/*    i2c-dev.h - i2c-bus driver, char device interface    Copyright (C) 1995-97 Simon G. Vogl    Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>    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., 675 Mass Ave, Cambridge, MA 02139, USA.*/#ifndef LIB_I2CDEV_H#define LIB_I2CDEV_H#include <linux/types.h>#include <sys/ioctl.h>/* -- i2c.h -- *//* * I2C Message - used for pure i2c transaction, also from /dev interface */struct i2c_msg {	__u16 addr;	/* slave address			*/	unsigned short flags;		#define I2C_M_TEN	0x10	/* we have a ten bit chip address	*/#define I2C_M_RD	0x01#define I2C_M_NOSTART	0x4000#define I2C_M_REV_DIR_ADDR	0x2000#define I2C_M_IGNORE_NAK	0x1000#define I2C_M_NO_RD_ACK		0x0800	short len;		/* msg length				*/	char *buf;		/* pointer to msg data			*/	int err;	short done;};/* To determine what functionality is present */#define I2C_FUNC_I2C			0x00000001#define I2C_FUNC_10BIT_ADDR		0x00000002#define I2C_FUNC_PROTOCOL_MANGLING	0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */#define I2C_FUNC_SMBUS_HWPEC_CALC	0x00000008 /* SMBus 2.0 */#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC  0x00000800 /* SMBus 2.0 */ #define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */ #define I2C_FUNC_SMBUS_PROC_CALL_PEC	0x00002000 /* SMBus 2.0 */#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL	0x00008000 /* SMBus 2.0 */#define I2C_FUNC_SMBUS_QUICK		0x00010000 #define I2C_FUNC_SMBUS_READ_BYTE	0x00020000 #define I2C_FUNC_SMBUS_WRITE_BYTE	0x00040000 #define I2C_FUNC_SMBUS_READ_BYTE_DATA	0x00080000 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA	0x00100000 #define I2C_FUNC_SMBUS_READ_WORD_DATA	0x00200000 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA	0x00400000 #define I2C_FUNC_SMBUS_PROC_CALL	0x00800000 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA	0x01000000 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK	0x04000000 /* I2C-like block xfer  */#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK	0x08000000 /* w/ 1-byte reg. addr. */#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2	 0x10000000 /* I2C-like block xfer  */#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC  0x40000000 /* SMBus 2.0 */#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE | \                            I2C_FUNC_SMBUS_WRITE_BYTE#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA | \                                 I2C_FUNC_SMBUS_WRITE_BYTE_DATA#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA | \                                 I2C_FUNC_SMBUS_WRITE_WORD_DATA#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA | \                                  I2C_FUNC_SMBUS_WRITE_BLOCK_DATA#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK | \                                  I2C_FUNC_SMBUS_WRITE_I2C_BLOCK#define I2C_FUNC_SMBUS_I2C_BLOCK_2 I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \                                   I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2#define I2C_FUNC_SMBUS_BLOCK_DATA_PEC I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC | \                                      I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC#define I2C_FUNC_SMBUS_WORD_DATA_PEC  I2C_FUNC_SMBUS_READ_WORD_DATA_PEC | \                                      I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC#define I2C_FUNC_SMBUS_READ_BYTE_PEC		I2C_FUNC_SMBUS_READ_BYTE_DATA#define I2C_FUNC_SMBUS_WRITE_BYTE_PEC		I2C_FUNC_SMBUS_WRITE_BYTE_DATA#define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC	I2C_FUNC_SMBUS_READ_WORD_DATA#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC	I2C_FUNC_SMBUS_WRITE_WORD_DATA#define I2C_FUNC_SMBUS_BYTE_PEC			I2C_FUNC_SMBUS_BYTE_DATA#define I2C_FUNC_SMBUS_BYTE_DATA_PEC		I2C_FUNC_SMBUS_WORD_DATA#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK | \                            I2C_FUNC_SMBUS_BYTE | \                            I2C_FUNC_SMBUS_BYTE_DATA | \                            I2C_FUNC_SMBUS_WORD_DATA | \                            I2C_FUNC_SMBUS_PROC_CALL | \                            I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \                            I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC | \                            I2C_FUNC_SMBUS_I2C_BLOCK/*  * Data for SMBus Messages  */#define I2C_SMBUS_BLOCK_MAX	32	/* As specified in SMBus standard */	#define I2C_SMBUS_I2C_BLOCK_MAX	32	/* Not specified but we use same structure */union i2c_smbus_data {	__u8 byte;	__u16 word;	__u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */                          /* one more for read length in block process call */	                                            /* and one more for PEC */};/* smbus_access read or write markers */#define I2C_SMBUS_READ	1#define I2C_SMBUS_WRITE	0/* SMBus transaction types (size parameter in the above functions)    Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */#define I2C_SMBUS_QUICK		    0#define I2C_SMBUS_BYTE		    1#define I2C_SMBUS_BYTE_DATA	    2 #define I2C_SMBUS_WORD_DATA	    3#define I2C_SMBUS_PROC_CALL	    4#define I2C_SMBUS_BLOCK_DATA	    5#define I2C_SMBUS_I2C_BLOCK_DATA    6#define I2C_SMBUS_BLOCK_PROC_CALL   7		/* SMBus 2.0 */#define I2C_SMBUS_BLOCK_DATA_PEC    8		/* SMBus 2.0 */#define I2C_SMBUS_PROC_CALL_PEC     9		/* SMBus 2.0 */#define I2C_SMBUS_BLOCK_PROC_CALL_PEC  10	/* SMBus 2.0 */#define I2C_SMBUS_WORD_DATA_PEC	   11		/* SMBus 2.0 *//* ----- commands for the ioctl like i2c_command call: * note that additional calls are defined in the algorithm and hw  *	dependent layers - these can be listed here, or see the  *	corresponding header files. */				/* -> bit-adapter specific ioctls	*/#define I2C_RETRIES	0x0701	/* number of times a device address      */				/* should be polled when not            */                                /* acknowledging 			*/#define I2C_TIMEOUT	0x0702	/* set timeout - call with int 		*//* this is for i2c-dev.c	*/#define I2C_SLAVE	0x0703	/* Change slave address			*/				/* Attn.: Slave address is 7 or 10 bits */#define I2C_SLAVE_FORCE	0x0706	/* Change slave address			*/				/* Attn.: Slave address is 7 or 10 bits */				/* This changes the address, even if it */				/* is already taken!			*/#define I2C_TENBIT	0x0704	/* 0 for 7 bit addrs, != 0 for 10 bit	*/#define I2C_FUNCS	0x0705	/* Get the adapter functionality */#define I2C_RDWR	0x0707	/* Combined R/W transfer (one stop only)*/#define I2C_PEC		0x0708	/* != 0 for SMBus PEC                   */#if 0#define I2C_ACK_TEST	0x0710	/* See if a slave is at a specific address */#endif#define I2C_SMBUS	0x0720	/* SMBus-level access *//* -- i2c.h -- *//* Note: 10-bit addresses are NOT supported! *//* This is the structure as used in the I2C_SMBUS ioctl call */struct i2c_smbus_ioctl_data {	char read_write;	__u8 command;	int size;	union i2c_smbus_data *data;};/* This is the structure as used in the I2C_RDWR ioctl call */struct i2c_rdwr_ioctl_data {	struct i2c_msg *msgs;	/* pointers to i2c_msgs */	int nmsgs;		/* number of i2c_msgs */};static inline __s32 i2c_smbus_access(int file, char read_write, __u8 command,                                      int size, union i2c_smbus_data *data){	struct i2c_smbus_ioctl_data args;	args.read_write = read_write;	args.command = command;	args.size = size;	args.data = data;	return ioctl(file,I2C_SMBUS,&args);}static inline __s32 i2c_smbus_write_quick(int file, __u8 value){	return i2c_smbus_access(file,value,0,I2C_SMBUS_QUICK,NULL);}	static inline __s32 i2c_smbus_read_byte(int file){	union i2c_smbus_data data;	if (i2c_smbus_access(file,I2C_SMBUS_READ,0,I2C_SMBUS_BYTE,&data))		