smb.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/8.1/sys/dev/smbus/smb.c 188077 2009-02-03 16:14:37Z jhb $
   27  */
   28 
   29 #ifdef HAVE_KERNEL_OPTION_HEADERS
   30 #include "opt_compat.h"
   31 #endif
   32 
   33 #include <sys/param.h>
   34 #include <sys/kernel.h>
   35 #include <sys/systm.h>
   36 #include <sys/module.h>
   37 #include <sys/bus.h>
   38 #include <sys/conf.h>
   39 #include <sys/uio.h>
   40 #include <sys/fcntl.h>
   41 
   42 #include <dev/smbus/smbconf.h>
   43 #include <dev/smbus/smbus.h>
   44 #include <dev/smbus/smb.h>
   45 
   46 #include "smbus_if.h"
   47 
   48 #define BUFSIZE 1024
   49 
   50 struct smb_softc {
   51         device_t sc_dev;
   52         int sc_count;                   /* >0 if device opened */
   53         struct cdev *sc_devnode;
   54         struct mtx sc_lock;
   55 };
   56 
   57 static void smb_identify(driver_t *driver, device_t parent);
   58 static int smb_probe(device_t);
   59 static int smb_attach(device_t);
   60 static int smb_detach(device_t);
   61 
   62 static devclass_t smb_devclass;
   63 
   64 static device_method_t smb_methods[] = {
   65         /* device interface */
   66         DEVMETHOD(device_identify,      smb_identify),
   67         DEVMETHOD(device_probe,         smb_probe),
   68         DEVMETHOD(device_attach,        smb_attach),
   69         DEVMETHOD(device_detach,        smb_detach),
   70 
   71         /* smbus interface */
   72         DEVMETHOD(smbus_intr,           smbus_generic_intr),
   73 
   74         { 0, 0 }
   75 };
   76 
   77 static driver_t smb_driver = {
   78         "smb",
   79         smb_methods,
   80         sizeof(struct smb_softc),
   81 };
   82 
   83 static  d_open_t        smbopen;
   84 static  d_close_t       smbclose;
   85 static  d_ioctl_t       smbioctl;
   86 
   87 static struct cdevsw smb_cdevsw = {
   88         .d_version =    D_VERSION,
   89         .d_flags =      D_TRACKCLOSE,
   90         .d_open =       smbopen,
   91         .d_close =      smbclose,
   92         .d_ioctl =      smbioctl,
   93         .d_name =       "smb",
   94 };
   95 
   96 static void
   97 smb_identify(driver_t *driver, device_t parent)
   98 {
   99 
  100         if (device_find_child(parent, "smb", -1) == NULL)
  101                 BUS_ADD_CHILD(parent, 0, "smb", -1);
  102 }
  103 
  104 static int
  105 smb_probe(device_t dev)
  106 {
  107         device_set_desc(dev, "SMBus generic I/O");
  108 
  109         return (0);
  110 }
  111         
  112 static int
  113 smb_attach(device_t dev)
  114 {
  115         struct smb_softc *sc = device_get_softc(dev);
  116 
  117         sc->sc_dev = dev;
  118         sc->sc_devnode = make_dev(&smb_cdevsw, device_get_unit(dev),
  119             UID_ROOT, GID_WHEEL, 0600, "smb%d", device_get_unit(dev));
  120         sc->sc_devnode->si_drv1 = sc;
  121         mtx_init(&sc->sc_lock, device_get_nameunit(dev), NULL, MTX_DEF);
  122 
  123         return (0);
  124 }
  125 
  126 static int
  127 smb_detach(device_t dev)
  128 {
  129         struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
  130 
  131         if (sc->sc_devnode)
  132                 destroy_dev(sc->sc_devnode);
  133         mtx_destroy(&sc->sc_lock);
  134 
  135         return (0);
  136 }
  137 
  138 static int
  139 smbopen(struct cdev *dev, int flags, int fmt, struct thread *td)
  140 {
  141         struct smb_softc *sc = dev->si_drv1;
  142 
  143         mtx_lock(&sc->sc_lock);
  144         if (sc->sc_count != 0) {
  145                 mtx_unlock(&sc->sc_lock);
  146                 return (EBUSY);
  147         }
  148 
  149         sc->sc_count++;
  150         mtx_unlock(&sc->sc_lock);
  151 
  152         return (0);
  153 }
  154 
  155 static int
  156 smbclose(struct cdev *dev, int flags, int fmt, struct thread *td)
  157 {
  158         struct smb_softc *sc = dev->si_drv1;
  159 
  160         mtx_lock(&sc->sc_lock);
  161         KASSERT(sc->sc_count == 1, ("device not busy"));
  162         sc->sc_count--;
  163         mtx_unlock(&sc->sc_lock);
  164 
  165         return (0);
  166 }
  167 
  168 static int
  169 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
  170 {
  171         char buf[SMB_MAXBLOCKSIZE];
  172         device_t parent;
  173         struct smbcmd *s = (struct smbcmd *)data;
  174         struct smb_softc *sc = dev->si_drv1;
  175         device_t smbdev = sc->sc_dev;
  176         int error;
  177         short w;
  178         u_char count;
  179         char c;
  180 
  181         parent = device_get_parent(smbdev);
  182 
  183         /* Make sure that LSB bit is cleared. */
  184         if (s->slave & 0x1)
  185                 return (EINVAL);
