sys/bus/smbus/smbus.c

   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: src/sys/dev/smbus/smbus.c,v 1.18.10.4 2006/09/26 18:44:56 jhb Exp $
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/systm.h>
  31 #include <sys/kernel.h>
  32 #include <sys/module.h>
  33 #include <sys/bus.h>
  34
  35 #include "smbconf.h"
  36 #include "smbus.h"
  37 #include "smbus_if.h"
  38
  39 /*
  40  * Autoconfiguration and support routines for System Management bus
  41  */
  42
  43 /*
  44  * Device methods
  45  */
  46 static int smbus_probe(device_t);
  47 static int smbus_attach(device_t);
  48 static int smbus_detach(device_t);
  49
  50 static device_t smbus_add_child(device_t bus, device_t parent, int order,
  51                                 const char *name, int unit);
  52 static void smbus_probe_device(device_t dev, u_char addr);
  53
  54 static device_method_t smbus_methods[] = {
  55         /* device interface */
  56         DEVMETHOD(device_probe,         smbus_probe),
  57         DEVMETHOD(device_attach,        smbus_attach),
  58         DEVMETHOD(device_detach,        smbus_detach),
  59
  60         /* bus interface */
  61         DEVMETHOD(bus_add_child,        smbus_add_child),
  62         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
  63         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  64
  65         DEVMETHOD_END
  66 };
  67
  68 driver_t smbus_driver = {
  69         "smbus",
  70         smbus_methods,
  71         sizeof(struct smbus_softc),
  72 };
  73
  74 devclass_t smbus_devclass;
  75
  76 /*
  77  * At 'probe' time, we add all the devices which we know about to the
  78  * bus.  The generic attach routine will probe and attach them if they
  79  * are alive.
  80  */
  81 static int
  82 smbus_probe(device_t dev)
  83 {
  84         device_set_desc(dev, "System Management Bus");
  85
  86         return (0);
  87 }
  88
  89 static int
  90 smbus_attach(device_t dev)
  91 {
  92         unsigned char addr;
  93
  94         device_add_child(dev, NULL, device_get_unit(dev));
  95         for (addr = 16; addr < 112; ++addr) {
  96                 smbus_probe_device(dev, addr);
  97         }
  98
  99         /*bus_generic_probe(dev);*/
 100         bus_generic_attach(dev);
 101
 102         return (0);
 103 }
 104
 105 static int
 106 smbus_detach(device_t dev)
 107 {
 108         int error;
 109
 110         error = bus_generic_detach(dev);
 111         if (error)
 112                 return (error);
 113
 114         return (0);
 115 }
 116
 117 void
 118 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high)
 119 {
 120 }
 121
 122 static void
 123 smbus_probe_device(device_t dev, u_char addr)
 124 {
 125         int error;
 126         u_char cmd;
 127         u_char buf[2];
 128
 129         cmd = 0x01;
 130
 131         error = smbus_trans(dev, addr, cmd,
 132                             SMB_TRANS_NOCNT | SMB_TRANS_NOREPORT,
 133                             NULL, 0, buf, 1, NULL);
 134         if (error == 0) {
 135                 device_printf(dev, "Probed address 0x%02x\n", addr);
 136                 /* device_add_child / specific */
 137                 device_add_child(dev, NULL,
 138                                  (device_get_unit(dev) << 11) | 0x0400 | addr);
 139         }
 140 }
 141
 142 static device_t
 143 smbus_add_child(device_t bus, device_t parent, int order,
 144                 const char *name, int unit)
 145 {
 146         device_t child;
 147
 148         kprintf("smbus_add_child unit %d\n", unit);
 149         child = device_add_child_ordered(parent, order, name, unit);
 150         device_probe_and_attach(child);
 151
 152         return child;
 153 }
 154
 155
 156 MODULE_VERSION(smbus, SMBUS_MODVER);