[net-next-2.6.git] / drivers / w1 / w1.h

/*
 *	w1.h
 *
 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef __W1_H
#define __W1_H

struct w1_reg_num
{
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u64	family:8,
		id:48,
		crc:8;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u64	crc:8,
		id:48,
		family:8;
#else
#error "Please fix <asm/byteorder.h>"
#endif
};

#ifdef __KERNEL__

#include <linux/completion.h>
#include <linux/device.h>
#include <linux/mutex.h>

#include "w1_family.h"

#define W1_MAXNAMELEN		32

#define W1_SEARCH		0xF0
#define W1_ALARM_SEARCH		0xEC
#define W1_CONVERT_TEMP		0x44
#define W1_SKIP_ROM		0xCC
#define W1_READ_SCRATCHPAD	0xBE
#define W1_READ_ROM		0x33
#define W1_READ_PSUPPLY		0xB4
#define W1_MATCH_ROM		0x55

#define W1_SLAVE_ACTIVE		0

struct w1_slave
{
	struct module		*owner;
	unsigned char		name[W1_MAXNAMELEN];
	struct list_head	w1_slave_entry;
	struct w1_reg_num	reg_num;
	atomic_t		refcnt;
	u8			rom[9];
	u32			flags;
	int			ttl;

	struct w1_master	*master;
	struct w1_family	*family;
	void			*family_data;
	struct device		dev;
	struct completion	released;
};

typedef void (*w1_slave_found_callback)(struct w1_master *, u64);


/**
 * Note: read_bit and write_bit are very low level functions and should only
 * be used with hardware that doesn't really support 1-wire operations,
 * like a parallel/serial port.
 * Either define read_bit and write_bit OR define, at minimum, touch_bit and
 * reset_bus.
 */
struct w1_bus_master
{
	/** the first parameter in all the functions below */
	void		*data;

	/**
	 * Sample the line level
	 * @return the level read (0 or 1)
	 */
	u8		(*read_bit)(void *);

	/** Sets the line level */
	void		(*write_bit)(void *, u8);

	/**
	 * touch_bit is the lowest-level function for devices that really
	 * support the 1-wire protocol.
	 * touch_bit(0) = write-0 cycle
	 * touch_bit(1) = write-1 / read cycle
	 * @return the bit read (0 or 1)
	 */
	u8		(*touch_bit)(void *, u8);

	/**
	 * Reads a bytes. Same as 8 touch_bit(1) calls.
	 * @return the byte read
	 */
	u8		(*read_byte)(void *);

	/**
	 * Writes a byte. Same as 8 touch_bit(x) calls.
	 */
	void		(*write_byte)(void *, u8);

	/**
	 * Same as a series of read_byte() calls
	 * @return the number of bytes read
	 */
	u8		(*read_block)(void *, u8 *, int);

	/** Same as a series of write_byte() calls */
	void		(*write_block)(void *, const u8 *, int);

	/**
	 * Combines two reads and a smart write for ROM searches
	 * @return bit0=Id bit1=comp_id bit2=dir_taken
	 */
	u8		(*triplet)(void *, u8);

	/**
	 * long write-0 with a read for the presence pulse detection
	 * @return -1=Error, 0=Device present, 1=No device present
	 */
	u8		(*reset_bus)(void *);

	/**
	 * Put out a strong pull-up pulse of the specified duration.
	 * @return -1=Error, 0=completed
	 */
	u8		(*set_pullup)(void *, int);

	/** Really nice hardware can handles the different types of ROM search
	 *  w1_master* is passed to the slave found callback.
	 */
	void		(*search)(void *, struct w1_master *,
		u8, w1_slave_found_callback);
};

struct w1_master
{
	struct list_head	w1_master_entry;
	struct module		*owner;
	unsigned char		name[W1_MAXNAMELEN];
	struct list_head	slist;
	int			max_slave_count, slave_count;
	unsigned long		attempts;
	int			slave_ttl;
	int			initialized;
	u32			id;
	int			search_count;

	atomic_t		refcnt;

	void			*priv;
	int			priv_size;

	/** 5V strong pullup enabled flag, 1 enabled, zero disabled. */
	int			enable_pullup;
	/** 5V strong pullup duration in milliseconds, zero disabled. */
	int			pullup_duration;

	struct task_struct	*thread;
	struct mutex		mutex;

	struct device_driver	*driver;
	struct device		dev;

	struct w1_bus_master	*bus_master;

	u32			seq;
};

int w1_create_master_attributes(struct w1_master *);
void w1_destroy_master_attributes(struct w1_master *master);
void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
struct w1_slave *w1_search_slave(struct w1_reg_num *id);
void w1_search_process(struct w1_master *dev, u8 search_type);
struct w1_master *w1_search_master_id(u32 id);

