sys/bus/smbus/smb.c

   1 /*-
   2  * Copyright (c) 1998 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 1.20 1999/11/18 05:44:56 peter Exp $
  27  * $DragonFly: src/sys/bus/smbus/smb.c,v 1.9 2006/09/10 01:26:33 dillon Exp $
  28  *
  29  */
  30 #include <sys/param.h>
  31 #include <sys/kernel.h>
  32 #include <sys/systm.h>
  33 #include <sys/module.h>
  34 #include <sys/bus.h>
  35 #include <sys/conf.h>
  36 #include <sys/buf.h>
  37 #include <sys/uio.h>
  38 #include <sys/malloc.h>
  39 #include <sys/fcntl.h>
  40
  41 #include <machine/clock.h>
  42
  43 #include "smbconf.h"
  44 #include "smbus.h"
  45 #include <machine/smb.h>
  46
  47 #include "smbus_if.h"
  48
  49 #define BUFSIZE 1024
  50
  51 struct smb_softc {
  52
  53         int sc_addr;                    /* address on smbus */
  54         int sc_count;                   /* >0 if device opened */
  55
  56         char *sc_cp;                    /* output buffer pointer */
  57
  58         char sc_buffer[BUFSIZE];        /* output buffer */
  59         char sc_inbuf[BUFSIZE];         /* input buffer */
  60 };
  61
  62 #define IIC_SOFTC(unit) \
  63         ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit)))
  64
  65 #define IIC_DEVICE(unit) \
  66         (devclass_get_device(smb_devclass, (unit)))
  67
  68 static int smb_probe(device_t);
  69 static int smb_attach(device_t);
  70
  71 static devclass_t smb_devclass;
  72
  73 static device_method_t smb_methods[] = {
  74         /* device interface */
  75         DEVMETHOD(device_probe,         smb_probe),
  76         DEVMETHOD(device_attach,        smb_attach),
  77
  78         /* smbus interface */
  79         DEVMETHOD(smbus_intr,           smbus_generic_intr),
  80
  81         { 0, 0 }
  82 };
  83
  84 static driver_t smb_driver = {
  85         "smb",
  86         smb_methods,
  87         sizeof(struct smb_softc),
  88 };
  89
  90 static  d_open_t        smbopen;
  91 static  d_close_t       smbclose;
  92 static  d_write_t       smbwrite;
  93 static  d_read_t        smbread;
  94 static  d_ioctl_t       smbioctl;
  95
  96 #define CDEV_MAJOR 106
  97 static struct dev_ops smb_ops = {
  98         { "smb", CDEV_MAJOR, 0 },
  99         .d_open =       smbopen,
 100         .d_close =      smbclose,
 101         .d_read =       smbread,
 102         .d_write =      smbwrite,
 103         .d_ioctl =      smbioctl,
 104 };
 105
 106 /*
 107  * smbprobe()
 108  */
 109 static int
 110 smb_probe(device_t dev)
 111 {
 112         struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
 113
 114         sc->sc_addr = smbus_get_addr(dev);
 115
 116         /* XXX detect chip with start/stop conditions */
 117
 118         return (0);
 119 }
 120
 121 /*
 122  * smbattach()
 123  */
 124 static int
 125 smb_attach(device_t dev)
 126 {
 127         dev_ops_add(&smb_ops, -1, device_get_unit(dev));
 128         make_dev(&smb_ops, device_get_unit(dev),        /* XXX cleanup */
 129                         UID_ROOT, GID_WHEEL,
 130                         0600, "smb%d", device_get_unit(dev));
 131         return (0);
 132 }
 133
 134 static int
 135 smbopen (struct dev_open_args *ap)
 136 {
 137         cdev_t dev = ap->a_head.a_dev;
 138         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 139
 140         if (!sc)
 141                 return (EINVAL);
 142
 143         if (sc->sc_count)
 144                 return (EBUSY);
 145
 146         sc->sc_count++;
 147
 148         return (0);
 149 }
 150
 151 static int
 152 smbclose(struct dev_close_args *ap)
 153 {
 154         cdev_t dev = ap->a_head.a_dev;
 155         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 156
 157         if (!sc)
 158                 return (EINVAL);
 159
 160         if (!sc->sc_count)
 161                 return (EINVAL);
 162
 163         sc->sc_count--;
 164
 165         return (0);
 166 }
 167
 168 static int
 169 smbwrite(struct dev_write_args *ap)
 170 {
 171         return (EINVAL);
 172 }
 173
 174 static int
 175 smbread(struct dev_read_args *ap)
 176 {
 177         return (EINVAL);
 178 }
 179
 180 static int
 181 smbioctl(struct dev_ioctl_args *ap)
 182 {
 183         cdev_t dev = ap->a_head.a_dev;
 184         device_t smbdev = IIC_DEVICE(minor(dev));
 185         struct smb_softc *sc = IIC_SOFTC(minor(dev));
 186         device_t parent = device_get_parent(smbdev);
 187
 188         int error = 0;
 189         struct smbcmd *s = (struct smbcmd *)ap->a_data;
 190
 191         if (!sc || !s)
 192                 return (EINVAL);
 193
 194         /* allocate the bus */
 195         if ((error = smbus_request_bus(parent, smbdev,
 196                         (ap->a_fflag & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
 197                 return (error);
 198
 199         switch (ap->a_cmd) {
 200         case SMB_QUICK_WRITE:
 201                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
 202                 break;
 203
 204         case SMB_QUICK_READ:
 205                 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
 206                 break;
 207
 208         case SMB_SENDB:
 209                 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
 210                 break;
 211
 212         case SMB_RECVB:
 213                 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
 214                 break;
 215
 216         case SMB_WRITEB:
 217                 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
 218                                                 s->data.byte));
 219                 break;
 220
 221         case SMB_WRITEW:
 222                 error = smbus_error(smbus_writew(parent, s->slave,
 223                                                 s->cmd, s->data.word));
 224                 break;
 225
 226         case SMB_READB:
 227                 if (s->data.byte_ptr)
 228                         error = smbus_error(smbus_readb(parent, s->slave,
 229                                                 s->cmd, s->data.byte_ptr));
 230                 break;
 231
 232         case SMB_READW:
 233                 if (s->data.word_ptr)
 234                         error = smbus_error(smbus_readw(parent, s->slave,
 235                                                 s->cmd, s->data.word_ptr));
 236                 break;
 237
 238         case SMB_PCALL:
 239                 if (s->data.process.rdata)
 240                         error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
 241                                 s->data.process.sdata, s->data.process.rdata));
 242                 break;
 243
 244         case SMB_BWRITE:
 245                 if (s->count && s->data.byte_ptr)
 246                         error = smbus_error(smbus_bwrite(parent, s->slave,
 247                                                 s->cmd, s->count, s->data.byte_ptr));
 248                 break;
 249
 250         case SMB_BREAD:
 251                 if (s->count && s->data.byte_ptr)
 252                         error = smbus_error(smbus_bread(parent, s->slave,
 253                                                 s->cmd, s->count, s->data.byte_ptr));
 254                 break;
 255
 256         default:
 257                 error = ENODEV;
 258         }
 259
 260         /* release the bus */
 261         smbus_release_bus(parent, smbdev);
 262
 263         return (error);
 264 }
 265
 266 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);