The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/at91_twiio.h

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    1 /*-
    2  * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   23  *
   24  * $FreeBSD: releng/6.3/sys/arm/at91/at91_twiio.h 159907 2006-06-23 23:35:36Z cognet $
   25  */
   26 
   27 #ifndef _ARM_AT91_AT91_TWIIO_H
   28 #define _ARM_AT91_AT91_TWIIO_H
   29 
   30 #include <sys/ioccom.h>
   31 
   32 struct at91_twi_io
   33 {
   34         int     dadr;                   /* Device address */
   35         int     type;                   /* read/write */
   36 #define TWI_IO_READ_MASTER      1
   37 #define TWI_IO_WRITE_MASTER     2
   38         int     iadrsz;                 /* Internal addr size */
   39         uint32_t iadr;                  /* Interbak addr */
   40         size_t  xfer_len;               /* Size to transfer */
   41         caddr_t xfer_buf;               /* buffer for xfer */
   42 };
   43 
   44 struct at91_twi_clock
   45 {
   46         int     ckdiv;                  /* Clock divider */
   47         int     high_rate;              /* rate of clock high period */
   48         int     low_rate;               /* rate of clock low period */
   49 };
   50 
   51 /** TWIIOCXFER: Do a two-wire transfer
   52  */
   53 #define TWIIOCXFER      _IOW('x', 1, struct at91_twi_io)
   54 
   55 /** TWIIOCSETCLOCK: Sets the clocking parameters for this operation.
   56  */
   57 #define TWIIOCSETCLOCK _IOW('x', 2, struct at91_twi_clock)
   58 
   59 #endif /* !_ARM_AT91_AT91_TWIIO_H */
   60 
   61 

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