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/* 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[];
};
/**
* 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[];
};
#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 */
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