 *
 * @W1_CMD_READ: read len bytes
 * @W1_CMD_WRITE: write len bytes
 * @W1_CMD_SEARCH: initiate a standard search, returns only the slave
 * devices found during that search
 * @W1_CMD_ALARM_SEARCH: search for devices that are currently alarming
 * @W1_CMD_TOUCH: Touches a series of bytes.
 * @W1_CMD_RESET: sends a bus reset on the given master
 * @W1_CMD_SLAVE_ADD: adds a slave to the given master,
 * 8 byte slave id at data[0]
 * @W1_CMD_SLAVE_REMOVE: removes a slave to the given master,
 * 8 byte slave id at data[0]
 * @W1_CMD_LIST_SLAVES: list of slaves registered on this master
 * @W1_CMD_MAX: number of available commands
 */
enum w1_commands {
	W1_CMD_READ = 0,
	W1_CMD_WRITE,
	W1_CMD_SEARCH,
	W1_CMD_ALARM_SEARCH,
	W1_CMD_TOUCH,
	W1_CMD_RESET,
	W1_CMD_SLAVE_ADD,
	W1_CMD_SLAVE_REMOVE,
	W1_CMD_LIST_SLAVES,
	W1_CMD_MAX
};

/**
 * struct w1_netlink_cmd - holds the command and data
 *
 * @cmd: one of enum w1_commands
 * @res: reserved
 * @len: length of data following w1_netlink_cmd
 * @data: start address of any following data
 *
 * One or more struct w1_netlink_cmd is placed starting at w1_netlink_msg.data
 * each with optional data.
 */
struct w1_netlink_cmd
{
	__u8				cmd;
	__u8				res;
	__u16				len;
	__u8				data[0];
};

#ifdef __KERNEL__

void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *);
int w1_init_netlink(void);
void w1_fini_netlink(void);

#endif /* __KERNEL__ */
#endif /* __W1_NETLINK_H */