/* Disconnect and reconnect devices in the given family.  Used for finding
 * unclaimed devices after a family has been registered or releasing devices
 * after a family has been unregistered.  Set attach to 1 when a new family
 * has just been registered, to 0 when it has been unregistered.
 */
void w1_reconnect_slaves(struct w1_family *f, int attach);
void w1_slave_detach(struct w1_slave *sl);

u8 w1_triplet(struct w1_master *dev, int bdir);
void w1_write_8(struct w1_master *, u8);
u8 w1_read_8(struct w1_master *);
int w1_reset_bus(struct w1_master *);
u8 w1_calc_crc8(u8 *, int);
void w1_write_block(struct w1_master *, const u8 *, int);
void w1_touch_block(struct w1_master *, u8 *, int);
u8 w1_read_block(struct w1_master *, u8 *, int);
int w1_reset_select_slave(struct w1_slave *sl);
void w1_next_pullup(struct w1_master *, int);

static inline struct w1_slave* dev_to_w1_slave(struct device *dev)
{
	return container_of(dev, struct w1_slave, dev);
}

static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj)
{
	return dev_to_w1_slave(container_of(kobj, struct device, kobj));
}

static inline struct w1_master* dev_to_w1_master(struct device *dev)
{
	return container_of(dev, struct w1_master, dev);
}

extern struct device_driver w1_master_driver;
extern struct device w1_master_device;
extern int w1_max_slave_count;
extern int w1_max_slave_ttl;
extern struct list_head w1_masters;
extern struct mutex w1_mlock;

extern int w1_process(void *);

