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Applications can submit a set of commands in one packet to the kernel, and in some cases it is required such as reading the temperature sensor results. This adds an option W1_CN_BUNDLE to the flags of cn_msg to request the kernel to reply in one packet for efficiency. The cn_msg flags now check for unknown flag values and return an error if one is seen. See "Proper handling of unknown flags in system calls" http://lwn.net/Articles/588444/ This corrects the ack values returned as per the protocol standard, namely the original ack for status messages and seq + 1 for all others such as the data returned from a read. Some of the common variable names have been standardized as follows. struct cn_msg *cn struct w1_netlink_msg *msg struct w1_netlink_cmd *cmd struct w1_master *dev When an argument and a function scope variable would collide, add req_ to the argument. Signed-off-by: David Fries <David@Fries.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*
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* w1_netlink.h
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*
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* Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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.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 master bus id (msg.id) and slave device id (id[8]).
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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[0];
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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[0];
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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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