337 строки
9.9 KiB
C
337 строки
9.9 KiB
C
/*
|
|
* Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef __W1_H
|
|
#define __W1_H
|
|
|
|
/**
|
|
* struct w1_reg_num - broken out slave device id
|
|
*
|
|
* @family: identifies the type of device
|
|
* @id: along with family is the unique device id
|
|
* @crc: checksum of the other bytes
|
|
*/
|
|
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_COPY_SCRATCHPAD 0x48
|
|
#define W1_WRITE_SCRATCHPAD 0x4E
|
|
#define W1_READ_SCRATCHPAD 0xBE
|
|
#define W1_READ_ROM 0x33
|
|
#define W1_READ_PSUPPLY 0xB4
|
|
#define W1_MATCH_ROM 0x55
|
|
#define W1_RESUME_CMD 0xA5
|
|
|
|
#define W1_SLAVE_ACTIVE 0
|
|
#define W1_SLAVE_DETACH 1
|
|
|
|
/**
|
|
* struct w1_slave - holds a single slave device on the bus
|
|
*
|
|
* @owner: Points to the one wire "wire" kernel module.
|
|
* @name: Device id is ascii.
|
|
* @w1_slave_entry: data for the linked list
|
|
* @reg_num: the slave id in binary
|
|
* @refcnt: reference count, delete when 0
|
|
* @flags: bit flags for W1_SLAVE_ACTIVE W1_SLAVE_DETACH
|
|
* @ttl: decrement per search this slave isn't found, deatch at 0
|
|
* @master: bus which this slave is on
|
|
* @family: module for device family type
|
|
* @family_data: pointer for use by the family module
|
|
* @dev: kernel device identifier
|
|
*
|
|
*/
|
|
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;
|
|
int ttl;
|
|
unsigned long flags;
|
|
|
|
struct w1_master *master;
|
|
struct w1_family *family;
|
|
void *family_data;
|
|
struct device dev;
|
|
};
|
|
|
|
typedef void (*w1_slave_found_callback)(struct w1_master *, u64);
|
|
|
|
|
|
/**
|
|
* struct w1_bus_master - operations available on a bus master
|
|
*
|
|
* @data: the first parameter in all the functions below
|
|
*
|
|
* @read_bit: Sample the line level @return the level read (0 or 1)
|
|
*
|
|
* @write_bit: Sets the line level
|
|
*
|
|
* @touch_bit: 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)
|
|
*
|
|
* @read_byte: Reads a bytes. Same as 8 touch_bit(1) calls.
|
|
* @return the byte read
|
|
*
|
|
* @write_byte: Writes a byte. Same as 8 touch_bit(x) calls.
|
|
*
|
|
* @read_block: Same as a series of read_byte() calls
|
|
* @return the number of bytes read
|
|
*
|
|
* @write_block: Same as a series of write_byte() calls
|
|
*
|
|
* @triplet: Combines two reads and a smart write for ROM searches
|
|
* @return bit0=Id bit1=comp_id bit2=dir_taken
|
|
*
|
|
* @reset_bus: long write-0 with a read for the presence pulse detection
|
|
* @return -1=Error, 0=Device present, 1=No device present
|
|
*
|
|
* @set_pullup: Put out a strong pull-up pulse of the specified duration.
|
|
* @return -1=Error, 0=completed
|
|
*
|
|
* @search: Really nice hardware can handles the different types of ROM search
|
|
* w1_master* is passed to the slave found callback.