#endif /* __KERNEL__ */

#endif /* __W1_H */
Commit	Line	Data
1da177e4	1	/*
7785925d	2	* w1.h
1da177e4 LT	3	*
1da177e4 LT	4	* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
7785925d	5	*
1da177e4 LT	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_H
	23	#define __W1_H
	24
	25	struct w1_reg_num
	26	{
	27	#if defined(__LITTLE_ENDIAN_BITFIELD)
6b729861 EP	28	__u64 family:8,
	29	id:48,
	30	crc:8;
1da177e4 LT	31	#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>
abd52a13	44	#include <linux/mutex.h>
1da177e4 LT	45
	46	#include "w1_family.h"
	47
	48	#define W1_MAXNAMELEN 32
1da177e4 LT	49
1da177e4 LT	50	#define W1_SEARCH 0xF0
12003375	51	#define W1_ALARM_SEARCH 0xEC
1da177e4 LT	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
f522d239	59	#define W1_SLAVE_ACTIVE 0
1da177e4 LT	60
	61	struct w1_slave
	62	{
	63	struct module *owner;
	64	unsigned char name[W1_MAXNAMELEN];
	65	struct list_head w1_slave_entry;
	66	struct w1_reg_num reg_num;
	67	atomic_t refcnt;
	68	u8 rom[9];
	69	u32 flags;
	70	int ttl;
	71
	72	struct w1_master *master;
7785925d	73	struct w1_family *family;
a45f105a	74	void *family_data;
7785925d	75	struct device dev;
3aca692d	76	struct completion released;
1da177e4 LT	77	};
1da177e4 LT	78
c30c9b15	79	typedef void (w1_slave_found_callback)(struct w1_master , u64);
1da177e4	80
6b729861 EP	81
	82	/**
	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
	87	* reset_bus.
	88	*/
1da177e4 LT	89	struct w1_bus_master
1da177e4 LT	90	{
6b729861	91	/** the first parameter in all the functions below */
ccd69940	92	void *data;
6b729861 EP	93
	94	/**
	95	* Sample the line level
	96	* @return the level read (0 or 1)
	97	*/
ccd69940	98	u8 (read_bit)(void );
6b729861 EP	99
6b729861 EP	100	/** Sets the line level */
ccd69940	101	void (write_bit)(void , u8);
6b729861 EP	102
	103	/**
	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)
	109	*/
ccd69940	110	u8 (touch_bit)(void , u8);
6b729861 EP	111
	112	/**
	113	* Reads a bytes. Same as 8 touch_bit(1) calls.
	114	* @return the byte read
	115	*/
ccd69940	116	u8 (read_byte)(void );
6b729861 EP	117
	118	/**
	119	* Writes a byte. Same as 8 touch_bit(x) calls.
	120	*/
ccd69940	121	void (write_byte)(void , u8);
6b729861 EP	122
	123	/**
	124	* Same as a series of read_byte() calls
	125	* @return the number of bytes read
	126	*/
ccd69940	127	u8 (read_block)(void , u8 *, int);
6b729861 EP	128
6b729861 EP	129	/** Same as a series of write_byte() calls */
ccd69940	130	void (write_block)(void , const u8 *, int);
6b729861 EP	131
	132	/**
	133	* Combines two reads and a smart write for ROM searches
	134	* @return bit0=Id bit1=comp_id bit2=dir_taken
	135	*/
ccd69940	136	u8 (triplet)(void , u8);
6b729861 EP	137
	138	/**
	139	* long write-0 with a read for the presence pulse detection
	140	* @return -1=Error, 0=Device present, 1=No device present
	141	*/
ccd69940	142	u8 (reset_bus)(void );
6b729861	143
6a158c0d DF	144	/**
	145	* Put out a strong pull-up pulse of the specified duration.
	146	* @return -1=Error, 0=completed
	147	*/
	148	u8 (set_pullup)(void , int);
	149
c30c9b15 DF	150	/** Really nice hardware can handles the different types of ROM search
	151	* w1_master* is passed to the slave found callback.
	152	*/
	153	void (search)(void , struct w1_master *,
	154	u8, w1_slave_found_callback);
1da177e4 LT	155	};
	156
	157	struct 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;
2a9d0c17	168	int search_count;
1da177e4 LT	169
	170	atomic_t refcnt;
	171
	172	void *priv;
	173	int priv_size;
	174
6a158c0d DF	175	/** 5V strong pullup enabled flag, 1 enabled, zero disabled. */
	176	int enable_pullup;
	177	/** 5V strong pullup duration in milliseconds, zero disabled. */
	178	int pullup_duration;
	179
674a396c	180	struct task_struct *thread;
abd52a13	181	struct mutex mutex;
1da177e4 LT	182
1da177e4 LT	183	struct device_driver *driver;
7785925d	184	struct device dev;
1da177e4 LT	185
	186	struct w1_bus_master *bus_master;
	187
12003375	188	u32 seq;
1da177e4 LT	189	};
	190
	191	int w1_create_master_attributes(struct w1_master *);
c30c9b15	192	void w1_destroy_master_attributes(struct w1_master *master);
12003375 EP	193	void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
	194	void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
	195	struct w1_slave w1_search_slave(struct w1_reg_num id);
	196	void w1_search_process(struct w1_master *dev, u8 search_type);
	197	struct w1_master *w1_search_master_id(u32 id);
	198
c30c9b15 DF	199	/* Disconnect and reconnect devices in the given family. Used for finding
	200	* unclaimed devices after a family has been registered or releasing devices
	201	* after a family has been unregistered. Set attach to 1 when a new family
	202	* has just been registered, to 0 when it has been unregistered.
	203	*/
	204	void w1_reconnect_slaves(struct w1_family *f, int attach);
	205	void w1_slave_detach(struct w1_slave *sl);
	206
12003375 EP	207	u8 w1_triplet(struct w1_master *dev, int bdir);
12003375 EP	208	void w1_write_8(struct w1_master *, u8);
34e453d4	209	u8 w1_read_8(struct w1_master *);
12003375 EP	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);
9be62e0b	213	void w1_touch_block(struct w1_master , u8 , int);
12003375 EP	214	u8 w1_read_block(struct w1_master , u8 , int);
12003375 EP	215	int w1_reset_select_slave(struct w1_slave *sl);
6a158c0d	216	void w1_next_pullup(struct w1_master *, int);
1da177e4	217
db2d0008 EP	218	static inline struct w1_slave* dev_to_w1_slave(struct device *dev)
	219	{
	220	return container_of(dev, struct w1_slave, dev);
	221	}
	222
	223	static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj)
	224	{
	225	return dev_to_w1_slave(container_of(kobj, struct device, kobj));
	226	}
	227
	228	static inline struct w1_master* dev_to_w1_master(struct device *dev)
	229	{
	230	return container_of(dev, struct w1_master, dev);
	231	}
	232
2c5bfdac	233	extern struct device_driver w1_master_driver;
2c5bfdac EP	234	extern struct device w1_master_device;
	235	extern int w1_max_slave_count;
	236	extern int w1_max_slave_ttl;
	237	extern struct list_head w1_masters;
	238	extern struct mutex w1_mlock;
	239
	240	extern int w1_process(void *);
	241
1da177e4 LT	242	#endif /* __KERNEL__ */
	243
	244	#endif /* __W1_H */