iicbus_if.m

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    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 # $FreeBSD$
   27 #
   28 
   29 #include <sys/bus.h>
   30 #include <dev/iicbus/iic.h>
   31 
   32 INTERFACE iicbus;
   33 
   34 CODE {
   35         static int iicbus_nosupport(void)
   36         {
   37 
   38                 return (ENODEV);
   39         }
   40 
   41         static u_int
   42         iicbus_default_frequency(device_t bus, u_char speed)
   43         {
   44 
   45                 return (100000);
   46         }
   47 };
   48 
   49 #
   50 # Interpret interrupt
   51 #
   52 METHOD int intr {
   53         device_t dev;
   54         int event;
   55         char *buf;
   56 };
   57 
   58 #
   59 # iicbus callback
   60 # Request ownership of bus
   61 # index: IIC_REQUEST_BUS or IIC_RELEASE_BUS
   62 # data: pointer to int containing IIC_WAIT or IIC_DONTWAIT and either IIC_INTR or IIC_NOINTR
   63 # This function is allowed to sleep if *data contains IIC_WAIT.
   64 #
   65 METHOD int callback {
   66         device_t dev;
   67         int index;
   68         caddr_t data;
   69 };
   70 
   71 #
   72 # Send REPEATED_START condition
   73 #
   74 METHOD int repeated_start {
   75         device_t dev;
   76         u_char slave;
   77         int timeout;
   78 } DEFAULT iicbus_nosupport;
   79 
   80 #
   81 # Send START condition
   82 #
   83 METHOD int start {
   84         device_t dev;
   85         u_char slave;
   86         int timeout;
   87 } DEFAULT iicbus_nosupport;
   88 
   89 #
   90 # Send STOP condition
   91 #
   92 METHOD int stop {
   93         device_t dev;
   94 } DEFAULT iicbus_nosupport;
   95 
   96 #
   97 # Read from I2C bus
   98 #
   99 METHOD int read {
  100         device_t dev;
  101         char *buf;
  102         int len;
  103         int *bytes;
  104         int last;
  105         int delay;
  106 } DEFAULT iicbus_nosupport;
  107 
  108 #
  109 # Write to the I2C bus
  110 #
  111 METHOD int write {
  112         device_t dev;
  113         const char *buf;
  114         int len;
  115         int *bytes;
  116         int timeout;
  117 } DEFAULT iicbus_nosupport;
  118 
  119 #
  120 # Reset I2C bus
  121 #
  122 METHOD int reset {
  123         device_t dev;
  124         u_char speed;
  125         u_char addr;
  126         u_char *oldaddr;
  127 };
  128 
  129 #
  130 # Generalized Read/Write interface
  131 #
  132 METHOD int transfer {
  133         device_t dev;
  134         struct iic_msg *msgs;
  135         uint32_t nmsgs;
  136 };
  137 
  138 #
  139 # Return the frequency in Hz for the bus running at the given 
  140 # symbolic speed.  Only the IIC_SLOW speed has meaning, it is always
  141 # 100KHz.  The UNKNOWN, FAST, and FASTEST rates all map to the
  142 # configured bus frequency, or 100KHz when not otherwise configured.
  143 #
  144 METHOD u_int get_frequency {
  145         device_t dev;
  146         u_char speed;
  147 } DEFAULT iicbus_default_frequency;

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FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/iicbus_if.m

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/iicbus_if.m