sys/bus/smbus/smbus.c

   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: src/sys/dev/smbus/smbus.c,v 1.12.2.3 2002/04/19 05:52:12 nsouch Exp $
  27  * $DragonFly: src/sys/bus/smbus/smbus.c,v 1.4 2006/12/22 23:12:17 swildner Exp $
  28  *
  29  */
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/kernel.h>
  33 #include <sys/module.h>
  34 #include <sys/bus.h>
  35
  36 #include "smbconf.h"
  37 #include "smbus.h"
  38
  39 /*
  40  * Autoconfiguration and support routines for the Philips serial I2C bus
  41  */
  42
  43 #define DEVTOSMBUS(dev) ((struct smbus_device*)device_get_ivars(dev))
  44
  45 /*
  46  * structure used to attach devices to the I2C bus
  47  */
  48 struct smbus_device {
  49         const char *smbd_name;          /* device name */
  50         const char *smbd_desc;          /* device descriptor */
  51 };
  52
  53 /*
  54  * list of known devices
  55  */
  56 struct smbus_device smbus_children[] = {
  57         { "smb", "SMBus general purpose I/O" },
  58         { NULL, 0 }
  59 };
  60
  61 static devclass_t smbus_devclass;
  62
  63 /*
  64  * Device methods
  65  */
  66 static int smbus_probe(device_t);
  67 static int smbus_attach(device_t);
  68
  69 #if 0
  70 static int smbus_read_ivar(device_t , device_t, int, u_long *);
  71 #endif
  72
  73 static device_method_t smbus_methods[] = {
  74         /* device interface */
  75         DEVMETHOD(device_probe,         smbus_probe),
  76         DEVMETHOD(device_attach,        smbus_attach),
  77         DEVMETHOD(device_detach,        bus_generic_detach),
  78         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  79
  80         /* bus interface */
  81         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  82         DEVMETHOD(bus_read_ivar,        bus_generic_read_ivar),
  83         DEVMETHOD(bus_write_ivar,       bus_generic_write_ivar),
  84
  85         { 0, 0 }
  86 };
  87
  88 static driver_t smbus_driver = {
  89         "smbus",
  90         smbus_methods,
  91         sizeof(struct smbus_softc),
  92 };
  93
  94 /*
  95  * At 'probe' time, we add all the devices which we know about to the
  96  * bus.  The generic attach routine will probe and attach them if they
  97  * are alive.
  98  */
  99 static int
 100 smbus_probe(device_t dev)
 101 {
 102         device_set_desc(dev, "System Management Bus");
 103
 104         return (0);
 105 }
 106
 107 static int
 108 smbus_attach(device_t dev)
 109 {
 110         struct smbus_device *smbdev;
 111
 112         /* add known devices */
 113         for (smbdev = smbus_children; smbdev->smbd_name; smbdev++) {
 114                 device_t child;
 115
 116                 if (devclass_find(smbdev->smbd_name)) {
 117                         child = device_add_child(dev, smbdev->smbd_name, -1);
 118                         device_set_ivars(child, smbdev);
 119                         device_set_desc(child, smbdev->smbd_desc);
 120                 } else if (bootverbose)
 121                         kprintf("smbus: %s devclass not found\n",
 122                                 smbdev->smbd_name);
 123         }
 124         bus_generic_attach(dev);
 125
 126         return (0);
 127 }
 128
 129 void
 130 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high)
 131 {
 132         return;
 133 }
 134
 135 #if 0
 136 static int
 137 smbus_read_ivar(device_t bus, device_t dev, int index, u_long* result)
 138 {
 139         struct smbus_device* smbdev = DEVTOSMBUS(dev);
 140
 141         switch (index) {
 142         default:
 143                 break;
 144         }
 145         return (ENOENT);
 146 }
 147 #endif
 148
 149 DRIVER_MODULE(smbus, iicsmb, smbus_driver, smbus_devclass, 0, 0);
 150 DRIVER_MODULE(smbus, bti2c, smbus_driver, smbus_devclass, 0, 0);
 151 DRIVER_MODULE(smbus, intsmb, smbus_driver, smbus_devclass, 0, 0);
 152 DRIVER_MODULE(smbus, alsmb, smbus_driver, smbus_devclass, 0, 0);
 153 DRIVER_MODULE(smbus, ichsmb, smbus_driver, smbus_devclass, 0, 0);
 154 DRIVER_MODULE(smbus, amdsmb, smbus_driver, smbus_devclass, 0, 0);
 155 DRIVER_MODULE(smbus, viapropm, smbus_driver, smbus_devclass, 0, 0);