144 lines
5.3 KiB
C
144 lines
5.3 KiB
C
/* $NetBSD: i2cvar.h,v 1.2 2005/12/11 12:21:22 christos 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 */
|
|
};
|
|
|
|
/* 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) */
|
|
};
|
|
|
|
/*
|
|
* 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))
|
|
#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_ */
|