/* * 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 */