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>
44 #include <linux/mutex.h>
46 #include "w1_family.h"
48 #define W1_MAXNAMELEN 32
49 #define W1_SLAVE_DATA_SIZE 128
51 #define W1_SEARCH 0xF0
52 #define W1_ALARM_SEARCH 0xEC
53 #define W1_CONVERT_TEMP 0x44
54 #define W1_SKIP_ROM 0xCC
55 #define W1_READ_SCRATCHPAD 0xBE
56 #define W1_READ_ROM 0x33
57 #define W1_READ_PSUPPLY 0xB4
58 #define W1_MATCH_ROM 0x55
60 #define W1_SLAVE_ACTIVE 0
65 unsigned char name
[W1_MAXNAMELEN
];
66 struct list_head w1_slave_entry
;
67 struct w1_reg_num reg_num
;
73 struct w1_master
*master
;
74 struct w1_family
*family
;
77 struct completion released
;
80 typedef void (*w1_slave_found_callback
)(struct w1_master
*, u64
);
84 * Note: read_bit and write_bit are very low level functions and should only
85 * be used with hardware that doesn't really support 1-wire operations,
86 * like a parallel/serial port.
87 * Either define read_bit and write_bit OR define, at minimum, touch_bit and
92 /** the first parameter in all the functions below */
96 * Sample the line level
97 * @return the level read (0 or 1)
99 u8 (*read_bit
)(void *);
101 /** Sets the line level */
102 void (*write_bit
)(void *, u8
);
105 * touch_bit is the lowest-level function for devices that really
106 * support the 1-wire protocol.
107 * touch_bit(0) = write-0 cycle
108 * touch_bit(1) = write-1 / read cycle
109 * @return the bit read (0 or 1)
111 u8 (*touch_bit
)(void *, u8
);
114 * Reads a bytes. Same as 8 touch_bit(1) calls.
115 * @return the byte read
117 u8 (*read_byte
)(void *);
120 * Writes a byte. Same as 8 touch_bit(x) calls.
122 void (*write_byte
)(void *, u8
);
125 * Same as a series of read_byte() calls
126 * @return the number of bytes read
128 u8 (*read_block
)(void *, u8
*, int);
130 /** Same as a series of write_byte() calls */
131 void (*write_block
)(void *, const u8
*, int);
134 * Combines two reads and a smart write for ROM searches
135 * @return bit0=Id bit1=comp_id bit2=dir_taken
137 u8 (*triplet
)(void *, u8
);
140 * long write-0 with a read for the presence pulse detection
141 * @return -1=Error, 0=Device present, 1=No device present
143 u8 (*reset_bus
)(void *);
146 * Put out a strong pull-up pulse of the specified duration.
147 * @return -1=Error, 0=completed
149 u8 (*set_pullup
)(void *, int);
151 /** Really nice hardware can handles the different types of ROM search
152 * w1_master* is passed to the slave found callback.
154 void (*search
)(void *, struct w1_master
*,
155 u8
, w1_slave_found_callback
);
160 struct list_head w1_master_entry
;
161 struct module
*owner
;
162 unsigned char name
[W1_MAXNAMELEN
];
163 struct list_head slist
;
164 int max_slave_count
, slave_count
;
165 unsigned long attempts
;
176 /** 5V strong pullup enabled flag, 1 enabled, zero disabled. */
178 /** 5V strong pullup duration in milliseconds, zero disabled. */
181 struct task_struct
*thread
;
184 struct device_driver
*driver
;
187 struct w1_bus_master
*bus_master
;
192 int w1_create_master_attributes(struct w1_master
*);
193 void w1_destroy_master_attributes(struct w1_master
*master
);
194 void w1_search(struct w1_master
*dev
, u8 search_type
, w1_slave_found_callback cb
);
195 void w1_search_devices(struct w1_master
*dev
, u8 search_type
, w1_slave_found_callback cb
);
196 struct w1_slave
*w1_search_slave(struct w1_reg_num
*id
);
197 void w1_search_process(struct w1_master
*dev
, u8 search_type
);
198 struct w1_master
*w1_search_master_id(u32 id
);
200 /* Disconnect and reconnect devices in the given family. Used for finding
201 * unclaimed devices after a family has been registered or releasing devices
202 * after a family has been unregistered. Set attach to 1 when a new family
203 * has just been registered, to 0 when it has been unregistered.
205 void w1_reconnect_slaves(struct w1_family
*f
, int attach
);
206 void w1_slave_detach(struct w1_slave
*sl
);
208 u8
w1_triplet(struct w1_master
*dev
, int bdir
);
209 void w1_write_8(struct w1_master
*, u8
);
210 int w1_reset_bus(struct w1_master
*);
211 u8
w1_calc_crc8(u8
*, int);
212 void w1_write_block(struct w1_master
*, const u8
*, int);
213 u8
w1_read_block(struct w1_master
*, u8
*, int);
214 int w1_reset_select_slave(struct w1_slave
*sl
);
215 void w1_next_pullup(struct w1_master
*, int);
217 static inline struct w1_slave
* dev_to_w1_slave(struct device
*dev
)
219 return container_of(dev
, struct w1_slave
, dev
);
222 static inline struct w1_slave
* kobj_to_w1_slave(struct kobject
*kobj
)
224 return dev_to_w1_slave(container_of(kobj
, struct device
, kobj
));
227 static inline struct w1_master
* dev_to_w1_master(struct device
*dev
)
229 return container_of(dev
, struct w1_master
, dev
);
232 extern struct device_driver w1_master_driver
;
233 extern struct device w1_master_device
;
234 extern int w1_max_slave_count
;
235 extern int w1_max_slave_ttl
;
236 extern struct list_head w1_masters
;
237 extern struct mutex w1_mlock
;
239 extern int w1_process(void *);
241 #endif /* __KERNEL__ */