sys/bus/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: src/sys/dev/smbus/smb.c,v 1.34.8.2 2006/09/22 19:19:16 jhb Exp $
  27  *
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/kernel.h>
  32 #include <sys/systm.h>
  33 #include <sys/device.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 "smbconf.h"
  41 #include "smbus.h"
  42 #include "smb.h"
  43
  44 #include "smbus_if.h"
  45
  46 #define BUFSIZE 1024
  47
  48 struct smb_softc {
  49
  50         int sc_count;                   /* >0 if device opened */
  51         cdev_t sc_devnode;
  52 };
  53
  54 #define IIC_SOFTC(unit) \
  55         ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit)))
  56
  57 #define IIC_DEVICE(unit) \
  58         (devclass_get_device(smb_devclass, (unit)))
  59
  60 static void smb_identify(driver_t *driver, device_t parent);
  61 static int smb_probe(device_t);
  62 static int smb_attach(device_t);
  63 static int smb_detach(device_t);
  64
  65 static devclass_t smb_devclass;
  66
  67 static device_method_t smb_methods[] = {
  68         /* device interface */
  69         DEVMETHOD(device_identify,      smb_identify),
  70         DEVMETHOD(device_probe,         smb_probe),
  71         DEVMETHOD(device_attach,        smb_attach),
  72         DEVMETHOD(device_detach,        smb_detach),
  73
  74         /* smbus interface */
  75         DEVMETHOD(smbus_intr,           smbus_generic_intr),
  76
  77         { 0, 0 }
  78 };
  79
  80 static driver_t smb_driver = {
  81         "smb",
  82         smb_methods,
  83         sizeof(struct smb_softc),
  84 };
  85
  86 static  d_open_t        smbopen;
  87 static  d_close_t       smbclose;
  88 static  d_ioctl_t       smbioctl;
  89
  90 static struct dev_ops smb_ops = {
  91         { "smb", 0, 0 },
  92         .d_open =       smbopen,
  93         .d_close =      smbclose,
  94         .d_ioctl =      smbioctl,
  95 };
  96
  97 static void
  98 smb_identify(driver_t *driver, device_t parent)
  99 {
 100         if (device_find_child(parent, "smb", -1) == NULL)
 101                 BUS_ADD_CHILD(parent, 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 = (struct smb_softc *)device_get_softc(dev);
 116
 117         if (!sc)
 118                 return (ENOMEM);
 119
 120         bzero(sc, sizeof(struct smb_softc *));
 121
 122         sc->sc_devnode = make_dev(&smb_ops, device_get_unit(dev),
 123                         UID_ROOT, GID_WHEEL,
 124                         0600, "smb%d", device_get_unit(dev));
 125
 126         return (0);
 127 }
 128
 129 static int
 130 smb_detach(device_t dev)
 131 {
 132         struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
 133
 134         if (sc->sc_devnode)
 135                 dev_ops_remove_minor(&smb_ops, device_get_unit(dev));
 136
 137         return (0);
 138 }
 139
 140 static int
 141 smbopen (struct dev_open_args *ap)
 142 {
 143         cdev_t dev = ap->a_head.a_dev;
 144         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 145
 146         if (sc == NULL)
 147                 return (ENXIO);
 148
 149         if (sc->sc_count != 0)
 150                 return (EBUSY);
 151
 152         sc->sc_count++;
 153
 154         return (0);
 155 }
 156
 157 static int
 158 smbclose(struct dev_close_args *ap)
 159 {
 160         cdev_t dev = ap->a_head.a_dev;
 161         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 162
 163         if (sc == NULL)
 164                 return (ENXIO);
 165
 166         if (sc->sc_count == 0)
 167                 /* This is not supposed to happen. */
 168                 return (0);
 169
 170         sc->sc_count--;
 171
 172         return (0);
 173 }
 174
 175 #if 0
 176 static int
 177 smbwrite(struct dev_write_args *ap)
 178 {
 179         return (EINVAL);
 180 }
 181
 182 static int
 183 smbread(struct dev_read_args *ap)
 184 {
 185         return (EINVAL);
 186 }
 187 #endif
 188
 189 static int
 190 smbioctl(struct dev_ioctl_args *ap)
 191 {
 192         cdev_t dev = ap->a_head.a_dev;
 193         char buf[SMB_MAXBLOCKSIZE];
 194         device_t parent;
 195         struct smbcmd *s = (struct smbcmd *)ap->a_data;
 196         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 197         device_t smbdev = IIC_DEVICE(minor(dev));
 198         int error;
 199         short w;
 200         u_char count;
 201         char c;
 202
 203         if (sc == NULL)
 204                 return (ENXIO);
 205         if (s == NULL)
