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/* $OpenBSD: i2cvar.h,v 1.6 2005/12/27 17:18:18 deraadt Exp $ */
/* $NetBSD: i2cvar.h,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Steve C. Woodford and 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_I2CVAR_H_
#define _DEV_I2C_I2CVAR_H_
#include <dev/i2c/i2c_io.h>
/* Flags passed to i2c routines. */
#define I2C_F_WRITE 0x00 /* new transfer is a write */
#define I2C_F_READ 0x01 /* new transfer is a read */
#define I2C_F_LAST 0x02 /* last byte of read */
#define I2C_F_STOP 0x04 /* send stop after byte */
#define I2C_F_POLL 0x08 /* poll, don't sleep */
/*
* This structure provides the interface between the i2c framework
* and the underlying i2c controller.
*
* Note that this structure is designed specifically to allow us
* to either use the autoconfiguration framework or not. This
* allows a driver for a board with a private i2c bus use generic
* i2c client drivers for chips that might be on that board.
*/
typedef struct i2c_controller {
void *ic_cookie; /* controller private */
/*
* These provide synchronization in the presence of
* multiple users of the i2c bus. When a device
* driver wishes to perform transfers on the i2c
* bus, the driver should acquire the bus. When
* the driver is finished, it should release the
* bus.
*
* This is provided by the back-end since a single
* controller may present e.g. i2c and smbus views
* of the same set of i2c wires.
*/
int (*ic_acquire_bus)(void *, int);
void (*ic_release_bus)(void *, int);
/*
* The preferred API for clients of the i2c interface
* is the scripted API. This handles i2c controllers
* that do not provide raw access to the i2c signals.
*/
int (*ic_exec)(void *, i2c_op_t, i2c_addr_t, const void *, size_t,
void *, size_t, int);
int (*ic_send_start)(void *, int);
int (*ic_send_stop)(void *, int);
int (*ic_initiate_xfer)(void *, i2c_addr_t, int);
int (*ic_read_byte)(void *, uint8_t *, int);
int (*ic_write_byte)(void *, uint8_t, int);
} *i2c_tag_t;
/* Used to attach the i2c framework to the controller. */
struct i2cbus_attach_args {
const char *iba_name; /* bus name ("iic") */
i2c_tag_t iba_tag; /* the controller */
int iba_scan; /* do bus scanning */
};
/* Used to attach devices on the i2c bus. */
struct i2c_attach_args {
i2c_tag_t ia_tag; /* our controller */
i2c_addr_t ia_addr; /* address of device */
int ia_size; /* size (for EEPROMs) */
char *ia_name;
};
/*
* API presented to i2c controllers.
*/
int iicbus_print(void *, const char *);
#ifdef _I2C_PRIVATE
/*
* Macros used internally by the i2c framework.
*/
#define iic_send_start(ic, flags) \
(*(ic)->ic_send_start)((ic)->ic_cookie, (flags))
#define iic_send_stop(ic, flags) \
(*(ic)->ic_send_stop)((ic)->ic_cookie, (flags))
#define iic_initiate_xfer(ic, addr, flags) \
(*(ic)->ic_initiate_xfer)((ic)->ic_cookie, (addr), (flags))
#define iic_read_byte(ic, bytep, flags) \
(*(ic)->ic_read_byte)((ic)->ic_cookie, (bytep), (flags))
#define iic_write_byte(ic, byte, flags) \
(*(ic)->ic_write_byte)((ic)->ic_cookie, (byte), (flags))
void iic_scan(struct device *, struct i2cbus_attach_args *);
int iic_print(void *, const char *);
#endif /* _I2C_PRIVATE */
/*
* Simplified API for clients of the i2c framework. Definitions
* in <dev/i2c/i2c_io.h>.
*/
#define iic_acquire_bus(ic, flags) \
(*(ic)->ic_acquire_bus)((ic)->ic_cookie, (flags))
#define iic_release_bus(ic, flags) \
(*(ic)->ic_release_bus)((ic)->ic_cookie, (flags))
int iic_exec(i2c_tag_t, i2c_op_t, i2c_addr_t, const void *,
size_t, void *, size_t, int);
int iic_smbus_write_byte(i2c_tag_t, i2c_addr_t, uint8_t, uint8_t, int);
int iic_smbus_read_byte(i2c_tag_t, i2c_addr_t, uint8_t, uint8_t *, int);
int iic_smbus_receive_byte(i2c_tag_t, i2c_addr_t, uint8_t *, int);
#endif /* _DEV_I2C_I2CVAR_H_ */
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