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There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://github.com/KSPP/linux/issues/21 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
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*/
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#ifndef __W1_NETLINK_H
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#define __W1_NETLINK_H
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#include <asm/types.h>
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#include <linux/connector.h>
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#include "w1_internal.h"
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/**
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* enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags
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*
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* @W1_CN_BUNDLE: Request bundling replies into fewer messagse. Be prepared
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* to handle multiple struct cn_msg, struct w1_netlink_msg, and
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* struct w1_netlink_cmd in one packet.
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*/
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enum w1_cn_msg_flags {
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W1_CN_BUNDLE = 1,
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};
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/**
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* enum w1_netlink_message_types - message type
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*
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* @W1_SLAVE_ADD: notification that a slave device was added
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* @W1_SLAVE_REMOVE: notification that a slave device was removed
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* @W1_MASTER_ADD: notification that a new bus master was added
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* @W1_MASTER_REMOVE: notification that a bus masterwas removed
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* @W1_MASTER_CMD: initiate operations on a specific master
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* @W1_SLAVE_CMD: sends reset, selects the slave, then does a read/write/touch
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* operation
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* @W1_LIST_MASTERS: used to determine the bus master identifiers
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*/
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enum w1_netlink_message_types {
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W1_SLAVE_ADD = 0,
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W1_SLAVE_REMOVE,
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W1_MASTER_ADD,
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W1_MASTER_REMOVE,
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W1_MASTER_CMD,
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W1_SLAVE_CMD,
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W1_LIST_MASTERS,
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};
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/**
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* struct w1_netlink_msg - holds w1 message type, id, and result
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*
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* @type: one of enum w1_netlink_message_types
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* @status: kernel feedback for success 0 or errno failure value
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* @len: length of data following w1_netlink_msg
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* @id: union holding bus master id (msg.id) and slave device id (id[8]).
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* @id.id: Slave ID (8 bytes)
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* @id.mst: bus master identification
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* @id.mst.id: bus master ID
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* @id.mst.res: bus master reserved
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* @data: start address of any following data
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*
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* The base message structure for w1 messages over netlink.
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* The netlink connector data sequence is, struct nlmsghdr, struct cn_msg,
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* then one or more struct w1_netlink_msg (each with optional data).
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*/
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struct w1_netlink_msg
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{
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__u8 type;
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__u8 status;
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__u16 len;
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union {
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__u8 id[8];
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struct w1_mst {
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__u32 id;
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__u32 res;
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} mst;
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} id;
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__u8 data[];
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};
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/**
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* enum w1_commands - commands available for master or slave operations
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*
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* @W1_CMD_READ: read len bytes
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* @W1_CMD_WRITE: write len bytes
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* @W1_CMD_SEARCH: initiate a standard search, returns only the slave
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* devices found during that search
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* @W1_CMD_ALARM_SEARCH: search for devices that are currently alarming
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* @W1_CMD_TOUCH: Touches a series of bytes.
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* @W1_CMD_RESET: sends a bus reset on the given master
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* @W1_CMD_SLAVE_ADD: adds a slave to the given master,
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* 8 byte slave id at data[0]
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* @W1_CMD_SLAVE_REMOVE: removes a slave to the given master,
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* 8 byte slave id at data[0]
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* @W1_CMD_LIST_SLAVES: list of slaves registered on this master
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* @W1_CMD_MAX: number of available commands
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*/
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enum w1_commands {
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W1_CMD_READ = 0,
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W1_CMD_WRITE,
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W1_CMD_SEARCH,
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W1_CMD_ALARM_SEARCH,
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W1_CMD_TOUCH,
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W1_CMD_RESET,
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W1_CMD_SLAVE_ADD,
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W1_CMD_SLAVE_REMOVE,
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W1_CMD_LIST_SLAVES,
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W1_CMD_MAX
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};
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/**
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* struct w1_netlink_cmd - holds the command and data
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*
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* @cmd: one of enum w1_commands
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* @res: reserved
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* @len: length of data following w1_netlink_cmd
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* @data: start address of any following data
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*
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* One or more struct w1_netlink_cmd is placed starting at w1_netlink_msg.data
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* each with optional data.
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*/
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struct w1_netlink_cmd
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{
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__u8 cmd;
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__u8 res;
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__u16 len;
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__u8 data[];
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};
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#ifdef __KERNEL__
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void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *);
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int w1_init_netlink(void);
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void w1_fini_netlink(void);
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#endif /* __KERNEL__ */
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#endif /* __W1_NETLINK_H */
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