 206                 return (EINVAL);
 207
 208         parent = device_get_parent(smbdev);
 209
 210         /* Allocate the bus. */
 211         if ((error = smbus_request_bus(parent, smbdev,
 212                         (ap->a_fflag & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
 213                 return (error);
 214
 215         switch (ap->a_cmd) {
 216         case SMB_QUICK_WRITE:
 217                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
 218                 break;
 219
 220         case SMB_QUICK_READ:
 221                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
 222                 break;
 223
 224         case SMB_SENDB:
 225                 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
 226                 break;
 227
 228         case SMB_RECVB:
 229                 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
 230                 break;
 231
 232         case SMB_WRITEB:
 233                 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
 234                                                 s->data.byte));
 235                 break;
 236
 237         case SMB_WRITEW:
 238                 error = smbus_error(smbus_writew(parent, s->slave,
 239                                                 s->cmd, s->data.word));
 240                 break;
 241
 242         case SMB_READB:
 243                 if (s->data.byte_ptr) {
 244                         error = smbus_error(smbus_readb(parent, s->slave,
 245                                                 s->cmd, &c));
 246                         if (error)
 247                                 break;
 248                         error = copyout(&c, s->data.byte_ptr,
 249                                         sizeof(*(s->data.byte_ptr)));
 250                 }
 251                 break;
 252
 253         case SMB_READW:
 254                 if (s->data.word_ptr) {
 255                         error = smbus_error(smbus_readw(parent, s->slave,
 256                                                 s->cmd, &w));
 257                         if (error == 0) {
 258                                 error = copyout(&w, s->data.word_ptr,
 259                                                 sizeof(*(s->data.word_ptr)));
 260                         }
 261                 }
 262                 break;
 263
 264         case SMB_PCALL:
 265                 if (s->data.process.rdata) {
 266                         error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
 267                                 s->data.process.sdata, &w));
 268                         if (error)
 269                                 break;
 270                         error = copyout(&w, s->data.process.rdata,
 271                                         sizeof(*(s->data.process.rdata)));
 272                 }
 273
 274                 break;
 275
 276         case SMB_BWRITE:
 277                 if (s->count && s->data.byte_ptr) {
 278                         if (s->count > SMB_MAXBLOCKSIZE)
 279                                 s->count = SMB_MAXBLOCKSIZE;
 280                         error = copyin(s->data.byte_ptr, buf, s->count);
 281                         if (error)
 282                                 break;
 283                         error = smbus_error(smbus_bwrite(parent, s->slave,
 284                                                 s->cmd, s->count, buf));
 285                 }
 286                 break;
 287
 288         case SMB_OLD_BREAD:
 289         case SMB_BREAD:
 290                 if (s->count && s->data.byte_ptr) {
 291                         count = min(s->count, SMB_MAXBLOCKSIZE);
 292                         error = smbus_error(smbus_bread(parent, s->slave,
 293                                                 s->cmd, &count, buf));
 294                         if (error)
 295                                 break;
 296                         error = copyout(buf, s->data.byte_ptr,
 297                             min(count, s->count));
 298                         s->count = count;
 299                 }
 300                 break;
 301
 302         default:
 303                 error = ENOTTY;
 304         }
 305
 306         smbus_release_bus(parent, smbdev);
 307
 308         return (error);
 309 }
 310
 311 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, NULL, NULL);
 312 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
 313 MODULE_VERSION(smb, 1);