d7fac9732b
forcing all transfers to do the start read/write stop by hand. Some smart bridges prefer this sort of operation, and this allows us to support their features more easily. When bridges don't support it, we fall back to using the old-style opertaions. Expand the ioctl interface to expose this function. Unlike the old-style interface, this interface is thread safe, even on old bridges.
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*-
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* Copyright (c) 1998 Nicolas Souchu
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef __IIC_H
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#define __IIC_H
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#include <sys/ioccom.h>
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/* Designed to be compatible with linux's struct i2c_msg */
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struct iic_msg
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{
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uint16_t slave;
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uint16_t flags;
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#define IIC_M_RD 0x0001 /* read vs write */
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uint16_t len; /* msg legnth */
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uint8_t * buf;
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};
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struct iiccmd {
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u_char slave;
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int count;
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int last;
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char *buf;
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};
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struct iic_rdwr_data {
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struct iic_msg *msgs;
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uint32_t nmsgs;
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};
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#define I2CSTART _IOW('i', 1, struct iiccmd) /* start condition */
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#define I2CSTOP _IO('i', 2) /* stop condition */
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#define I2CRSTCARD _IOW('i', 3, struct iiccmd) /* reset the card */
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#define I2CWRITE _IOW('i', 4, struct iiccmd) /* send data */
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#define I2CREAD _IOW('i', 5, struct iiccmd) /* receive data */
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#define I2CRDWR _IOW('i', 6, struct iic_rdwr_data) /* General read/write interface */
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#endif
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