4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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.
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.
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
27 #if defined(__LITTLE_ENDIAN_BITFIELD)
31 #elif defined(__BIG_ENDIAN_BITFIELD)
36 #error "Please fix <asm/byteorder.h>"
42 #include <linux/completion.h>
43 #include <linux/device.h>
47 #include <asm/semaphore.h>
49 #include "w1_family.h"
51 #define W1_MAXNAMELEN 32
52 #define W1_SLAVE_DATA_SIZE 128
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
63 #define W1_SLAVE_ACTIVE 0
68 unsigned char name
[W1_MAXNAMELEN
];
69 struct list_head w1_slave_entry
;
70 struct w1_reg_num reg_num
;
76 struct w1_master
*master
;
77 struct w1_family
*family
;
80 struct completion released
;
83 typedef void (* w1_slave_found_callback
)(void *, u64
);
87 * Note: read_bit and write_bit are very low level functions and should only
88 * be used with hardware that doesn't really support 1-wire operations,
89 * like a parallel/serial port.
90 * Either define read_bit and write_bit OR define, at minimum, touch_bit and
95 /** the first parameter in all the functions below */
99 * Sample the line level
100 * @return the level read (0 or 1)
102 u8 (*read_bit
)(void *);
104 /** Sets the line level */
105 void (*write_bit
)(void *, u8
);
108 * touch_bit is the lowest-level function for devices that really
109 * support the 1-wire protocol.
110 * touch_bit(0) = write-0 cycle
111 * touch_bit(1) = write-1 / read cycle
112 * @return the bit read (0 or 1)
114 u8 (*touch_bit
)(void *, u8
);
117 * Reads a bytes. Same as 8 touch_bit(1) calls.
118 * @return the byte read
120 u8 (*read_byte
)(void *);
123 * Writes a byte. Same as 8 touch_bit(x) calls.
125 void (*write_byte
)(void *, u8
);
128 * Same as a series of read_byte() calls
129 * @return the number of bytes read
131 u8 (*read_block
)(void *, u8
*, int);
133 /** Same as a series of write_byte() calls */
134 void (*write_block
)(void *, const u8
*, int);
137 * Combines two reads and a smart write for ROM searches
138 * @return bit0=Id bit1=comp_id bit2=dir_taken
140 u8 (*triplet
)(void *, u8
);
143 * long write-0 with a read for the presence pulse detection
144 * @return -1=Error, 0=Device present, 1=No device present
146 u8 (*reset_bus
)(void *);
148 /** Really nice hardware can handles the ROM searches */
149 void (*search
)(void *, w1_slave_found_callback
);
152 #define W1_MASTER_NEED_EXIT 0
153 #define W1_MASTER_NEED_RECONNECT 1
157 struct list_head w1_master_entry
;
158 struct module
*owner
;
159 unsigned char name
[W1_MAXNAMELEN
];
160 struct list_head slist
;
161 int max_slave_count
, slave_count
;
162 unsigned long attempts
;
175 struct task_struct
*thread
;
176 struct semaphore mutex
;
178 struct device_driver
*driver
;
181 struct w1_bus_master
*bus_master
;
187 int w1_create_master_attributes(struct w1_master
*);
188 void w1_search(struct w1_master
*dev
, w1_slave_found_callback cb
);
190 static inline struct w1_slave
* dev_to_w1_slave(struct device
*dev
)
192 return container_of(dev
, struct w1_slave
, dev
);
195 static inline struct w1_slave
* kobj_to_w1_slave(struct kobject
*kobj
)
197 return dev_to_w1_slave(container_of(kobj
, struct device
, kobj
));
200 static inline struct w1_master
* dev_to_w1_master(struct device
*dev
)
202 return container_of(dev
, struct w1_master
, dev
);
205 extern int w1_max_slave_count
;
206 extern int w1_max_slave_ttl
;
207 extern spinlock_t w1_mlock
;
208 extern struct list_head w1_masters
;
209 extern struct device_driver w1_master_driver
;
210 extern struct device w1_master_device
;
212 int w1_process(void *data
);
213 void w1_reconnect_slaves(struct w1_family
*f
);
215 #endif /* __KERNEL__ */