6a158c0de7
Add a strong pullup option to the w1 system. This supplies extra power for parasite powered devices. There is a w1_master_pullup sysfs entry and enable_pullup module parameter to enable or disable the strong pullup. The one wire bus requires at a minimum one wire and ground. The common wire is used for sending and receiving data as well as supplying power to devices that are parasite powered of which temperature sensors can be one example. The bus must be idle and left high while a temperature conversion is in progress, in addition the normal pullup resister on larger networks or even higher temperatures might not supply enough power. The pullup resister can't provide too much pullup current, because devices need to pull the bus down to write a value. This enables the strong pullup for supported hardware, which can supply more current when requested. Unsupported hardware will just delay with the bus high. The hardware USB 2490 one wire bus master has a bit on some commands which will enable the strong pullup as soon as the command finishes executing. To use strong pullup, call the new w1_next_pullup function to register the duration. The next write command will call set_pullup before sending the data, and reset the duration to zero once it returns. Switched from simple_strtol to strict_strtol. Signed-off-by: David Fries <david@fries.net> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
244 lines
6.2 KiB
C
244 lines
6.2 KiB
C
/*
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* w1.h
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*
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* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __W1_H
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#define __W1_H
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struct w1_reg_num
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{
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u64 family:8,
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id:48,
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crc:8;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u64 crc:8,
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id:48,
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family:8;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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};
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#ifdef __KERNEL__
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#include <linux/completion.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include "w1_family.h"
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#define W1_MAXNAMELEN 32
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#define W1_SLAVE_DATA_SIZE 128
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#define W1_SEARCH 0xF0
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#define W1_ALARM_SEARCH 0xEC
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#define W1_CONVERT_TEMP 0x44
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#define W1_SKIP_ROM 0xCC
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#define W1_READ_SCRATCHPAD 0xBE
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#define W1_READ_ROM 0x33
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#define W1_READ_PSUPPLY 0xB4
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#define W1_MATCH_ROM 0x55
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#define W1_SLAVE_ACTIVE 0
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struct w1_slave
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{
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struct module *owner;
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unsigned char name[W1_MAXNAMELEN];
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struct list_head w1_slave_entry;
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struct w1_reg_num reg_num;
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atomic_t refcnt;
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u8 rom[9];
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u32 flags;
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int ttl;
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struct w1_master *master;
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struct w1_family *family;
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void *family_data;
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struct device dev;
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struct completion released;
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};
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typedef void (*w1_slave_found_callback)(struct w1_master *, u64);
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/**
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* Note: read_bit and write_bit are very low level functions and should only
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* be used with hardware that doesn't really support 1-wire operations,
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* like a parallel/serial port.
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* Either define read_bit and write_bit OR define, at minimum, touch_bit and
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* reset_bus.
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*/
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struct w1_bus_master
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{
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/** the first parameter in all the functions below */
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void *data;
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/**
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* Sample the line level
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* @return the level read (0 or 1)
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*/
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u8 (*read_bit)(void *);
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/** Sets the line level */
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void (*write_bit)(void *, u8);
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/**
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* touch_bit is the lowest-level function for devices that really
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* support the 1-wire protocol.
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* touch_bit(0) = write-0 cycle
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* touch_bit(1) = write-1 / read cycle
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* @return the bit read (0 or 1)
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*/
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u8 (*touch_bit)(void *, u8);
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/**
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* Reads a bytes. Same as 8 touch_bit(1) calls.
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* @return the byte read
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*/
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u8 (*read_byte)(void *);
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/**
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* Writes a byte. Same as 8 touch_bit(x) calls.
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*/
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void (*write_byte)(void *, u8);
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/**
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* Same as a series of read_byte() calls
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* @return the number of bytes read
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*/
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u8 (*read_block)(void *, u8 *, int);
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/** Same as a series of write_byte() calls */
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void (*write_block)(void *, const u8 *, int);
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/**
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* Combines two reads and a smart write for ROM searches
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* @return bit0=Id bit1=comp_id bit2=dir_taken
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*/
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u8 (*triplet)(void *, u8);
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/**
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* long write-0 with a read for the presence pulse detection
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* @return -1=Error, 0=Device present, 1=No device present
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*/
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u8 (*reset_bus)(void *);
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/**
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* Put out a strong pull-up pulse of the specified duration.
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* @return -1=Error, 0=completed
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*/
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u8 (*set_pullup)(void *, int);
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/** Really nice hardware can handles the different types of ROM search
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* w1_master* is passed to the slave found callback.
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*/
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void (*search)(void *, struct w1_master *,
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u8, w1_slave_found_callback);
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};
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struct w1_master
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{
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struct list_head w1_master_entry;
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struct module *owner;
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unsigned char name[W1_MAXNAMELEN];
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struct list_head slist;
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int max_slave_count, slave_count;
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unsigned long attempts;
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int slave_ttl;
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int initialized;
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u32 id;
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int search_count;
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atomic_t refcnt;
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void *priv;
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int priv_size;
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/** 5V strong pullup enabled flag, 1 enabled, zero disabled. */
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int enable_pullup;
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/** 5V strong pullup duration in milliseconds, zero disabled. */
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int pullup_duration;
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struct task_struct *thread;
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struct mutex mutex;
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struct device_driver *driver;
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struct device dev;
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struct w1_bus_master *bus_master;
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u32 seq;
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};
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int w1_create_master_attributes(struct w1_master *);
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void w1_destroy_master_attributes(struct w1_master *master);
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void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
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void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
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struct w1_slave *w1_search_slave(struct w1_reg_num *id);
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void w1_search_process(struct w1_master *dev, u8 search_type);
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struct w1_master *w1_search_master_id(u32 id);
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/* Disconnect and reconnect devices in the given family. Used for finding
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* unclaimed devices after a family has been registered or releasing devices
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* after a family has been unregistered. Set attach to 1 when a new family
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* has just been registered, to 0 when it has been unregistered.
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*/
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void w1_reconnect_slaves(struct w1_family *f, int attach);
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void w1_slave_detach(struct w1_slave *sl);
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u8 w1_triplet(struct w1_master *dev, int bdir);
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void w1_write_8(struct w1_master *, u8);
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int w1_reset_bus(struct w1_master *);
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u8 w1_calc_crc8(u8 *, int);
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void w1_write_block(struct w1_master *, const u8 *, int);
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u8 w1_read_block(struct w1_master *, u8 *, int);
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int w1_reset_select_slave(struct w1_slave *sl);
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void w1_next_pullup(struct w1_master *, int);
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static inline struct w1_slave* dev_to_w1_slave(struct device *dev)
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{
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return container_of(dev, struct w1_slave, dev);
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}
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static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj)
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{
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return dev_to_w1_slave(container_of(kobj, struct device, kobj));
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}
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static inline struct w1_master* dev_to_w1_master(struct device *dev)
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{
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return container_of(dev, struct w1_master, dev);
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}
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extern struct device_driver w1_master_driver;
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extern struct device w1_master_device;
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extern int w1_max_slave_count;
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extern int w1_max_slave_ttl;
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extern struct list_head w1_masters;
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extern struct mutex w1_mlock;
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extern int w1_process(void *);
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#endif /* __KERNEL__ */
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#endif /* __W1_H */
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