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/* $OpenBSD: i2c_io.h,v 1.1 2004/05/23 17:33:43 grange Exp $ */
/* $NetBSD: i2c_io.h,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _DEV_I2C_I2C_IO_H_
#define _DEV_I2C_I2C_IO_H_
#include <sys/ioccom.h>
/* I2C bus address. */
typedef uint16_t i2c_addr_t;
/* High-level I2C operations. */
typedef enum {
I2C_OP_READ = 0,
I2C_OP_READ_WITH_STOP = 1,
I2C_OP_WRITE = 2,
I2C_OP_WRITE_WITH_STOP = 3,
} i2c_op_t;
#define I2C_OP_READ_P(x) (((int)(x) & 2) == 0)
#define I2C_OP_WRITE_P(x) (! I2C_OP_READ_P(x))
#define I2C_OP_STOP_P(x) (((int)(x) & 1) != 0)
/*
* This structure describes a single I2C control script fragment.
*
* Note that use of this scripted API allows for support of automated
* SMBus controllers. The following table maps SMBus operations to
* script fragment configuration:
*
* SMBus "write byte": I2C_OP_WRITE_WITH_STOP
* cmdlen = 1
*
* SMBus "read byte": I2C_OP_READ_WITH_STOP
* cmdlen = 1
*
* SMBus "receive byte": I2C_OP_READ_WITH_STOP
* cmdlen = 0
*
* Note that while each of these 3 SMBus operations implies a STOP
* (which an automated controller will likely perform automatically),
* non-SMBus clients may continue to function even if they issue
* I2C_OP_WRITE and I2C_OP_READ.
*/
#ifdef notyet
/*
* I2C_IOCTL_EXEC:
*
* User ioctl to execute an i2c operation.
*/
typedef struct i2c_ioctl_exec {
i2c_op_t iie_op; /* operation to perform */
i2c_addr_t iie_addr; /* address of device */
const void *iie_cmd; /* pointer to command */
size_t iie_cmdlen; /* length of command */
void *iie_buf; /* pointer to data buffer */
size_t iie_buflen; /* length of data buffer */
} i2c_ioctl_exec_t;
#define I2C_EXEC_MAX_CMDLEN 32
#define I2C_EXEC_MAX_BUFLEN 32
#define I2C_IOCTL_EXEC _IOW('I', 0, i2c_ioctl_exec_t)
#endif
#endif /* _DEV_I2C_I2C_IO_H_ */
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