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