| /* |
| * 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 <linux/mutex.h> |
| |
| #include "w1_family.h" |
| |
| #define W1_MAXNAMELEN 32 |
| #define W1_SLAVE_DATA_SIZE 128 |
| |
| #define W1_SEARCH 0xF0 |
| #define W1_ALARM_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 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)(struct w1_master *, 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 */ |
| void *data; |
| |
| /** |
| * Sample the line level |
| * @return the level read (0 or 1) |
| */ |
| u8 (*read_bit)(void *); |
| |
| /** Sets the line level */ |
| void (*write_bit)(void *, 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)(void *, u8); |
| |
| /** |
| * Reads a bytes. Same as 8 touch_bit(1) calls. |
| * @return the byte read |
| */ |
| u8 (*read_byte)(void *); |
| |
| /** |
| * Writes a byte. Same as 8 touch_bit(x) calls. |
| */ |
| void (*write_byte)(void *, u8); |
| |
| /** |
| * Same as a series of read_byte() calls |
| * @return the number of bytes read |
| */ |
| u8 (*read_block)(void *, u8 *, int); |
| |
| /** Same as a series of write_byte() calls */ |
| void (*write_block)(void *, const u8 *, int); |
| |
| /** |
| * Combines two reads and a smart write for ROM searches |
| * @return bit0=Id bit1=comp_id bit2=dir_taken |
| */ |
| u8 (*triplet)(void *, 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)(void *); |
| |
| /** Really nice hardware can handles the different types of ROM search |
| * w1_master* is passed to the slave found callback. |
| */ |
| void (*search)(void *, struct w1_master *, |
| u8, w1_slave_found_callback); |
| }; |
| |
| 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; |
| |
| struct task_struct *thread; |
| struct mutex mutex; |
| |
| struct device_driver *driver; |
| struct device dev; |
| |
| struct w1_bus_master *bus_master; |
| |
| u32 seq; |
| }; |
| |
| 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); |
| struct w1_slave *w1_search_slave(struct w1_reg_num *id); |
| void w1_search_process(struct w1_master *dev, u8 search_type); |
| 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); |
| void w1_slave_detach(struct w1_slave *sl); |
| |
| u8 w1_triplet(struct w1_master *dev, int bdir); |
| void w1_write_8(struct w1_master *, u8); |
| int w1_reset_bus(struct w1_master *); |
| u8 w1_calc_crc8(u8 *, int); |
| void w1_write_block(struct w1_master *, const u8 *, int); |
| u8 w1_read_block(struct w1_master *, u8 *, int); |
| int w1_reset_select_slave(struct w1_slave *sl); |
| |
| 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(void *); |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* __W1_H */ |