drivers/w1/w1_netlink.h

   1 /*
   2  * w1_netlink.h
   3  *
   4  * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
   5  *
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #ifndef __W1_NETLINK_H
  23 #define __W1_NETLINK_H
  24
  25 #include <asm/types.h>
  26 #include <linux/connector.h>
  27
  28 #include "w1.h"
  29
  30 /**
  31  * enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags
  32  *
  33  * @W1_CN_BUNDLE: Request bundling replies into fewer messagse.  Be prepared
  34  * to handle multiple struct cn_msg, struct w1_netlink_msg, and
  35  * struct w1_netlink_cmd in one packet.
  36  */
  37 enum w1_cn_msg_flags {
  38         W1_CN_BUNDLE = 1,
  39 };
  40
  41 /**
  42  * enum w1_netlink_message_types - message type
  43  *
  44  * @W1_SLAVE_ADD: notification that a slave device was added
  45  * @W1_SLAVE_REMOVE: notification that a slave device was removed
  46  * @W1_MASTER_ADD: notification that a new bus master was added
  47  * @W1_MASTER_REMOVE: notification that a bus masterwas removed
  48  * @W1_MASTER_CMD: initiate operations on a specific master
  49  * @W1_SLAVE_CMD: sends reset, selects the slave, then does a read/write/touch
  50  * operation
  51  * @W1_LIST_MASTERS: used to determine the bus master identifiers
  52  */
  53 enum w1_netlink_message_types {
  54         W1_SLAVE_ADD = 0,
  55         W1_SLAVE_REMOVE,
  56         W1_MASTER_ADD,
  57         W1_MASTER_REMOVE,
  58         W1_MASTER_CMD,
  59         W1_SLAVE_CMD,
  60         W1_LIST_MASTERS,
  61 };
  62
  63 /**
  64  * struct w1_netlink_msg - holds w1 message type, id, and result
  65  *
  66  * @type: one of enum w1_netlink_message_types
  67  * @status: kernel feedback for success 0 or errno failure value
  68  * @len: length of data following w1_netlink_msg
  69  * @id: union holding master bus id (msg.id) and slave device id (id[8]).
  70  * @data: start address of any following data
  71  *
  72  * The base message structure for w1 messages over netlink.
  73  * The netlink connector data sequence is, struct nlmsghdr, struct cn_msg,
  74  * then one or more struct w1_netlink_msg (each with optional data).
  75  */
  76 struct w1_netlink_msg
  77 {
  78         __u8                            type;
  79         __u8                            status;
  80         __u16                           len;
  81         union {
  82                 __u8                    id[8];
  83                 struct w1_mst {
  84                         __u32           id;
  85                         __u32           res;
  86                 } mst;
  87         } id;
  88         __u8                            data[0];
  89 };
  90
  91 /**
  92  * enum w1_commands - commands available for master or slave operations
  93  *
  94  * @W1_CMD_READ: read len bytes
  95  * @W1_CMD_WRITE: write len bytes
  96  * @W1_CMD_SEARCH: initiate a standard search, returns only the slave
  97  * devices found during that search
  98  * @W1_CMD_ALARM_SEARCH: search for devices that are currently alarming
  99  * @W1_CMD_TOUCH: Touches a series of bytes.
 100  * @W1_CMD_RESET: sends a bus reset on the given master
 101  * @W1_CMD_SLAVE_ADD: adds a slave to the given master,
 102  * 8 byte slave id at data[0]
 103  * @W1_CMD_SLAVE_REMOVE: removes a slave to the given master,
 104  * 8 byte slave id at data[0]
 105  * @W1_CMD_LIST_SLAVES: list of slaves registered on this master
 106  * @W1_CMD_MAX: number of available commands
 107  */
 108 enum w1_commands {
 109         W1_CMD_READ = 0,
 110         W1_CMD_WRITE,
 111         W1_CMD_SEARCH,
 112         W1_CMD_ALARM_SEARCH,
 113         W1_CMD_TOUCH,
 114         W1_CMD_RESET,
 115         W1_CMD_SLAVE_ADD,
 116         W1_CMD_SLAVE_REMOVE,
 117         W1_CMD_LIST_SLAVES,
 118         W1_CMD_MAX
 119 };
 120
 121 /**
 122  * struct w1_netlink_cmd - holds the command and data
 123  *
 124  * @cmd: one of enum w1_commands
 125  * @res: reserved
 126  * @len: length of data following w1_netlink_cmd
 127  * @data: start address of any following data
 128  *
 129  * One or more struct w1_netlink_cmd is placed starting at w1_netlink_msg.data
 130  * each with optional data.
 131  */
 132 struct w1_netlink_cmd
 133 {
 134         __u8                            cmd;
 135         __u8                            res;
 136         __u16                           len;
 137         __u8                            data[0];
 138 };
 139
 140 #ifdef __KERNEL__
 141
 142 void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *);
 143 int w1_init_netlink(void);
 144 void w1_fini_netlink(void);
 145
 146 #endif /* __KERNEL__ */
 147 #endif /* __W1_NETLINK_H */