437177b028
128 byte reads are much more common than 32 byte reads. The message passing + setup/teardown for a read is much more expensive, in terms of time, than the reading itself. A slightly bigger struct is well worth the time savings. This reduces read times for /dev/eeprom from 57 seconds per 4KB to 14 seconds. Additionally, make sending the page address in the eeprom driver and utility optional. This can save a little time when reading within the same page and allows support for smaller devices that don't support pages (example: chips containing EDID). Change-Id: Ie48087caee40c11fa241d1555fce9309ddd27b43
107 lines
3.9 KiB
C
107 lines
3.9 KiB
C
/* $NetBSD: i2c_io.h,v 1.3 2012/04/22 14:10:36 pgoyette Exp $ */
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/*
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* Copyright (c) 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _DEV_I2C_I2C_IO_H_
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#define _DEV_I2C_I2C_IO_H_
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#include <sys/ioccom.h>
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/* I2C bus address. */
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typedef uint16_t i2c_addr_t;
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/* High-level I2C operations. */
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#define I2C_OPMASK_STOP 1
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#define I2C_OPMASK_WRITE 2
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#define I2C_OPMASK_BLKMODE 4
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#define I2C_OP_STOP_P(x) (((int)(x) & I2C_OPMASK_STOP) != 0)
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#define I2C_OP_WRITE_P(x) (((int)(x) & I2C_OPMASK_WRITE) != 0)
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#define I2C_OP_READ_P(x) (!I2C_OP_WRITE_P(x))
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#define I2C_OP_BLKMODE_P(x) (((int)(x) & I2C_OPMASK_BLKMODE) != 0)
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typedef enum {
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I2C_OP_READ = 0,
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I2C_OP_READ_WITH_STOP = I2C_OPMASK_STOP,
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I2C_OP_WRITE = I2C_OPMASK_WRITE,
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I2C_OP_WRITE_WITH_STOP = I2C_OPMASK_WRITE | I2C_OPMASK_STOP,
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I2C_OP_READ_BLOCK = I2C_OPMASK_BLKMODE | I2C_OPMASK_STOP,
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I2C_OP_WRITE_BLOCK = I2C_OPMASK_BLKMODE | I2C_OPMASK_WRITE |
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I2C_OPMASK_STOP,
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} i2c_op_t;
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/*
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* This structure describes a single I2C control script fragment.
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*
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* Note that use of this scripted API allows for support of automated
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* SMBus controllers. The following table maps SMBus operations to
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* script fragment configuration:
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*
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* SMBus "write byte": I2C_OP_WRITE_WITH_STOP
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* cmdlen = 1
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*
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* SMBus "read byte": I2C_OP_READ_WITH_STOP
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* cmdlen = 1
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*
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* SMBus "receive byte": I2C_OP_READ_WITH_STOP
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* cmdlen = 0
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*
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* Note that while each of these 3 SMBus operations implies a STOP
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* (which an automated controller will likely perform automatically),
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* non-SMBus clients may continue to function even if they issue
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* I2C_OP_WRITE and I2C_OP_READ.
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*/
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/*
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* I2C_IOCTL_EXEC:
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*
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* User ioctl to execute an i2c operation.
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*/
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typedef struct i2c_ioctl_exec {
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i2c_op_t iie_op; /* operation to perform */
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i2c_addr_t iie_addr; /* address of device */
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const void *iie_cmd; /* pointer to command */
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size_t iie_cmdlen; /* length of command */
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void *iie_buf; /* pointer to data buffer */
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size_t iie_buflen; /* length of data buffer */
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} i2c_ioctl_exec_t;
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#define I2C_EXEC_MAX_CMDLEN 128
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#define I2C_EXEC_MAX_BUFLEN 128
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#define I2C_IOCTL_EXEC _IOW('I', 0, i2c_ioctl_exec_t)
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#endif /* _DEV_I2C_I2C_IO_H_ */
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