return -1;	else		return 0x0FF & data.byte;}static inline __s32 i2c_smbus_write_byte(int file, __u8 value){	return i2c_smbus_access(file,I2C_SMBUS_WRITE,value,	                        I2C_SMBUS_BYTE,NULL);}static inline __s32 i2c_smbus_read_byte_data(int file, __u8 command){	union i2c_smbus_data data;	if (i2c_smbus_access(file,I2C_SMBUS_READ,command,	                     I2C_SMBUS_BYTE_DATA,&data))		return -1;	else		return 0x0FF & data.byte;}static inline __s32 i2c_smbus_write_byte_data(int file, __u8 command,                                               __u8 value){	union i2c_smbus_data data;	data.byte = value;	return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,	                        I2C_SMBUS_BYTE_DATA, &data);}static inline __s32 i2c_smbus_read_word_data(int file, __u8 command){	union i2c_smbus_data data;	if (i2c_smbus_access(file,I2C_SMBUS_READ,command,	                     I2C_SMBUS_WORD_DATA,&data))		return -1;	else		return 0x0FFFF & data.word;}static inline __s32 i2c_smbus_write_word_data(int file, __u8 command,                                               __u16 value){	union i2c_smbus_data data;	data.word = value;	return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,	                        I2C_SMBUS_WORD_DATA, &data);}static inline __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value){	union i2c_smbus_data data;	data.word = value;	if (i2c_smbus_access(file,I2C_SMBUS_WRITE,command,	                     I2C_SMBUS_PROC_CALL,&data))		return -1;	else		return 0x0FFFF & data.word;}/* Returns the number of read bytes */static inline __s32 i2c_smbus_read_block_data(int file, __u8 command,                                               __u8 *values){	union i2c_smbus_data data;	int i;	if (i2c_smbus_access(file,I2C_SMBUS_READ,command,	                     I2C_SMBUS_BLOCK_DATA,&data))		return -1;	else {		for (i = 1; i <= data.block[0]; i++)			values[i-1] = data.block[i];		return data.block[0];	}}static inline __s32 i2c_smbus_write_block_data(int file, __u8 command,                                                __u8 length, __u8 *values){	union i2c_smbus_data data;	int i;	if (length > 32)		length = 32;	for (i = 1; i <= length; i++)		data.block[i] = values[i-1];	data.block[0] = length;	return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,	                        I2C_SMBUS_BLOCK_DATA, &data);}/* Returns the number of read bytes */static inline __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command,                                                  __u8 *values){	union i2c_smbus_data data;	int i;	if (i2c_smbus_access(file,I2C_SMBUS_READ,command,	                      I2C_SMBUS_I2C_BLOCK_DATA,&data))		return -1;	else {		for (i = 1; i <= data.block[0]; i++)			values[i-1] = data.block[i];		return data.block[0];	}}static inline __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command,                                               __u8 length, __u8 *values){	union i2c_smbus_data data;	int i;	if (length > 32)		length = 32;	for (i = 1; i <= length; i++)		data.block[i] = values[i-1];	data.block[0] = length;	return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,	                        I2C_SMBUS_I2C_BLOCK_DATA, &data);}/* Returns the number of read bytes */static inline __s32 i2c_smbus_block_process_call(int file, __u8 command,                                                 __u8 length, __u8 *values){	union i2c_smbus_data data;	int i;	if (length > 32)		length = 32;	for (i = 1; i <= length; i++)		data.block[i] = values[i-1];	data.block[0] = length;	if (i2c_smbus_access(file,I2C_SMBUS_WRITE,command,	                     I2C_SMBUS_BLOCK_PROC_CALL,&data))		return -1;	else {		for (i = 1; i <= data.block[0]; i++)			values[i-1] = data.block[i];		return data.block[0];	}}#endif /* LIB_I2CDEV_H */