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  * $DragonFly: src/sys/bus/smbus/smb.c,v 1.9 2006/09/10 01:26:33 dillon Exp $
  28  *
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/kernel.h>
  33 #include <sys/systm.h>
  34 #include <sys/device.h>
  35 #include <sys/module.h>
  36 #include <sys/bus.h>
  37 #include <sys/conf.h>
  38 #include <sys/uio.h>
  39 #include <sys/fcntl.h>
  40
  41 #include "smbconf.h"
  42 #include "smbus.h"
  43 #include "smb.h"
  44
  45 #include "smbus_if.h"
  46
  47 #define BUFSIZE 1024
  48
  49 struct smb_softc {
  50
  51         int sc_count;                   /* >0 if device opened */
  52         cdev_t sc_devnode;
  53 };
  54
  55 #define IIC_SOFTC(unit) \
  56         ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit)))
  57
  58 #define IIC_DEVICE(unit) \
  59         (devclass_get_device(smb_devclass, (unit)))
  60
  61 static void smb_identify(driver_t *driver, device_t parent);
  62 static int smb_probe(device_t);
  63 static int smb_attach(device_t);
  64 static int smb_detach(device_t);
  65
  66 static devclass_t smb_devclass;
  67
  68 static device_method_t smb_methods[] = {
  69         /* device interface */
  70         DEVMETHOD(device_identify,      smb_identify),
  71         DEVMETHOD(device_probe,         smb_probe),
  72         DEVMETHOD(device_attach,        smb_attach),
  73         DEVMETHOD(device_detach,        smb_detach),
  74
  75         /* smbus interface */
  76         DEVMETHOD(smbus_intr,           smbus_generic_intr),
  77
  78         { 0, 0 }
  79 };
  80
  81 static driver_t smb_driver = {
  82         "smb",
  83         smb_methods,
  84         sizeof(struct smb_softc),
  85 };
  86
  87 static  d_open_t        smbopen;
  88 static  d_close_t       smbclose;
  89 static  d_ioctl_t       smbioctl;
  90
  91 #define CDEV_MAJOR 106
  92 static struct dev_ops smb_ops = {
  93         { "smb", CDEV_MAJOR, 0 },
  94         .d_open =       smbopen,
  95         .d_close =      smbclose,
  96         .d_ioctl =      smbioctl,
  97 };
  98
  99 static void
 100 smb_identify(driver_t *driver, device_t parent)
 101 {
 102         if (device_find_child(parent, "smb", -1) == NULL)
 103                 BUS_ADD_CHILD(parent, parent, 0, "smb", -1);
 104 }
 105
 106 static int
 107 smb_probe(device_t dev)
 108 {
 109         device_set_desc(dev, "SMBus generic I/O");
 110
 111         return (0);
 112 }
 113
 114 static int
 115 smb_attach(device_t dev)
 116 {
 117         struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
 118
 119         if (!sc)
 120                 return (ENOMEM);
 121
 122         bzero(sc, sizeof(struct smb_softc *));
 123
 124         sc->sc_devnode = make_dev(&smb_ops, device_get_unit(dev),
 125                         UID_ROOT, GID_WHEEL,
 126                         0600, "smb%d", device_get_unit(dev));
 127
 128         return (0);
 129 }
 130
 131 static int
 132 smb_detach(device_t dev)
 133 {
 134         struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
 135
 136         if (sc->sc_devnode)
 137                 dev_ops_remove_minor(&smb_ops, device_get_unit(dev));
 138
 139         return (0);
 140 }
 141
 142 static int
 143 smbopen (struct dev_open_args *ap)
 144 {
 145         cdev_t dev = ap->a_head.a_dev;
 146         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 147
 148         if (sc == NULL)
 149                 return (ENXIO);
 150
 151         if (sc->sc_count != 0)
 152                 return (EBUSY);
 153
 154         sc->sc_count++;
 155
 156         return (0);
 157 }
 158
 159 static int
 160 smbclose(struct dev_close_args *ap)
 161 {
 162         cdev_t dev = ap->a_head.a_dev;
 163         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 164
 165         if (sc == NULL)
 166                 return (ENXIO);
 167
 168         if (sc->sc_count == 0)
 169                 /* This is not supposed to happen. */
 170                 return (0);
 171
 172         sc->sc_count--;
 173
 174         return (0);
 175 }
 176
 177 #if 0
 178 static int
 179 smbwrite(struct dev_write_args *ap)
 180 {
 181         return (EINVAL);
 182 }
 183
 184 static int
 185 smbread(struct dev_read_args *ap)
 186 {
 187         return (EINVAL);
 188 }
 189 #endif
 190
 191 static int
 192 smbioctl(struct dev_ioctl_args *ap)
 193 {
 194         cdev_t dev = ap->a_head.a_dev;
 195         char buf[SMB_MAXBLOCKSIZE];
 196         device_t parent;
 197         struct smbcmd *s = (struct smbcmd *)ap->a_data;
 198         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 199         device_t smbdev = IIC_DEVICE(minor(dev));
