smb.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  * $FreeBSD$
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/systm.h>
   34 #include <sys/module.h>
   35 #include <sys/bus.h>
   36 #include <sys/conf.h>
   37 #include <sys/uio.h>
   38 #include <sys/fcntl.h>
   39 
   40 #include <dev/smbus/smbconf.h>
   41 #include <dev/smbus/smbus.h>
   42 #include <dev/smbus/smb.h>
   43 
   44 #include "smbus_if.h"
   45 
   46 #define SMB_OLD_READB   _IOW('i', 7, struct smbcmd)
   47 #define SMB_OLD_READW   _IOW('i', 8, struct smbcmd)
   48 #define SMB_OLD_PCALL   _IOW('i', 9, struct smbcmd)
   49 
   50 struct smb_softc {
   51         device_t sc_dev;
   52         struct cdev *sc_devnode;
   53 };
   54 
   55 static void smb_identify(driver_t *driver, device_t parent);
   56 static int smb_probe(device_t);
   57 static int smb_attach(device_t);
   58 static int smb_detach(device_t);
   59 
   60 static device_method_t smb_methods[] = {
   61         /* device interface */
   62         DEVMETHOD(device_identify,      smb_identify),
   63         DEVMETHOD(device_probe,         smb_probe),
   64         DEVMETHOD(device_attach,        smb_attach),
   65         DEVMETHOD(device_detach,        smb_detach),
   66 
   67         /* smbus interface */
   68         DEVMETHOD(smbus_intr,           smbus_generic_intr),
   69         { 0, 0 }
   70 };
   71 
   72 static driver_t smb_driver = {
   73         "smb",
   74         smb_methods,
   75         sizeof(struct smb_softc),
   76 };
   77 
   78 static  d_ioctl_t       smbioctl;
   79 
   80 static struct cdevsw smb_cdevsw = {
   81         .d_version =    D_VERSION,
   82         .d_flags =      D_TRACKCLOSE,
   83         .d_ioctl =      smbioctl,
   84         .d_name =       "smb",
   85 };
   86 
   87 static void
   88 smb_identify(driver_t *driver, device_t parent)
   89 {
   90 
   91         if (device_find_child(parent, "smb", -1) == NULL)
   92                 BUS_ADD_CHILD(parent, 0, "smb", -1);
   93 }
   94 
   95 static int
   96 smb_probe(device_t dev)
   97 {
   98         if (smbus_get_addr(dev) != -1)
   99                 return (ENXIO);
  100 
  101         device_set_desc(dev, "SMBus generic I/O");
  102         return (BUS_PROBE_NOWILDCARD);
  103 }
  104 
  105 static int
  106 smb_attach(device_t dev)
  107 {
  108         struct smb_softc *sc;
  109         struct make_dev_args mda;
  110         int error;
  111 
  112         sc = device_get_softc(dev);
  113         sc->sc_dev = dev;
  114 
  115         make_dev_args_init(&mda);
  116         mda.mda_devsw = &smb_cdevsw;
  117         mda.mda_unit = device_get_unit(dev);
  118         mda.mda_uid = UID_ROOT;
  119         mda.mda_gid = GID_WHEEL;
  120         mda.mda_mode = 0600;
  121         mda.mda_si_drv1 = sc;
  122         error = make_dev_s(&mda, &sc->sc_devnode, "smb%d", mda.mda_unit);
  123         return (error);
  124 }
  125 
  126 static int
  127 smb_detach(device_t dev)
  128 {
  129         struct smb_softc *sc;
  130 
  131         sc = device_get_softc(dev);
  132         destroy_dev(sc->sc_devnode);
  133         return (0);
  134 }
  135 
  136 static int
  137 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
  138 {
  139         char buf[SMB_MAXBLOCKSIZE];
  140         device_t parent;
  141         struct smbcmd *s = (struct smbcmd *)data;
  142         struct smb_softc *sc = dev->si_drv1;
  143         device_t smbdev = sc->sc_dev;
  144         int error;
  145         int unit;
  146         u_char bcount;
  147 
  148         /*
  149          * If a specific slave device is being used, override any passed-in
  150          * slave.