|
|
* u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH
|
|
*
|
|
* 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
|
|
{
|
|
void *data;
|
|
|
|
u8 (*read_bit)(void *);
|
|
|
|
void (*write_bit)(void *, u8);
|
|
|
|
u8 (*touch_bit)(void *, u8);
|
|
|
|
u8 (*read_byte)(void *);
|
|
|
|
void (*write_byte)(void *, u8);
|
|
|
|
u8 (*read_block)(void *, u8 *, int);
|
|
|
|
void (*write_block)(void *, const u8 *, int);
|
|
|
|
u8 (*triplet)(void *, u8);
|
|
|
|
u8 (*reset_bus)(void *);
|
|
|
|
u8 (*set_pullup)(void *, int);
|
|
|
|
void (*search)(void *, struct w1_master *,
|
|
u8, w1_slave_found_callback);
|
|
};
|
|
|
|
/**
|
|
* enum w1_master_flags - bitfields used in w1_master.flags
|
|
* @W1_ABORT_SEARCH: abort searching early on shutdown
|
|
* @W1_WARN_MAX_COUNT: limit warning when the maximum count is reached
|
|
*/
|
|
enum w1_master_flags {
|
|
W1_ABORT_SEARCH = 0,
|
|
W1_WARN_MAX_COUNT = 1,
|
|
};
|
|
|
|
/**
|
|
* struct w1_master - one per bus master
|
|
* @w1_master_entry: master linked list
|
|
* @owner: module owner
|
|
* @name: dynamically allocate bus name
|
|
* @list_mutex: protect slist and async_list
|
|
* @slist: linked list of slaves
|
|
* @async_list: linked list of netlink commands to execute
|
|
* @max_slave_count: maximum number of slaves to search for at a time
|
|
* @slave_count: current number of slaves known
|
|
* @attempts: number of searches ran
|
|
* @slave_ttl: number of searches before a slave is timed out
|
|
* @initialized: prevent init/removal race conditions
|
|
* @id: w1 bus number
|
|
* @search_count: number of automatic searches to run, -1 unlimited
|
|
* @search_id: allows continuing a search
|
|
* @refcnt: reference count
|
|
* @priv: private data storage
|
|
* @enable_pullup: allows a strong pullup
|
|
* @pullup_duration: time for the next strong pullup
|
|
* @flags: one of w1_master_flags
|
|
* @thread: thread for bus search and netlink commands
|
|
* @mutex: protect most of w1_master
|
|
* @bus_mutex: pretect concurrent bus access
|
|
* @driver: sysfs driver
|
|
* @dev: sysfs device
|
|
* @bus_master: io operations available
|
|
* @seq: sequence number used for netlink broadcasts
|
|
*/
|
|
struct w1_master
|
|
{
|
|
struct list_head w1_master_entry;
|
|
struct module *owner;
|
|
unsigned char name[W1_MAXNAMELEN];
|
|
/* list_mutex protects just slist and async_list so slaves can be
|
|
* searched for and async commands added while the master has
|
|
* w1_master.mutex locked and is operating on the bus.
|
|
* lock order w1_mlock, w1_master.mutex, w1_master.list_mutex
|
|
*/
|
|
struct mutex list_mutex;
|
|
struct list_head slist;
|
|
struct list_head async_list;
|
|
int max_slave_count, slave_count;
|
|
unsigned long attempts;
|
|
int slave_ttl;
|
|
int initialized;
|
|
u32 id;
|
|
int search_count;
|
|
/* id to start searching on, to continue a search or 0 to restart */
|
|
u64 search_id;
|
|
|
|
atomic_t refcnt;
|
|
|
|
void *priv;
|
|
|
|
/** 5V strong pullup enabled flag, 1 enabled, zero disabled. */
|
|
int enable_pullup;
|
|
/** 5V strong pullup duration in milliseconds, zero disabled. */
|
|
int pullup_duration;
|
|
|
|
long flags;
|
|
|
|
struct task_struct *thread;
|
|
struct mutex mutex;
|
|
struct mutex bus_mutex;
|
|
|
|
struct device_driver *driver;
|
|
struct device dev;
|
|
|
|
struct w1_bus_master *bus_master;
|
|
|
|
u32 seq;
|
|
};
|
|
|
|
/**
|
|
* struct w1_async_cmd - execute callback from the w1_process kthread
|
|
* @async_entry: link entry
|
|
* @cb: callback function, must list_del and destroy this list before
|
|
* returning
|
|
*
|
|
* When inserted into the w1_master async_list, w1_process will execute
|
|
* the callback. Embed this into the structure with the command details.
|
|
*/
|
|
struct w1_async_cmd {
|
|
struct list_head async_entry;
|
|
void (*cb)(struct w1_master *dev, struct w1_async_cmd *async_cmd);
|
|
};
|
|
|
|
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);
|
|
/* call w1_unref_slave to release the reference counts w1_search_slave added */
|
|
struct w1_slave *w1_search_slave(struct w1_reg_num *id);
|
|
/* decrements the reference on sl->master and sl, and cleans up if zero
|
|
* returns the reference count after it has been decremented */
|
|
int w1_unref_slave(struct w1_slave *sl);
|
|
void w1_slave_found(struct w1_master *dev, u64 rn);
|
|
void w1_search_process_cb(struct w1_master *dev, u8 search_type,
|
|
w1_slave_found_callback cb);
|
|
struct w1_slave *w1_slave_search_device(struct w1_master *dev,
|
|
struct w1_reg_num *rn);
|
|
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);
|
|
int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn);
|
|
/* 0 success, otherwise EBUSY */
|
|
int 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);
|
|
int w1_reset_resume_command(struct w1_master *);
|
|
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_callbacks(struct w1_master *dev);
|
|
extern int w1_process(void *);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __W1_H */
|