FreeBSD-5.3/sys/dev/smbus/smb.c
/*-
* Copyright (c) 1998, 2001 Nicolas Souchu
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/sys/dev/smbus/smb.c,v 1.34 2004/06/16 09:46:56 phk Exp $
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/fcntl.h>
#include <dev/smbus/smbconf.h>
#include <dev/smbus/smbus.h>
#include <dev/smbus/smb.h>
#include "smbus_if.h"
#define BUFSIZE 1024
struct smb_softc {
int sc_count; /* >0 if device opened */
struct cdev *sc_devnode;
};
#define IIC_SOFTC(unit) \
((struct smb_softc *)devclass_get_softc(smb_devclass, (unit)))
#define IIC_DEVICE(unit) \
(devclass_get_device(smb_devclass, (unit)))
static int smb_probe(device_t);
static int smb_attach(device_t);
static int smb_detach(device_t);
static void smb_identify(driver_t *driver, device_t parent);
static devclass_t smb_devclass;
static device_method_t smb_methods[] = {
/* device interface */
DEVMETHOD(device_identify, smb_identify),
DEVMETHOD(device_probe, smb_probe),
DEVMETHOD(device_attach, smb_attach),
DEVMETHOD(device_detach, smb_detach),
/* smbus interface */
DEVMETHOD(smbus_intr, smbus_generic_intr),
{ 0, 0 }
};
static driver_t smb_driver = {
"smb",
smb_methods,
sizeof(struct smb_softc),
};
static d_open_t smbopen;
static d_close_t smbclose;
static d_ioctl_t smbioctl;
static struct cdevsw smb_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = smbopen,
.d_close = smbclose,
.d_ioctl = smbioctl,
.d_name = "smb",
};
static void
smb_identify(driver_t *driver, device_t parent)
{
BUS_ADD_CHILD(parent, 0, "smb", -1);
}
static int
smb_probe(device_t dev)
{
device_set_desc(dev, "SMBus generic I/O");
return (0);
}
static int
smb_attach(device_t dev)
{
struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
if (!sc)
return (ENOMEM);
bzero(sc, sizeof(struct smb_softc *));
sc->sc_devnode = make_dev(&smb_cdevsw, device_get_unit(dev),
UID_ROOT, GID_WHEEL,
0600, "smb%d", device_get_unit(dev));
return (0);
}
static int
smb_detach(device_t dev)
{
struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
if (sc->sc_devnode)
destroy_dev(sc->sc_devnode);
return (0);
}
static int
smbopen (struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct smb_softc *sc = IIC_SOFTC(minor(dev));
if (sc == NULL)
return (ENXIO);
if (sc->sc_count != 0)
return (EBUSY);
sc->sc_count++;
return (0);
}
static int
smbclose(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct smb_softc *sc = IIC_SOFTC(minor(dev));
if (sc == NULL)
return (ENXIO);
if (sc->sc_count == 0)
/* This is not supposed to happen. */
return (0);
sc->sc_count--;
return (0);
}
static int
smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
{
char buf[SMB_MAXBLOCKSIZE];
device_t parent;
struct smbcmd *s = (struct smbcmd *)data;
struct smb_softc *sc = IIC_SOFTC(minor(dev));
device_t smbdev = IIC_DEVICE(minor(dev));
int error;
short w;
char c;
if (sc == NULL)
return (ENXIO);
if (s == NULL)
return (EINVAL);
parent = device_get_parent(smbdev);
/* Allocate the bus. */
if ((error = smbus_request_bus(parent, smbdev,
(flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
return (error);
switch (cmd) {
case SMB_QUICK_WRITE:
error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
break;
case SMB_QUICK_READ:
error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
break;
case SMB_SENDB:
error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
break;
case SMB_RECVB:
error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
break;
case SMB_WRITEB:
error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
s->data.byte));
break;
case SMB_WRITEW:
error = smbus_error(smbus_writew(parent, s->slave,
s->cmd, s->data.word));
break;
case SMB_READB:
if (s->data.byte_ptr) {
error = smbus_error(smbus_readb(parent, s->slave,
s->cmd, &c));
if (error)
break;
error = copyout(&c, s->data.byte_ptr,
sizeof(*(s->data.byte_ptr)));
}
break;
case SMB_READW:
if (s->data.word_ptr) {
error = smbus_error(smbus_readw(parent, s->slave,
s->cmd, &w));
if (error == 0) {
error = copyout(&w, s->data.word_ptr,
sizeof(*(s->data.word_ptr)));
}
}
break;
case SMB_PCALL:
if (s->data.process.rdata) {
error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
s->data.process.sdata, &w));
if (error)
break;
error = copyout(&w, s->data.process.rdata,
sizeof(*(s->data.process.rdata)));
}
break;
case SMB_BWRITE:
if (s->count && s->data.byte_ptr) {
if (s->count > SMB_MAXBLOCKSIZE)
s->count = SMB_MAXBLOCKSIZE;
error = copyin(s->data.byte_ptr, buf, s->count);
if (error)
break;
error = smbus_error(smbus_bwrite(parent, s->slave,
s->cmd, s->count, buf));
}
break;
case SMB_BREAD:
if (s->count && s->data.byte_ptr) {
if (s->count > SMB_MAXBLOCKSIZE)
s->count = SMB_MAXBLOCKSIZE;
error = smbus_error(smbus_bread(parent, s->slave,
s->cmd, s->count, buf));
if (error)
break;
error = copyout(buf, s->data.byte_ptr, s->count);
}
break;
default:
error = ENOTTY;
}
smbus_release_bus(parent, smbdev);
return (error);
}
DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
MODULE_VERSION(smb, 1);