  151          */
  152         unit = dev2unit(dev);
  153         if (unit & 0x0400)
  154                 s->slave = unit & 0x03ff;
  155 
  156         parent = device_get_parent(smbdev);
  157 
  158         /* Make sure that LSB bit is cleared. */
  159         if (s->slave & 0x1)
  160                 return (EINVAL);
  161 
  162         /* Allocate the bus. */
  163         if ((error = smbus_request_bus(parent, smbdev,
  164                         (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
  165                 return (error);
  166 
  167         switch (cmd) {
  168         case SMB_QUICK_WRITE:
  169                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
  170                 break;
  171 
  172         case SMB_QUICK_READ:
  173                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
  174                 break;
  175 
  176         case SMB_SENDB:
  177                 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
  178                 break;
  179 
  180         case SMB_RECVB:
  181                 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
  182                 break;
  183 
  184         case SMB_WRITEB:
  185                 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
  186                                                 s->wdata.byte));
  187                 break;
  188 
  189         case SMB_WRITEW:
  190                 error = smbus_error(smbus_writew(parent, s->slave,
  191                                                 s->cmd, s->wdata.word));
  192                 break;
  193 
  194         case SMB_OLD_READB:
  195         case SMB_READB:
  196                 /* NB: for SMB_OLD_READB the read data goes to rbuf only. */
  197                 error = smbus_error(smbus_readb(parent, s->slave, s->cmd,
  198                     &s->rdata.byte));
  199                 if (error)
  200                         break;
  201                 if (s->rbuf && s->rcount >= 1) {
  202                         error = copyout(&s->rdata.byte, s->rbuf, 1);
  203                         s->rcount = 1;
  204                 }
  205                 break;
  206 
  207         case SMB_OLD_READW:
  208         case SMB_READW:
  209                 /* NB: for SMB_OLD_READW the read data goes to rbuf only. */
  210                 error = smbus_error(smbus_readw(parent, s->slave, s->cmd,
  211                     &s->rdata.word));
  212                 if (error)
  213                         break;
  214                 if (s->rbuf && s->rcount >= 2) {
  215                         buf[0] = (u_char)s->rdata.word;
  216                         buf[1] = (u_char)(s->rdata.word >> 8);
  217                         error = copyout(buf, s->rbuf, 2);
  218                         s->rcount = 2;
  219                 }
  220                 break;
  221 
  222         case SMB_OLD_PCALL:
  223         case SMB_PCALL:
  224                 /* NB: for SMB_OLD_PCALL the read data goes to rbuf only. */
  225                 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
  226                     s->wdata.word, &s->rdata.word));
  227                 if (error)
  228                         break;
  229                 if (s->rbuf && s->rcount >= 2) {
  230                         buf[0] = (u_char)s->rdata.word;
  231                         buf[1] = (u_char)(s->rdata.word >> 8);
  232                         error = copyout(buf, s->rbuf, 2);
  233                         s->rcount = 2;
  234                 }
  235 
  236                 break;
  237 
  238         case SMB_BWRITE:
  239                 if (s->wcount < 0) {
  240                         error = EINVAL;
  241                         break;
  242                 }
  243                 if (s->wcount > SMB_MAXBLOCKSIZE)
  244                         s->wcount = SMB_MAXBLOCKSIZE;
  245                 if (s->wcount)
  246                         error = copyin(s->wbuf, buf, s->wcount);
  247                 if (error)
  248                         break;
  249                 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd,
  250                     s->wcount, buf));
  251                 break;
  252 
  253         case SMB_BREAD:
  254                 if (s->rcount < 0) {
  255                         error = EINVAL;
  256                         break;
  257                 }
  258                 if (s->rcount > SMB_MAXBLOCKSIZE)
  259                         s->rcount = SMB_MAXBLOCKSIZE;
  260                 error = smbus_error(smbus_bread(parent, s->slave, s->cmd,
  261                     &bcount, buf));
  262                 if (error)
  263                         break;
  264                 if (s->rcount > bcount)
  265                         s->rcount = bcount;
  266                 error = copyout(buf, s->rbuf, s->rcount);
  267                 break;
  268 
  269         default:
  270                 error = ENOTTY;
  271         }
  272 
  273         smbus_release_bus(parent, smbdev);
  274 
  275         return (error);
  276 }
  277 
  278 DRIVER_MODULE(smb, smbus, smb_driver, 0, 0);
  279 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
  280 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