4 * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
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
50 #define W1_SEARCH 0xF0
51 #define W1_ALARM_SEARCH 0xEC
52 #define W1_CONVERT_TEMP 0x44
53 #define W1_SKIP_ROM 0xCC
54 #define W1_READ_SCRATCHPAD 0xBE
55 #define W1_READ_ROM 0x33
56 #define W1_READ_PSUPPLY 0xB4
57 #define W1_MATCH_ROM 0x55
58 #define W1_RESUME_CMD 0xA5
60 #define W1_SLAVE_ACTIVE 0
61 #define W1_SLAVE_DETACH 1
66 unsigned char name[W1_MAXNAMELEN];
67 struct list_head w1_slave_entry;
68 struct w1_reg_num reg_num;
73 struct w1_master *master;
74 struct w1_family *family;
79 typedef void (*w1_slave_found_callback)(struct w1_master *, u64);
83 * Note: read_bit and write_bit are very low level functions and should only
84 * be used with hardware that doesn't really support 1-wire operations,
85 * like a parallel/serial port.
86 * Either define read_bit and write_bit OR define, at minimum, touch_bit and
91 /** the first parameter in all the functions below */
95 * Sample the line level
96 * @return the level read (0 or 1)
98 u8 (*read_bit)(void *);
100 /** Sets the line level */
101 void (*write_bit)(void *, u8);
104 * touch_bit is the lowest-level function for devices that really
105 * support the 1-wire protocol.
106 * touch_bit(0) = write-0 cycle
107 * touch_bit(1) = write-1 / read cycle
108 * @return the bit read (0 or 1)
110 u8 (*touch_bit)(void *, u8);
113 * Reads a bytes. Same as 8 touch_bit(1) calls.
114 * @return the byte read
116 u8 (*read_byte)(void *);
119 * Writes a byte. Same as 8 touch_bit(x) calls.
121 void (*write_byte)(void *, u8);
124 * Same as a series of read_byte() calls
125 * @return the number of bytes read
127 u8 (*read_block)(void *, u8 *, int);
129 /** Same as a series of write_byte() calls */
130 void (*write_block)(void *, const u8 *, int);
133 * Combines two reads and a smart write for ROM searches
134 * @return bit0=Id bit1=comp_id bit2=dir_taken
136 u8 (*triplet)(void *, u8);
139 * long write-0 with a read for the presence pulse detection
140 * @return -1=Error, 0=Device present, 1=No device present
142 u8 (*reset_bus)(void *);
145 * Put out a strong pull-up pulse of the specified duration.
146 * @return -1=Error, 0=completed
148 u8 (*set_pullup)(void *, int);
150 /** Really nice hardware can handles the different types of ROM search
151 * w1_master* is passed to the slave found callback.
152 * u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH
154 void (*search)(void *, struct w1_master *,
155 u8, w1_slave_found_callback);
159 * enum w1_master_flags - bitfields used in w1_master.flags
160 * @W1_ABORT_SEARCH: abort searching early on shutdown
161 * @W1_WARN_MAX_COUNT: limit warning when the maximum count is reached
163 enum w1_master_flags {
165 W1_WARN_MAX_COUNT = 1,
170 struct list_head w1_master_entry;
171 struct module *owner;
172 unsigned char name[W1_MAXNAMELEN];
173 /* list_mutex protects just slist and async_list so slaves can be
174 * searched for and async commands added while the master has
175 * w1_master.mutex locked and is operating on the bus.
176 * lock order w1_mlock, w1_master.mutex, w1_master_list_mutex
178 struct mutex list_mutex;
179 struct list_head slist;
180 struct list_head async_list;
181 int max_slave_count, slave_count;
182 unsigned long attempts;
187 /* id to start searching on, to continue a search or 0 to restart */
195 /** 5V strong pullup enabled flag, 1 enabled, zero disabled. */
197 /** 5V strong pullup duration in milliseconds, zero disabled. */
202 struct task_struct *thread;
204 struct mutex bus_mutex;
206 struct device_driver *driver;
209 struct w1_bus_master *bus_master;
212 /* port id to send netlink responses to. The value is temporarily
213 * stored here while processing a message, set after locking the
214 * mutex, zero before unlocking the mutex.
220 * struct w1_async_cmd - execute callback from the w1_process kthread
221 * @async_entry: link entry
222 * @cb: callback function, must list_del and destroy this list before
225 * When inserted into the w1_master async_list, w1_process will execute
226 * the callback. Embed this into the structure with the command details.
228 struct w1_async_cmd {
229 struct list_head async_entry;
230 void (*cb)(struct w1_master *dev, struct w1_async_cmd *async_cmd);
233 int w1_create_master_attributes(struct w1_master *);
234 void w1_destroy_master_attributes(struct w1_master *master);
235 void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
236 void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
237 /* call w1_unref_slave to release the reference counts w1_search_slave added */
238 struct w1_slave *w1_search_slave(struct w1_reg_num *id);
239 /* decrements the reference on sl->master and sl, and cleans up if zero
240 * returns the reference count after it has been decremented */
241 int w1_unref_slave(struct w1_slave *sl);
242 void w1_slave_found(struct w1_master *dev, u64 rn);
243 void w1_search_process_cb(struct w1_master *dev, u8 search_type,
244 w1_slave_found_callback cb);
245 struct w1_slave *w1_slave_search_device(struct w1_master *dev,
246 struct w1_reg_num *rn);
247 struct w1_master *w1_search_master_id(u32 id);
249 /* Disconnect and reconnect devices in the given family. Used for finding
250 * unclaimed devices after a family has been registered or releasing devices
251 * after a family has been unregistered. Set attach to 1 when a new family
252 * has just been registered, to 0 when it has been unregistered.
254 void w1_reconnect_slaves(struct w1_family *f, int attach);
255 int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn);
256 /* 0 success, otherwise EBUSY */
257 int w1_slave_detach(struct w1_slave *sl);
259 u8 w1_triplet(struct w1_master *dev, int bdir);
260 void w1_write_8(struct w1_master *, u8);
261 u8 w1_read_8(struct w1_master *);
262 int w1_reset_bus(struct w1_master *);
263 u8 w1_calc_crc8(u8 *, int);
264 void w1_write_block(struct w1_master *, const u8 *, int);
265 void w1_touch_block(struct w1_master *, u8 *, int);
266 u8 w1_read_block(struct w1_master *, u8 *, int);
267 int w1_reset_select_slave(struct w1_slave *sl);
268 int w1_reset_resume_command(struct w1_master *);
269 void w1_next_pullup(struct w1_master *, int);
271 static inline struct w1_slave* dev_to_w1_slave(struct device *dev)
273 return container_of(dev, struct w1_slave, dev);
276 static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj)
278 return dev_to_w1_slave(container_of(kobj, struct device, kobj));
281 static inline struct w1_master* dev_to_w1_master(struct device *dev)
283 return container_of(dev, struct w1_master, dev);
286 extern struct device_driver w1_master_driver;
287 extern struct device w1_master_device;
288 extern int w1_max_slave_count;
289 extern int w1_max_slave_ttl;
290 extern struct list_head w1_masters;
291 extern struct mutex w1_mlock;
293 /* returns 1 if there were commands to executed 0 otherwise */
294 extern int w1_process_callbacks(struct w1_master *dev);
295 extern int w1_process(void *);
297 #endif /* __KERNEL__ */