smbus.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1998, 2001 Nicolas Souchu
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 #include <sys/lock.h>
   37 #include <sys/malloc.h>
   38 #include <sys/module.h>
   39 #include <sys/mutex.h>
   40 #include <sys/sbuf.h>
   41 
   42 #include <dev/smbus/smbconf.h>
   43 #include <dev/smbus/smbus.h>
   44 
   45 #include "smbus_if.h"
   46 #include "bus_if.h"
   47 
   48 struct smbus_ivar
   49 {
   50         uint8_t addr;
   51 };
   52 
   53 /*
   54  * Autoconfiguration and support routines for System Management bus
   55  */
   56 
   57 static int
   58 smbus_probe(device_t dev)
   59 {
   60 
   61         device_set_desc(dev, "System Management Bus");
   62 
   63         return (0);
   64 }
   65 
   66 static int
   67 smbus_attach(device_t dev)
   68 {
   69         struct smbus_softc *sc = device_get_softc(dev);
   70 
   71         mtx_init(&sc->lock, device_get_nameunit(dev), "smbus", MTX_DEF);
   72         bus_generic_probe(dev);
   73         bus_enumerate_hinted_children(dev);
   74         bus_generic_attach(dev);
   75 
   76         return (0);
   77 }
   78 
   79 static int
   80 smbus_detach(device_t dev)
   81 {
   82         struct smbus_softc *sc = device_get_softc(dev);
   83         int error;
   84 
   85         error = bus_generic_detach(dev);
   86         if (error)
   87                 return (error);
   88         device_delete_children(dev);
   89         mtx_destroy(&sc->lock);
   90 
   91         return (0);
   92 }
   93 
   94 void
   95 smbus_generic_intr(device_t dev, u_char devaddr, char low, char high, int err)
   96 {
   97 }
   98 
   99 static device_t
  100 smbus_add_child(device_t dev, u_int order, const char *name, int unit)
  101 {
  102         struct smbus_ivar *devi;
  103         device_t child;
  104 
  105         child = device_add_child_ordered(dev, order, name, unit);
  106         if (child == NULL)
  107                 return (child);
  108         devi = malloc(sizeof(struct smbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
  109         if (devi == NULL) {
  110                 device_delete_child(dev, child);
  111                 return (NULL);
  112         }
  113         device_set_ivars(child, devi);
  114         return (child);
  115 }
  116 
  117 static void
  118 smbus_hinted_child(device_t bus, const char *dname, int dunit)
  119 {
  120         struct smbus_ivar *devi;
  121         device_t child;
  122         int addr;
  123 
  124         addr = 0;
  125         resource_int_value(dname, dunit, "addr", &addr);
  126         if (addr > UINT8_MAX) {
  127                 device_printf(bus, "ignored incorrect slave address hint 0x%x"
  128                     " for %s%d\n", addr, dname, dunit);
  129                 return;
  130         }
  131         child = BUS_ADD_CHILD(bus, SMBUS_ORDER_HINTED, dname, dunit);
  132         if (child == NULL)
  133                 return;
  134         devi = device_get_ivars(child);
  135         devi->addr = addr;
  136 }
  137 
  138 static int
  139 smbus_child_location(device_t parent, device_t child, struct sbuf *sb)
  140 {
  141         struct smbus_ivar *devi;
  142 
  143         devi = device_get_ivars(child);
  144         if (devi->addr != 0)
  145                 sbuf_printf(sb, "addr=0x%x", devi->addr);
  146         return (0);
  147 }
  148 
  149 static int
  150 smbus_print_child(device_t parent, device_t child)
  151 {
  152         struct smbus_ivar *devi;
  153         int retval;
  154 
  155         devi = device_get_ivars(child);
  156         retval = bus_print_child_header(parent, child);
  157         if (devi->addr != 0)
  158                 retval += printf(" at addr 0x%x", devi->addr);
  159         retval += bus_print_child_footer(parent, child);
  160 
  161         return (retval);
  162 }
  163 
  164 static int
  165 smbus_read_ivar(device_t parent, device_t child, int which, uintptr_t *result)
  166 {
  167         struct smbus_ivar *devi;
  168 
  169         devi = device_get_ivars(child);
  170         switch (which) {
  171         case SMBUS_IVAR_ADDR:
  172                 if (devi->addr != 0)
  173                         *result = devi->addr;
  174                 else
  175                         *result = -1;
  176                 break;
  177         default:
  178                 return (ENOENT);
  179         }
  180         return (0);
  181 }
  182 
  183 static int
  184 smbus_write_ivar(device_t parent, device_t child, int which, uintptr_t value)
  185 {
  186         struct smbus_ivar *devi;
  187 
  188         devi = device_get_ivars(child);
  189         switch (which) {
  190         case SMBUS_IVAR_ADDR:
  191                 /* Allow to set but no change the slave address. */
  192                 if (devi->addr != 0)
  193                         return (EINVAL);
  194                 devi->addr = value;
  195                 break;
  196         default:
  197                 return (ENOENT);
  198         }
  199         return (0);
  200 }
  201 
  202 static void
  203 smbus_probe_nomatch(device_t bus, device_t child)
  204 {
  205         struct smbus_ivar *devi = device_get_ivars(child);
  206 
  207         /*
  208          * Ignore (self-identified) devices without a slave address set.
  209          * For example, smb(4).
  210          */
  211         if (devi->addr != 0)
  212                 device_printf(bus, "<unknown device> at addr %#x\n",
  213                     devi->addr);
  214 }
  215 
  216 /*
  217  * Device methods
  218  */
  219 static device_method_t smbus_methods[] = {
  220         /* device interface */
  221         DEVMETHOD(device_probe,         smbus_probe),
  222         DEVMETHOD(device_attach,        smbus_attach),
  223         DEVMETHOD(device_detach,        smbus_detach),
  224 
  225         /* bus interface */
  226         DEVMETHOD(bus_add_child,        smbus_add_child),
  227         DEVMETHOD(bus_hinted_child,     smbus_hinted_child),
  228         DEVMETHOD(bus_probe_nomatch,    smbus_probe_nomatch),
  229         DEVMETHOD(bus_child_location,   smbus_child_location),
  230         DEVMETHOD(bus_print_child,      smbus_print_child),
  231         DEVMETHOD(bus_read_ivar,        smbus_read_ivar),
  232         DEVMETHOD(bus_write_ivar,       smbus_write_ivar),
  233 
  234         DEVMETHOD_END
  235 };
  236 
  237 driver_t smbus_driver = {
  238         "smbus",
  239         smbus_methods,
  240         sizeof(struct smbus_softc),
  241 };
  242 
  243 MODULE_VERSION(smbus, SMBUS_MODVER);

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FreeBSD/Linux Kernel Cross Reference sys/dev/smbus/smbus.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/smbus/smbus.c