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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Evgeniy Polyakov77859252005-05-20 22:33:25 +04002 * w1.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Evgeniy Polyakov77859252005-05-20 22:33:25 +04005 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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_H
23#define __W1_H
24
25struct w1_reg_num
26{
27#if defined(__LITTLE_ENDIAN_BITFIELD)
Evgeniy Polyakov6b729862005-06-04 01:30:43 +040028 __u64 family:8,
29 id:48,
30 crc:8;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#elif defined(__BIG_ENDIAN_BITFIELD)
32 __u64 crc:8,
33 id:48,
34 family:8;
35#else
36#error "Please fix <asm/byteorder.h>"
37#endif
38};
39
40#ifdef __KERNEL__
41
42#include <linux/completion.h>
43#include <linux/device.h>
44
45#include <net/sock.h>
46
47#include <asm/semaphore.h>
48
49#include "w1_family.h"
50
51#define W1_MAXNAMELEN 32
52#define W1_SLAVE_DATA_SIZE 128
53
54#define W1_SEARCH 0xF0
55#define W1_CONDITIONAL_SEARCH 0xEC
56#define W1_CONVERT_TEMP 0x44
57#define W1_SKIP_ROM 0xCC
58#define W1_READ_SCRATCHPAD 0xBE
59#define W1_READ_ROM 0x33
60#define W1_READ_PSUPPLY 0xB4
61#define W1_MATCH_ROM 0x55
62
63#define W1_SLAVE_ACTIVE (1<<0)
64
65struct w1_slave
66{
67 struct module *owner;
68 unsigned char name[W1_MAXNAMELEN];
69 struct list_head w1_slave_entry;
70 struct w1_reg_num reg_num;
71 atomic_t refcnt;
72 u8 rom[9];
73 u32 flags;
74 int ttl;
75
76 struct w1_master *master;
Evgeniy Polyakov77859252005-05-20 22:33:25 +040077 struct w1_family *family;
78 struct device dev;
79 struct completion dev_released;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Evgeniy Polyakov77859252005-05-20 22:33:25 +040081 struct bin_attribute attr_bin;
Evgeniy Polyakovca775c62005-05-20 22:49:08 +040082 struct device_attribute attr_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083};
84
85typedef void (* w1_slave_found_callback)(unsigned long, u64);
86
Evgeniy Polyakov6b729862005-06-04 01:30:43 +040087
88/**
89 * Note: read_bit and write_bit are very low level functions and should only
90 * be used with hardware that doesn't really support 1-wire operations,
91 * like a parallel/serial port.
92 * Either define read_bit and write_bit OR define, at minimum, touch_bit and
93 * reset_bus.
94 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095struct w1_bus_master
96{
Evgeniy Polyakov6b729862005-06-04 01:30:43 +040097 /** the first parameter in all the functions below */
98 unsigned long data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400100 /**
101 * Sample the line level
102 * @return the level read (0 or 1)
103 */
104 u8 (*read_bit)(unsigned long);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400105
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400106 /** Sets the line level */
107 void (*write_bit)(unsigned long, u8);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400108
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400109 /**
110 * touch_bit is the lowest-level function for devices that really
111 * support the 1-wire protocol.
112 * touch_bit(0) = write-0 cycle
113 * touch_bit(1) = write-1 / read cycle
114 * @return the bit read (0 or 1)
115 */
116 u8 (*touch_bit)(unsigned long, u8);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400117
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400118 /**
119 * Reads a bytes. Same as 8 touch_bit(1) calls.
120 * @return the byte read
121 */
122 u8 (*read_byte)(unsigned long);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400123
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400124 /**
125 * Writes a byte. Same as 8 touch_bit(x) calls.
126 */
127 void (*write_byte)(unsigned long, u8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400129 /**
130 * Same as a series of read_byte() calls
131 * @return the number of bytes read
132 */
133 u8 (*read_block)(unsigned long, u8 *, int);
134
135 /** Same as a series of write_byte() calls */
136 void (*write_block)(unsigned long, const u8 *, int);
137
138 /**
139 * Combines two reads and a smart write for ROM searches
140 * @return bit0=Id bit1=comp_id bit2=dir_taken
141 */
142 u8 (*triplet)(unsigned long, u8);
143
144 /**
145 * long write-0 with a read for the presence pulse detection
146 * @return -1=Error, 0=Device present, 1=No device present
147 */
148 u8 (*reset_bus)(unsigned long);
149
150 /** Really nice hardware can handles the ROM searches */
151 void (*search)(unsigned long, w1_slave_found_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152};
153
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400154#define W1_MASTER_NEED_EXIT 0
155#define W1_MASTER_NEED_RECONNECT 1
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157struct w1_master
158{
159 struct list_head w1_master_entry;
160 struct module *owner;
161 unsigned char name[W1_MAXNAMELEN];
162 struct list_head slist;
163 int max_slave_count, slave_count;
164 unsigned long attempts;
165 int slave_ttl;
166 int initialized;
167 u32 id;
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400168 int search_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 atomic_t refcnt;
171
172 void *priv;
173 int priv_size;
174
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400175 long flags;
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 pid_t kpid;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400178 struct semaphore mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 struct device_driver *driver;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400181 struct device dev;
182 struct completion dev_released;
183 struct completion dev_exited;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 struct w1_bus_master *bus_master;
186
187 u32 seq, groups;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400188 struct sock *nls;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189};
190
191int w1_create_master_attributes(struct w1_master *);
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400192void w1_search(struct w1_master *dev, w1_slave_found_callback cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194#endif /* __KERNEL__ */
195
196#endif /* __W1_H */