include/uapi/linux/i2c.h - kernel/lockdown - Git at Google

 /* ------------------------------------------------------------------------- */
 /*									     */
 /* i2c.h - definitions for the i2c-bus interface			     */
 /*									     */
 /* ------------------------------------------------------------------------- */
 /*   Copyright (C) 1995-2000 Simon G. Vogl

     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., 51 Franklin Street, Fifth Floor, Boston,
     MA 02110-1301 USA.							     */
 /* ------------------------------------------------------------------------- */

 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
    Frodo Looijaard <frodol@dds.nl> */

 #ifndef _UAPI_LINUX_I2C_H
 #define _UAPI_LINUX_I2C_H

 #include <linux/types.h>

 /**
  * struct i2c_msg - an I2C transaction segment beginning with START
  * @addr: Slave address, either seven or ten bits.  When this is a ten
  *	bit address, I2C_M_TEN must be set in @flags and the adapter
  *	must support I2C_FUNC_10BIT_ADDR.
  * @flags: I2C_M_RD is handled by all adapters.  No other flags may be
  *	provided unless the adapter exported the relevant I2C_FUNC_*
  *	flags through i2c_check_functionality().
  * @len: Number of data bytes in @buf being read from or written to the
  *	I2C slave address.  For read transactions where I2C_M_RECV_LEN
  *	is set, the caller guarantees that this buffer can hold up to
  *	32 bytes in addition to the initial length byte sent by the
  *	slave (plus, if used, the SMBus PEC); and this value will be
  *	incremented by the number of block data bytes received.
  * @buf: The buffer into which data is read, or from which it's written.
  *
  * An i2c_msg is the low level representation of one segment of an I2C
  * transaction.  It is visible to drivers in the @i2c_transfer() procedure,
  * to userspace from i2c-dev, and to I2C adapter drivers through the
  * @i2c_adapter.@master_xfer() method.
  *
  * Except when I2C "protocol mangling" is used, all I2C adapters implement
  * the standard rules for I2C transactions.  Each transaction begins with a
  * START.  That is followed by the slave address, and a bit encoding read
  * versus write.  Then follow all the data bytes, possibly including a byte
  * with SMBus PEC.  The transfer terminates with a NAK, or when all those
  * bytes have been transferred and ACKed.  If this is the last message in a
  * group, it is followed by a STOP.  Otherwise it is followed by the next
  * @i2c_msg transaction segment, beginning with a (repeated) START.
  *
  * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
  * passing certain @flags may have changed those standard protocol behaviors.
  * Those flags are only for use with broken/nonconforming slaves, and with
  * adapters which are known to support the specific mangling options they
  * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
  */
 struct i2c_msg {
 	__u16 addr;	/* slave address			*/
 	__u16 flags;
 #define I2C_M_TEN		0x0010	/* this is a ten bit chip address */
 #define I2C_M_RD		0x0001	/* read data, from slave to master */
 #define I2C_M_STOP		0x8000	/* if I2C_FUNC_PROTOCOL_MANGLING */
 #define I2C_M_NOSTART		0x4000	/* if I2C_FUNC_NOSTART */
 #define I2C_M_REV_DIR_ADDR	0x2000	/* if I2C_FUNC_PROTOCOL_MANGLING */
 #define I2C_M_IGNORE_NAK	0x1000	/* if I2C_FUNC_PROTOCOL_MANGLING */
 #define I2C_M_NO_RD_ACK		0x0800	/* if I2C_FUNC_PROTOCOL_MANGLING */
 #define I2C_M_RECV_LEN		0x0400	/* length will be first received byte */
 	__u16 len;		/* msg length				*/
 	__u8 *buf;		/* pointer to msg data			*/
 };

 /* 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_IGNORE_NAK etc. */
 #define I2C_FUNC_SMBUS_PEC		0x00000008
 #define I2C_FUNC_NOSTART		0x00000010 /* I2C_M_NOSTART */
 #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_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_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_I2C_BLOCK | \
 					 I2C_FUNC_SMBUS_PEC)

