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/dev/iicbus/iicbus.c

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    1 /*-
    2  * Copyright (c) 1998, 2001 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: releng/5.0/sys/dev/iicbus/iicbus.c 93023 2002-03-23 15:49:15Z nsouch $
   27  *
   28  */
   29 
   30 /*
   31  * Autoconfiguration and support routines for the Philips serial I2C bus
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/bus.h> 
   39 
   40 
   41 #include <dev/iicbus/iiconf.h>
   42 #include <dev/iicbus/iicbus.h>
   43 
   44 #include "iicbus_if.h"
   45 
   46 #define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev))
   47 
   48 static devclass_t iicbus_devclass;
   49 
   50 /*
   51  * Device methods
   52  */
   53 static int iicbus_probe(device_t);
   54 static int iicbus_attach(device_t);
   55 static int iicbus_detach(device_t);
   56 static int iicbus_add_child(device_t dev, int order, const char *name, int unit);
   57 
   58 static device_method_t iicbus_methods[] = {
   59         /* device interface */
   60         DEVMETHOD(device_probe,         iicbus_probe),
   61         DEVMETHOD(device_attach,        iicbus_attach),
   62         DEVMETHOD(device_detach,        iicbus_detach),
   63 
   64         /* bus interface */
   65         DEVMETHOD(bus_add_child,        iicbus_add_child),
   66         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
   67         DEVMETHOD(bus_print_child,      bus_generic_print_child),
   68 
   69         { 0, 0 }
   70 };
   71 
   72 static driver_t iicbus_driver = {
   73         "iicbus",
   74         iicbus_methods,
   75         sizeof(struct iicbus_softc),
   76 };
   77 
   78 static int
   79 iicbus_probe(device_t dev)
   80 {
   81         device_set_desc(dev, "Philips I2C bus");
   82 
   83         return (0);
   84 }
   85 
   86 #if 0
   87 static int 
   88 iic_probe_device(device_t dev, u_char addr)
   89 {
   90         int count;
   91         char byte;
   92 
   93         if ((addr & 1) == 0) {
   94                 /* is device writable? */
   95                 if (!iicbus_start(dev, (u_char)addr, 0)) {
   96                         iicbus_stop(dev);
   97                         return (1);
   98                 }
   99         } else {
  100                 /* is device readable? */
  101                 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count))
  102                         return (1);
  103         }
  104 
  105         return (0);
  106 }
  107 #endif
  108 
  109 /*
  110  * We add all the devices which we know about.
  111  * The generic attach routine will attach them if they are alive.
  112  */
  113 static int
  114 iicbus_attach(device_t dev)
  115 {
  116         iicbus_reset(dev, IIC_FASTEST, 0, NULL);
  117 
  118         /* device probing is meaningless since the bus is supposed to be
  119          * hot-plug. Moreover, some I2C chips do not appreciate random
  120          * accesses like stop after start to fast, reads for less than
  121          * x bytes...
  122          */
  123 #if 0
  124         printf("Probing for devices on iicbus%d:", device_get_unit(dev));
  125 
  126         /* probe any devices */
  127         for (addr = FIRST_SLAVE_ADDR; addr <= LAST_SLAVE_ADDR; addr++) {
  128                 if (iic_probe_device(dev, (u_char)addr)) {
  129                         printf(" <%x>", addr);
  130                 }
  131         }
  132         printf("\n");
  133 #endif
  134   
  135         /* attach any known device */
  136         device_add_child(dev, NULL, -1);
  137 
  138         bus_generic_attach(dev);
  139          
  140         return (0);
  141 }
  142   
  143 static int
  144 iicbus_detach(device_t dev)
  145 {
  146         iicbus_reset(dev, IIC_FASTEST, 0, NULL);
  147   
  148         bus_generic_detach(dev);
  149   
  150         return (0);
  151 }
  152   
  153 static int
  154 iicbus_add_child(device_t dev, int order, const char *name, int unit)
  155 {
  156         device_add_child_ordered(dev, order, name, unit);
  157 
  158         bus_generic_attach(dev);
  159 
  160         return (0);
  161 }
  162 
  163 int
  164 iicbus_generic_intr(device_t dev, int event, char *buf)
  165 {
  166         return (0);
  167 }
  168 
  169 int
  170 iicbus_null_callback(device_t dev, int index, caddr_t data)
  171 {
  172         return (0);
  173 }
  174 
  175 int
  176 iicbus_null_repeated_start(device_t dev, u_char addr)
  177 {
  178         return (IIC_ENOTSUPP);
  179 }
  180 
  181 DRIVER_MODULE(iicbus, pcf, iicbus_driver, iicbus_devclass, 0, 0);
  182 DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0);
  183 DRIVER_MODULE(iicbus, bti2c, iicbus_driver, iicbus_devclass, 0, 0);
  184 MODULE_VERSION(iicbus, IICBUS_MODVER);

Cache object: d87d90fdc662824198ac6a8dcce7e361


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