sys/bus/iicbus/iic.h

   1 /*-
   2  * Copyright (c) 1998 Nicolas Souchu
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: head/sys/dev/iicbus/iic.h 210998 2010-08-07 08:31:32Z joel $
  27  *
  28  */
  29 #ifndef __IIC_H
  30 #define __IIC_H
  31
  32 #include <sys/ioccom.h>
  33
  34 /* Designed to be compatible with linux's struct i2c_msg */
  35 struct iic_msg
  36 {
  37         uint16_t        slave;
  38         uint16_t        flags;
  39 #define IIC_M_WR        0       /* Fake flag for write */
  40 #define IIC_M_RD        0x0001  /* read vs write */
  41 #define IIC_M_NOSTOP    0x0002  /* do not send a I2C stop after message */
  42 #define IIC_M_NOSTART   0x0004  /* do not send a I2C start before message */
  43         uint16_t        len;    /* msg length */
  44         uint8_t *       buf;
  45 };
  46
  47 struct iiccmd {
  48         u_char slave;
  49         int count;
  50         int last;
  51         char *buf;
  52 };
  53
  54 struct iic_rdwr_data {
  55         struct iic_msg *msgs;
  56         uint32_t nmsgs;
  57 };
  58
  59 #define I2CSTART        _IOW('i', 1, struct iiccmd)     /* start condition */
  60 #define I2CSTOP         _IO('i', 2)                     /* stop condition */
  61 #define I2CRSTCARD      _IOW('i', 3, struct iiccmd)     /* reset the card */
  62 #define I2CWRITE        _IOW('i', 4, struct iiccmd)     /* send data */
  63 #define I2CREAD         _IOW('i', 5, struct iiccmd)     /* receive data */
  64 #define I2CRDWR         _IOW('i', 6, struct iic_rdwr_data)      /* General read/write interface */
  65 #define I2CRPTSTART     _IOW('i', 7, struct iiccmd)     /* repeated start */
  66
  67 #endif