1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
4  */
5 
6 #ifndef __W1_NETLINK_H
7 #define __W1_NETLINK_H
8 
9 #include <asm/types.h>
10 #include <linux/connector.h>
11 
12 #include "w1_internal.h"
13 
14 /**
15  * enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags
16  *
17  * @W1_CN_BUNDLE: Request bundling replies into fewer messagse.  Be prepared
18  * to handle multiple struct cn_msg, struct w1_netlink_msg, and
19  * struct w1_netlink_cmd in one packet.
20  */
21 enum w1_cn_msg_flags {
22 	W1_CN_BUNDLE = 1,
23 };
24 
25 /**
26  * enum w1_netlink_message_types - message type
27  *
28  * @W1_SLAVE_ADD: notification that a slave device was added
29  * @W1_SLAVE_REMOVE: notification that a slave device was removed
30  * @W1_MASTER_ADD: notification that a new bus master was added
31  * @W1_MASTER_REMOVE: notification that a bus masterwas removed
32  * @W1_MASTER_CMD: initiate operations on a specific master
33  * @W1_SLAVE_CMD: sends reset, selects the slave, then does a read/write/touch
34  * operation
35  * @W1_LIST_MASTERS: used to determine the bus master identifiers
36  */
37 enum w1_netlink_message_types {
38 	W1_SLAVE_ADD = 0,
39 	W1_SLAVE_REMOVE,
40 	W1_MASTER_ADD,
41 	W1_MASTER_REMOVE,
42 	W1_MASTER_CMD,
43 	W1_SLAVE_CMD,
44 	W1_LIST_MASTERS,
45 };
46 
47 /**
48  * struct w1_netlink_msg - holds w1 message type, id, and result
49  *
50  * @type: one of enum w1_netlink_message_types
51  * @status: kernel feedback for success 0 or errno failure value
52  * @len: length of data following w1_netlink_msg
53  * @id: union holding bus master id (msg.id) and slave device id (id[8]).
54  * @id.id: Slave ID (8 bytes)
55  * @id.mst: bus master identification
56  * @id.mst.id: bus master ID
57  * @id.mst.res: bus master reserved
58  * @data: start address of any following data
59  *
60  * The base message structure for w1 messages over netlink.
61  * The netlink connector data sequence is, struct nlmsghdr, struct cn_msg,
62  * then one or more struct w1_netlink_msg (each with optional data).
63  */
64 struct w1_netlink_msg
65 {
66 	__u8				type;
67 	__u8				status;
68 	__u16				len;
69 	union {
70 		__u8			id[8];
71 		struct w1_mst {
72 			__u32		id;
73 			__u32		res;
74 		} mst;
75 	} id;
76 	__u8				data[];
77 };
78 
79 /**
80  * enum w1_commands - commands available for master or slave operations
81  *
82  * @W1_CMD_READ: read len bytes
83  * @W1_CMD_WRITE: write len bytes
84  * @W1_CMD_SEARCH: initiate a standard search, returns only the slave
85  * devices found during that search
86  * @W1_CMD_ALARM_SEARCH: search for devices that are currently alarming
87  * @W1_CMD_TOUCH: Touches a series of bytes.
88  * @W1_CMD_RESET: sends a bus reset on the given master
89  * @W1_CMD_SLAVE_ADD: adds a slave to the given master,
90  * 8 byte slave id at data[0]
91  * @W1_CMD_SLAVE_REMOVE: removes a slave to the given master,
92  * 8 byte slave id at data[0]
93  * @W1_CMD_LIST_SLAVES: list of slaves registered on this master
94  * @W1_CMD_MAX: number of available commands
95  */
96 enum w1_commands {
97 	W1_CMD_READ = 0,
98 	W1_CMD_WRITE,
99 	W1_CMD_SEARCH,
100 	W1_CMD_ALARM_SEARCH,
101 	W1_CMD_TOUCH,
102 	W1_CMD_RESET,
103 	W1_CMD_SLAVE_ADD,
104 	W1_CMD_SLAVE_REMOVE,
105 	W1_CMD_LIST_SLAVES,
106 	W1_CMD_MAX
107 };
108 
109 /**
110  * struct w1_netlink_cmd - holds the command and data
111  *
112  * @cmd: one of enum w1_commands
113  * @res: reserved
114  * @len: length of data following w1_netlink_cmd
115  * @data: start address of any following data
116  *
117  * One or more struct w1_netlink_cmd is placed starting at w1_netlink_msg.data
118  * each with optional data.
119  */
120 struct w1_netlink_cmd
121 {
122 	__u8				cmd;
123 	__u8				res;
124 	__u16				len;
125 	__u8				data[];
126 };
127 
128 #ifdef __KERNEL__
129 
130 void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *);
131 int w1_init_netlink(void);
132 void w1_fini_netlink(void);
133 
134 #endif /* __KERNEL__ */
135 #endif /* __W1_NETLINK_H */
136