include/linux/w1.h - arm/linux - Git at Google

 /*
  * 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 __LINUX_W1_H
 #define __LINUX_W1_H

 #include <linux/device.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__

 #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

 /**
  * 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
  * @hwmon: pointer to hwmon device
  *
  */
 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;
 	struct device		*hwmon;
 };

 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;
 };

 int w1_add_master_device(struct w1_bus_master *master);
 void w1_remove_master_device(struct w1_bus_master *master);

 /**
  * struct w1_family_ops - operations for a family type
  * @add_slave: add_slave
  * @remove_slave: remove_slave
  * @groups: sysfs group
  * @chip_info: pointer to struct hwmon_chip_info
  */
 struct w1_family_ops {
 	int  (*add_slave)(struct w1_slave *sl);
 	void (*remove_slave)(struct w1_slave *sl);
 	const struct attribute_group **groups;
 	const struct hwmon_chip_info *chip_info;
 };

 /**
  * struct w1_family - reference counted family structure.
  * @family_entry:	family linked list
  * @fid:		8 bit family identifier
  * @fops:		operations for this family
  * @refcnt:		reference counter
  */
 struct w1_family {
 	struct list_head	family_entry;
 	u8			fid;

 	struct w1_family_ops	*fops;

 	atomic_t		refcnt;
 };

 int w1_register_family(struct w1_family *family);
 void w1_unregister_family(struct w1_family *family);

 /**
  * module_w1_driver() - Helper macro for registering a 1-Wire families
  * @__w1_family: w1_family struct
  *
  * Helper macro for 1-Wire families which do not do anything special in module
  * init/exit. This eliminates a lot of boilerplate. Each module may only
  * use this macro once, and calling it replaces module_init() and module_exit()
  */
 #define module_w1_family(__w1_family) \
 	module_driver(__w1_family, w1_register_family, \
 			w1_unregister_family)

 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);
 }

 #endif /* __KERNEL__ */

 #endif /* __LINUX_W1_H */
	/*
	* 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 __LINUX_W1_H
	#define __LINUX_W1_H

	#include <linux/device.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__

	#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

	/**
	* 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
	* @hwmon: pointer to hwmon device
	*
	*/
	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;
	struct device *hwmon;
	};

	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;
	};

	int w1_add_master_device(struct w1_bus_master *master);
	void w1_remove_master_device(struct w1_bus_master *master);

	/**
	* struct w1_family_ops - operations for a family type
	* @add_slave: add_slave
	* @remove_slave: remove_slave
	* @groups: sysfs group
	* @chip_info: pointer to struct hwmon_chip_info
	*/
	struct w1_family_ops {
	int (add_slave)(struct w1_slave sl);
	void (remove_slave)(struct w1_slave sl);
	const struct attribute_group **groups;
	const struct hwmon_chip_info *chip_info;
	};

	/**
	* struct w1_family - reference counted family structure.
	* @family_entry: family linked list
	* @fid: 8 bit family identifier
	* @fops: operations for this family
	* @refcnt: reference counter
	*/
	struct w1_family {
	struct list_head family_entry;
	u8 fid;

	struct w1_family_ops *fops;

	atomic_t refcnt;
	};

	int w1_register_family(struct w1_family *family);
	void w1_unregister_family(struct w1_family *family);

	/**
	* module_w1_driver() - Helper macro for registering a 1-Wire families
	* @__w1_family: w1_family struct
	*
	* Helper macro for 1-Wire families which do not do anything special in module
	* init/exit. This eliminates a lot of boilerplate. Each module may only
	* use this macro once, and calling it replaces module_init() and module_exit()
	*/
	#define module_w1_family(__w1_family) \
	module_driver(__w1_family, w1_register_family, \
	w1_unregister_family)

	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);
	}

	#endif /* __KERNEL__ */

	#endif /* __LINUX_W1_H */