209 строки
4.7 KiB
C
209 строки
4.7 KiB
C
/*
|
|
* 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 <net/sock.h>
|
|
|
|
#include <asm/semaphore.h>
|
|
|
|
#include "w1_family.h"
|
|
|
|
#define W1_MAXNAMELEN 32
|
|
#define W1_SLAVE_DATA_SIZE 128
|
|
|
|
#define W1_SEARCH 0xF0
|
|
#define W1_CONDITIONAL_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 (1<<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)(unsigned long, 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 */
|
|
unsigned long data;
|
|
|
|
/**
|
|
* Sample the line level
|
|
* @return the level read (0 or 1)
|
|
*/
|
|
u8 (*read_bit)(unsigned long);
|
|
|
|
/** Sets the line level */
|
|
void (*write_bit)(unsigned long, 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)(unsigned long, u8);
|
|
|
|
/**
|
|
* Reads a bytes. Same as 8 touch_bit(1) calls.
|
|
* @return the byte read
|
|
*/
|
|
u8 (*read_byte)(unsigned long);
|
|
|
|
/**
|
|
* Writes a byte. Same as 8 touch_bit(x) calls.
|
|
*/
|
|
void (*write_byte)(unsigned long, u8);
|
|
|
|
/**
|
|
* Same as a series of read_byte() calls
|
|
* @return the number of bytes read
|
|
*/
|
|
u8 (*read_block)(unsigned long, u8 *, int);
|
|
|
|
/** Same as a series of write_byte() calls */
|
|
void (*write_block)(unsigned long, const u8 *, int);
|
|
|
|
/**
|
|
* Combines two reads and a smart write for ROM searches
|
|
* @return bit0=Id bit1=comp_id bit2=dir_taken
|
|
*/
|
|
u8 (*triplet)(unsigned long, 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)(unsigned long);
|
|
|
|
/** Really nice hardware can handles the ROM searches */
|
|
void (*search)(unsigned long, w1_slave_found_callback);
|
|
};
|
|
|
|
#define W1_MASTER_NEED_EXIT 0
|
|
#define W1_MASTER_NEED_RECONNECT 1
|
|
|
|
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;
|
|
|
|
long flags;
|
|
|
|
pid_t kpid;
|
|
struct semaphore mutex;
|
|
|
|
struct device_driver *driver;
|
|
struct device dev;
|
|
struct completion dev_exited;
|
|
|
|
struct w1_bus_master *bus_master;
|
|
|
|
u32 seq, groups;
|
|
struct sock *nls;
|
|
};
|
|
|
|
int w1_create_master_attributes(struct w1_master *);
|
|
void w1_search(struct w1_master *dev, w1_slave_found_callback cb);
|
|
|
|
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);
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __W1_H */
|