 /*
  * Data for SMBus Messages
  */
 #define I2C_SMBUS_BLOCK_MAX	32	/* As specified in SMBus standard */
 union i2c_smbus_data {
 	__u8 byte;
 	__u16 word;
 	__u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
 			       /* and one more for user-space compatibility */
 };

 /* i2c_smbus_xfer 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_BROKEN  6
 #define I2C_SMBUS_BLOCK_PROC_CALL   7		/* SMBus 2.0 */
 #define I2C_SMBUS_I2C_BLOCK_DATA    8

 #endif /* _UAPI_LINUX_I2C_H */
	/* ------------------------------------------------------------------------- */
	/* */
	/* i2c.h - definitions for the i2c-bus interface */
	/* */
	/* ------------------------------------------------------------------------- */
	/* Copyright (C) 1995-2000 Simon G. Vogl

	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., 51 Franklin Street, Fifth Floor, Boston,
	MA 02110-1301 USA. */
	/* ------------------------------------------------------------------------- */

	/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
	Frodo Looijaard <frodol@dds.nl> */

	#ifndef _UAPI_LINUX_I2C_H
	#define _UAPI_LINUX_I2C_H

	#include <linux/types.h>

	/**
	* struct i2c_msg - an I2C transaction segment beginning with START
	* @addr: Slave address, either seven or ten bits. When this is a ten
	* bit address, I2C_M_TEN must be set in @flags and the adapter
	* must support I2C_FUNC_10BIT_ADDR.
	* @flags: I2C_M_RD is handled by all adapters. No other flags may be
	* provided unless the adapter exported the relevant I2C_FUNC_*
	* flags through i2c_check_functionality().
	* @len: Number of data bytes in @buf being read from or written to the
	* I2C slave address. For read transactions where I2C_M_RECV_LEN
	* is set, the caller guarantees that this buffer can hold up to
	* 32 bytes in addition to the initial length byte sent by the
	* slave (plus, if used, the SMBus PEC); and this value will be
	* incremented by the number of block data bytes received.
	* @buf: The buffer into which data is read, or from which it's written.
	*
	* An i2c_msg is the low level representation of one segment of an I2C
	* transaction. It is visible to drivers in the @i2c_transfer() procedure,
	* to userspace from i2c-dev, and to I2C adapter drivers through the
	* @i2c_adapter.@master_xfer() method.
	*
	* Except when I2C "protocol mangling" is used, all I2C adapters implement
	* the standard rules for I2C transactions. Each transaction begins with a
	* START. That is followed by the slave address, and a bit encoding read
	* versus write. Then follow all the data bytes, possibly including a byte
	* with SMBus PEC. The transfer terminates with a NAK, or when all those
	* bytes have been transferred and ACKed. If this is the last message in a
	* group, it is followed by a STOP. Otherwise it is followed by the next
	* @i2c_msg transaction segment, beginning with a (repeated) START.
	*
	* Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
	* passing certain @flags may have changed those standard protocol behaviors.
	* Those flags are only for use with broken/nonconforming slaves, and with
	* adapters which are known to support the specific mangling options they
	* need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
	*/
	struct i2c_msg {
	__u16 addr; /* slave address */
	__u16 flags;
	#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
	#define I2C_M_RD 0x0001 /* read data, from slave to master */
	#define I2C_M_STOP 0x8000 /* if I2C_FUNC_PROTOCOL_MANGLING */
	#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_NOSTART */
	#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
	#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */
	#define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */
	#define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
	__u16 len; /* msg length */
	__u8 buf; / pointer to msg data */
	};

	/* 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_IGNORE_NAK etc. */
	#define I2C_FUNC_SMBUS_PEC 0x00000008
	#define I2C_FUNC_NOSTART 0x00000010 /* I2C_M_NOSTART */
	#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_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_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_I2C_BLOCK \| \
	I2C_FUNC_SMBUS_PEC)

	/*
	* Data for SMBus Messages
	*/
	#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
	union i2c_smbus_data {
	__u8 byte;
	__u16 word;
	__u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
	/* and one more for user-space compatibility */
	};

	/* i2c_smbus_xfer 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_BROKEN 6
	#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
	#define I2C_SMBUS_I2C_BLOCK_DATA 8

	#endif /* _UAPI_LINUX_I2C_H */