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