  186 
  187         /* Allocate the bus. */
  188         if ((error = smbus_request_bus(parent, smbdev,
  189                         (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
  190                 return (error);
  191 
  192         switch (cmd) {
  193         case SMB_QUICK_WRITE:
  194                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
  195                 break;
  196 
  197         case SMB_QUICK_READ:
  198                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
  199                 break;
  200 
  201         case SMB_SENDB:
  202                 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
  203                 break;
  204 
  205         case SMB_RECVB:
  206                 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
  207                 break;
  208 
  209         case SMB_WRITEB:
  210                 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
  211                                                 s->data.byte));
  212                 break;
  213 
  214         case SMB_WRITEW:
  215                 error = smbus_error(smbus_writew(parent, s->slave,
  216                                                 s->cmd, s->data.word));
  217                 break;
  218 
  219         case SMB_READB:
  220                 if (s->data.byte_ptr) {
  221                         error = smbus_error(smbus_readb(parent, s->slave,
  222                                                 s->cmd, &c));
  223                         if (error)
  224                                 break;
  225                         error = copyout(&c, s->data.byte_ptr,
  226                                         sizeof(*(s->data.byte_ptr)));
  227                 }
  228                 break;
  229 
  230         case SMB_READW:
  231                 if (s->data.word_ptr) {
  232                         error = smbus_error(smbus_readw(parent, s->slave,
  233                                                 s->cmd, &w));
  234                         if (error == 0) {
  235                                 error = copyout(&w, s->data.word_ptr,
  236                                                 sizeof(*(s->data.word_ptr)));
  237                         }
  238                 }
  239                 break;
  240 
  241         case SMB_PCALL:
  242                 if (s->data.process.rdata) {
  243 
  244                         error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
  245                                 s->data.process.sdata, &w));
  246                         if (error)
  247                                 break;
  248                         error = copyout(&w, s->data.process.rdata,
  249                                         sizeof(*(s->data.process.rdata)));
  250                 }
  251                 
  252                 break;
  253 
  254         case SMB_BWRITE:
  255                 if (s->count && s->data.byte_ptr) {
  256                         if (s->count > SMB_MAXBLOCKSIZE)
  257                                 s->count = SMB_MAXBLOCKSIZE;
  258                         error = copyin(s->data.byte_ptr, buf, s->count);
  259                         if (error)
  260                                 break;
  261                         error = smbus_error(smbus_bwrite(parent, s->slave,
  262                                                 s->cmd, s->count, buf));
  263                 }
  264                 break;
  265 
  266 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD6)
  267         case SMB_OLD_BREAD:
  268 #endif
  269         case SMB_BREAD:
  270                 if (s->count && s->data.byte_ptr) {
  271                         count = min(s->count, SMB_MAXBLOCKSIZE);
  272                         error = smbus_error(smbus_bread(parent, s->slave,
  273                                                 s->cmd, &count, buf));
  274                         if (error)
  275                                 break;
  276                         error = copyout(buf, s->data.byte_ptr,
  277                             min(count, s->count));
  278                         s->count = count;
  279                 }
  280                 break;
  281                 
  282         default:
  283                 error = ENOTTY;
  284         }
  285 
  286         smbus_release_bus(parent, smbdev);
  287 
  288         return (error);
  289 }
  290 
  291 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
  292 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
  293 MODULE_VERSION(smb, 1);
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FreeBSD/Linux Kernel Cross Reference sys/dev/smbus/smb.c

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