sys/bus/iicbus/iic.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/iicbus/iic.c,v 1.18 1999/11/18 05:43:32 peter Exp $
  27  * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.10 2006/09/10 01:26:32 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 "iiconf.h"
  44 #include "iicbus.h"
  45
  46 #include <machine/iic.h>
  47
  48 #include "iicbus_if.h"
  49
  50 #define BUFSIZE 1024
  51
  52 struct iic_softc {
  53
  54         u_char sc_addr;                 /* address on iicbus */
  55         int sc_count;                   /* >0 if device opened */
  56
  57         char sc_buffer[BUFSIZE];        /* output buffer */
  58         char sc_inbuf[BUFSIZE];         /* input buffer */
  59 };
  60
  61 #define IIC_SOFTC(unit) \
  62         ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
  63
  64 #define IIC_DEVICE(unit) \
  65         (devclass_get_device(iic_devclass, (unit)))
  66
  67 static int iic_probe(device_t);
  68 static int iic_attach(device_t);
  69
  70 static devclass_t iic_devclass;
  71
  72 static device_method_t iic_methods[] = {
  73         /* device interface */
  74         DEVMETHOD(device_probe,         iic_probe),
  75         DEVMETHOD(device_attach,        iic_attach),
  76
  77         /* iicbus interface */
  78         DEVMETHOD(iicbus_intr,          iicbus_generic_intr),
  79
  80         { 0, 0 }
  81 };
  82
  83 static driver_t iic_driver = {
  84         "iic",
  85         iic_methods,
  86         sizeof(struct iic_softc),
  87 };
  88
  89 static  d_open_t        iicopen;
  90 static  d_close_t       iicclose;
  91 static  d_write_t       iicwrite;
  92 static  d_read_t        iicread;
  93 static  d_ioctl_t       iicioctl;
  94
  95 #define CDEV_MAJOR 105
  96 static struct dev_ops iic_ops = {
  97         { "iic", CDEV_MAJOR, 0 },
  98         .d_open =       iicopen,
  99         .d_close =      iicclose,
 100         .d_read =       iicread,
 101         .d_write =      iicwrite,
 102         .d_ioctl =      iicioctl,
 103 };
 104
 105 /*
 106  * iicprobe()
 107  */
 108 static int
 109 iic_probe(device_t dev)
 110 {
 111         struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
 112
 113         sc->sc_addr = iicbus_get_addr(dev);
 114
 115         /* XXX detect chip with start/stop conditions */
 116
 117         return (0);
 118 }
 119
 120 /*
 121  * iicattach()
 122  */
 123 static int
 124 iic_attach(device_t dev)
 125 {
 126         make_dev(&iic_ops, device_get_unit(dev),        /* XXX cleanup */
 127                         UID_ROOT, GID_WHEEL,
 128                         0600, "iic%d", device_get_unit(dev));
 129         return (0);
 130 }
 131
 132 static int
 133 iicopen (struct dev_open_args *ap)
 134 {
 135         cdev_t dev = ap->a_head.a_dev;
 136         struct iic_softc *sc = IIC_SOFTC(minor(dev));
 137
 138         if (!sc)
 139                 return (EINVAL);
 140
 141         if (sc->sc_count > 0)
 142                 return (EBUSY);
 143
 144         sc->sc_count++;
 145
 146         return (0);
 147 }
 148
 149 static int
 150 iicclose(struct dev_close_args *ap)
 151 {
 152         cdev_t dev = ap->a_head.a_dev;
 153         struct iic_softc *sc = IIC_SOFTC(minor(dev));
 154
 155         if (!sc)
 156                 return (EINVAL);
 157
 158         if (!sc->sc_count)
 159                 return (EINVAL);
 160
 161         sc->sc_count--;
 162
 163         if (sc->sc_count < 0)
 164                 panic("%s: iic_count < 0!", __func__);
 165
 166         return (0);
 167 }
 168
 169 static int
 170 iicwrite(struct dev_write_args *ap)
 171 {
 172         cdev_t dev = ap->a_head.a_dev;
 173         struct uio *uio = ap->a_uio;
 174         device_t iicdev = IIC_DEVICE(minor(dev));
 175         struct iic_softc *sc = IIC_SOFTC(minor(dev));
 176         int sent, error, count;
 177
 178         if (!sc || !iicdev)
 179                 return (EINVAL);
 180
 181         if (sc->sc_count == 0)
 182                 return (EINVAL);
 183
 184         if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
 185                 return (error);
 186
 187         count = (int)szmin(uio->uio_resid, BUFSIZE);
 188         uiomove(sc->sc_buffer, (size_t)count, uio);
 189
 190         error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
 191                                         sc->sc_buffer, count, &sent);
 192
 193         iicbus_release_bus(device_get_parent(iicdev), iicdev);
 194
 195         return(error);
 196 }
 197
 198 static int
 199 iicread(struct dev_read_args *ap)
 200 {
 201         cdev_t dev = ap->a_head.a_dev;
 202         struct uio *uio = ap->a_uio;
 203         device_t iicdev = IIC_DEVICE(minor(dev));
 204         struct iic_softc *sc = IIC_SOFTC(minor(dev));
 205         int len, error = 0;
 206         int bufsize;
 207
 208         if (!sc || !iicdev)
 209                 return (EINVAL);
 210
 211         if (sc->sc_count == 0)
 212                 return (EINVAL);
 213
 214         if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
 215                 return (error);
 216
 217         /* max amount of data to read */
 218         len = (int)szmin(uio->uio_resid, BUFSIZE);
 219
 220         if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
 221                                         sc->sc_inbuf, len, &bufsize)))
 222                 return (error);
 223
 224         if (bufsize > uio->uio_resid)
 225                 panic("%s: too much data read!", __func__);
 226
 227         iicbus_release_bus(device_get_parent(iicdev), iicdev);
 228
 229         return (uiomove(sc->sc_inbuf, (size_t)bufsize, uio));
 230 }
 231
 232 static int
 233 iicioctl(struct dev_ioctl_args *ap)
 234 {
 235         cdev_t dev = ap->a_head.a_dev;
 236         device_t iicdev = IIC_DEVICE(minor(dev));
 237         struct iic_softc *sc = IIC_SOFTC(minor(dev));
 238         device_t parent = device_get_parent(iicdev);
 239         struct iiccmd *s = (struct iiccmd *)ap->a_data;
 240         int error, count;
 241
 242         if (!sc)
 243                 return (EINVAL);
 244
 245         if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
 246                         (ap->a_fflag & O_NONBLOCK) ? IIC_DONTWAIT :
 247                                                 (IIC_WAIT | IIC_INTR))))
 248                 return (error);
 249
 250         switch (ap->a_cmd) {
 251         case I2CSTART:
 252                 error = iicbus_start(parent, s->slave, 0);
 253                 break;
 254
 255         case I2CSTOP:
 256                 error = iicbus_stop(parent);
 257                 break;
 258
 259         case I2CRSTCARD:
 260                 error = iicbus_reset(parent, 0, 0, NULL);
 261                 break;
 262
 263         case I2CWRITE:
 264                 error = iicbus_write(parent, s->buf, s->count, &count, 0);
 265                 break;
 266
 267         case I2CREAD:
 268                 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
 269                 break;
 270
 271         default:
 272                 error = ENODEV;
 273         }
 274
 275         iicbus_release_bus(device_get_parent(iicdev), iicdev);
 276
 277         return (error);
 278 }
 279
 280 DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);