 200         int error;
 201         short w;
 202         u_char count;
 203         char c;
 204
 205         if (sc == NULL)
 206                 return (ENXIO);
 207         if (s == NULL)
 208                 return (EINVAL);
 209
 210         parent = device_get_parent(smbdev);
 211
 212         /* Allocate the bus. */
 213         if ((error = smbus_request_bus(parent, smbdev,
 214                         (ap->a_fflag & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
 215                 return (error);
 216
 217         switch (ap->a_cmd) {
 218         case SMB_QUICK_WRITE:
 219                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
 220                 break;
 221
 222         case SMB_QUICK_READ:
 223                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
 224                 break;
 225
 226         case SMB_SENDB:
 227                 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
 228                 break;
 229
 230         case SMB_RECVB:
 231                 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
 232                 break;
 233
 234         case SMB_WRITEB:
 235                 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
 236                                                 s->data.byte));
 237                 break;
 238
 239         case SMB_WRITEW:
 240                 error = smbus_error(smbus_writew(parent, s->slave,
 241                                                 s->cmd, s->data.word));
 242                 break;
 243
 244         case SMB_READB:
 245                 if (s->data.byte_ptr) {
 246                         error = smbus_error(smbus_readb(parent, s->slave,
 247                                                 s->cmd, &c));
 248                         if (error)
 249                                 break;
 250                         error = copyout(&c, s->data.byte_ptr,
 251                                         sizeof(*(s->data.byte_ptr)));
 252                 }
 253                 break;
 254
 255         case SMB_READW:
 256                 if (s->data.word_ptr) {
 257                         error = smbus_error(smbus_readw(parent, s->slave,
 258                                                 s->cmd, &w));
 259                         if (error == 0) {
 260                                 error = copyout(&w, s->data.word_ptr,
 261                                                 sizeof(*(s->data.word_ptr)));
 262                         }
 263                 }
 264                 break;
 265
 266         case SMB_PCALL:
 267                 if (s->data.process.rdata) {
 268                         error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
 269                                 s->data.process.sdata, &w));
 270                         if (error)
 271                                 break;
 272                         error = copyout(&w, s->data.process.rdata,
 273                                         sizeof(*(s->data.process.rdata)));
 274                 }
 275
 276                 break;
 277
 278         case SMB_BWRITE:
 279                 if (s->count && s->data.byte_ptr) {
 280                         if (s->count > SMB_MAXBLOCKSIZE)
 281                                 s->count = SMB_MAXBLOCKSIZE;
 282                         error = copyin(s->data.byte_ptr, buf, s->count);
 283                         if (error)
 284                                 break;
 285                         error = smbus_error(smbus_bwrite(parent, s->slave,
 286                                                 s->cmd, s->count, buf));
 287                 }
 288                 break;
 289
 290         case SMB_OLD_BREAD:
 291         case SMB_BREAD:
 292                 if (s->count && s->data.byte_ptr) {
 293                         count = min(s->count, SMB_MAXBLOCKSIZE);
 294                         error = smbus_error(smbus_bread(parent, s->slave,
 295                                                 s->cmd, &count, buf));
 296                         if (error)
 297                                 break;
 298                         error = copyout(buf, s->data.byte_ptr,
 299                             min(count, s->count));
 300                         s->count = count;
 301                 }
 302                 break;
 303
 304         default:
 305                 error = ENOTTY;
 306         }
 307
 308         smbus_release_bus(parent, smbdev);
 309
 310         return (error);
 311 }
 312
 313 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
 314 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
 315 MODULE_VERSION(smb, 1);