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341 lines
10 KiB
341 lines
10 KiB
/* |
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* w1.h |
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* |
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* Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
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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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/** |
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* struct w1_reg_num - broken out slave device id |
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* |
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* @family: identifies the type of device |
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* @id: along with family is the unique device id |
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* @crc: checksum of the other bytes |
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*/ |
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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_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_RESUME_CMD 0xA5 |
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#define W1_SLAVE_ACTIVE 0 |
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#define W1_SLAVE_DETACH 1 |
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/** |
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* struct w1_slave - holds a single slave device on the bus |
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* |
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* @owner: Points to the one wire "wire" kernel module. |
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* @name: Device id is ascii. |
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* @w1_slave_entry: data for the linked list |
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* @reg_num: the slave id in binary |
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* @refcnt: reference count, delete when 0 |
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* @flags: bit flags for W1_SLAVE_ACTIVE W1_SLAVE_DETACH |
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* @ttl: decrement per search this slave isn't found, deatch at 0 |
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* @master: bus which this slave is on |
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* @family: module for device family type |
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* @family_data: pointer for use by the family module |
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* @dev: kernel device identifier |
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* |
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*/ |
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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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int ttl; |
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unsigned long flags; |
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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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}; |
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typedef void (*w1_slave_found_callback)(struct w1_master *, u64); |
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/** |
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* struct w1_bus_master - operations available on a bus master |
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* |
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* @data: the first parameter in all the functions below |
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* |
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* @read_bit: Sample the line level @return the level read (0 or 1) |
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* |
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* @write_bit: Sets the line level |
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* |
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* @touch_bit: the lowest-level function for devices that really support the |
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* 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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* @read_byte: 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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* @write_byte: Writes a byte. Same as 8 touch_bit(x) calls. |
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* |
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* @read_block: 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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* @write_block: Same as a series of write_byte() calls |
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* |
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* @triplet: 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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* @reset_bus: 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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* @set_pullup: 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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* @search: 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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* u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH |
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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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*/ |
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struct w1_bus_master |
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{ |
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void *data; |
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u8 (*read_bit)(void *); |
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void (*write_bit)(void *, u8); |
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u8 (*touch_bit)(void *, u8); |
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u8 (*read_byte)(void *); |
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void (*write_byte)(void *, u8); |
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u8 (*read_block)(void *, u8 *, int); |
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void (*write_block)(void *, const u8 *, int); |
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u8 (*triplet)(void *, u8); |
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u8 (*reset_bus)(void *); |
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u8 (*set_pullup)(void *, int); |
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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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/** |
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* enum w1_master_flags - bitfields used in w1_master.flags |
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* @W1_ABORT_SEARCH: abort searching early on shutdown |
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* @W1_WARN_MAX_COUNT: limit warning when the maximum count is reached |
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*/ |
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enum w1_master_flags { |
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W1_ABORT_SEARCH = 0, |
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W1_WARN_MAX_COUNT = 1, |
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}; |
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/** |
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* struct w1_master - one per bus master |
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* @w1_master_entry: master linked list |
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* @owner: module owner |
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* @name: dynamically allocate bus name |
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* @list_mutex: protect slist and async_list |
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* @slist: linked list of slaves |
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* @async_list: linked list of netlink commands to execute |
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* @max_slave_count: maximum number of slaves to search for at a time |
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* @slave_count: current number of slaves known |
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* @attempts: number of searches ran |
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* @slave_ttl: number of searches before a slave is timed out |
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* @initialized: prevent init/removal race conditions |
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* @id: w1 bus number |
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* @search_count: number of automatic searches to run, -1 unlimited |
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* @search_id: allows continuing a search |
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* @refcnt: reference count |
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* @priv: private data storage |
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* @enable_pullup: allows a strong pullup |
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* @pullup_duration: time for the next strong pullup |
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* @flags: one of w1_master_flags |
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* @thread: thread for bus search and netlink commands |
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* @mutex: protect most of w1_master |
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* @bus_mutex: pretect concurrent bus access |
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* @driver: sysfs driver |
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* @dev: sysfs device |
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* @bus_master: io operations available |
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* @seq: sequence number used for netlink broadcasts |
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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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/* list_mutex protects just slist and async_list so slaves can be |
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* searched for and async commands added while the master has |
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* w1_master.mutex locked and is operating on the bus. |
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* lock order w1_mlock, w1_master.mutex, w1_master.list_mutex |
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*/ |
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struct mutex list_mutex; |
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struct list_head slist; |
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struct list_head async_list; |
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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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/* id to start searching on, to continue a search or 0 to restart */ |
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u64 search_id; |
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atomic_t refcnt; |
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void *priv; |
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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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long flags; |
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struct task_struct *thread; |
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struct mutex mutex; |
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struct mutex bus_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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/** |
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* struct w1_async_cmd - execute callback from the w1_process kthread |
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* @async_entry: link entry |
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* @cb: callback function, must list_del and destroy this list before |
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* returning |
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* |
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* When inserted into the w1_master async_list, w1_process will execute |
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* the callback. Embed this into the structure with the command details. |
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*/ |
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struct w1_async_cmd { |
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struct list_head async_entry; |
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void (*cb)(struct w1_master *dev, struct w1_async_cmd *async_cmd); |
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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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/* call w1_unref_slave to release the reference counts w1_search_slave added */ |
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struct w1_slave *w1_search_slave(struct w1_reg_num *id); |
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/* decrements the reference on sl->master and sl, and cleans up if zero |
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* returns the reference count after it has been decremented */ |
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int w1_unref_slave(struct w1_slave *sl); |
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void w1_slave_found(struct w1_master *dev, u64 rn); |
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void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
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w1_slave_found_callback cb); |
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struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
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struct w1_reg_num *rn); |
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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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int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn); |
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/* 0 success, otherwise EBUSY */ |
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int 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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u8 w1_read_8(struct w1_master *); |
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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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void w1_touch_block(struct w1_master *, 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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int w1_reset_resume_command(struct w1_master *); |
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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_callbacks(struct w1_master *dev); |
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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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