/*-
* Copyright (c) 1998 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.
*
* $Id: iic.c,v 1.8 1999/05/07 10:09:46 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/buf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>
#include <machine/clock.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include <machine/iic.h>
#include "iicbus_if.h"
#define BUFSIZE 1024
struct iic_softc {
u_char sc_addr; /* address on iicbus */
int sc_count; /* >0 if device opened */
char sc_buffer[BUFSIZE]; /* output buffer */
char sc_inbuf[BUFSIZE]; /* input buffer */
};
#define IIC_SOFTC(unit) \
((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
#define IIC_DEVICE(unit) \
(devclass_get_device(iic_devclass, (unit)))
static int iic_probe(device_t);
static int iic_attach(device_t);
static devclass_t iic_devclass;
static device_method_t iic_methods[] = {
/* device interface */
DEVMETHOD(device_probe, iic_probe),
DEVMETHOD(device_attach, iic_attach),
/* iicbus interface */
DEVMETHOD(iicbus_intr, iicbus_generic_intr),
{ 0, 0 }
};
static driver_t iic_driver = {
"iic",
iic_methods,
sizeof(struct iic_softc),
};
static d_open_t iicopen;
static d_close_t iicclose;
static d_write_t iicwrite;
static d_read_t iicread;
static d_ioctl_t iicioctl;
#define CDEV_MAJOR 105
static struct cdevsw iic_cdevsw =
{ iicopen, iicclose, iicread, iicwrite, /*105*/
iicioctl, nullstop, nullreset, nodevtotty, /*iic*/
seltrue, nommap, nostrat, "iic", NULL, -1 };
/*
* iicprobe()
*/
static int
iic_probe(device_t dev)
{
struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
sc->sc_addr = iicbus_get_addr(dev);
/* XXX detect chip with start/stop conditions */
return (0);
}
/*
* iicattach()
*/
static int
iic_attach(device_t dev)
{
return (0);
}
static int
iicopen (dev_t dev, int flags, int fmt, struct proc *p)
{
struct iic_softc *sc = IIC_SOFTC(minor(dev));
if (!sc)
return (EINVAL);
if (sc->sc_count > 0)
return (EBUSY);
sc->sc_count++;
return (0);
}
static int
iicclose(dev_t dev, int flags, int fmt, struct proc *p)
{
struct iic_softc *sc = IIC_SOFTC(minor(dev));
if (!sc)
return (EINVAL);
if (!sc->sc_count)
return (EINVAL);
sc->sc_count--;
if (sc->sc_count < 0)
panic("%s: iic_count < 0!", __FUNCTION__);
return (0);
}
static int
iicwrite(dev_t dev, struct uio * uio, int ioflag)
{
device_t iicdev = IIC_DEVICE(minor(dev));
struct iic_softc *sc = IIC_SOFTC(minor(dev));
int sent, error, count;
if (!sc || !iicdev)
return (EINVAL);
if (sc->sc_count == 0)
return (EINVAL);
if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
return (error);
count = min(uio->uio_resid, BUFSIZE);
uiomove(sc->sc_buffer, count, uio);
error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
sc->sc_buffer, count, &sent);
iicbus_release_bus(device_get_parent(iicdev), iicdev);
return(error);
}
static int
iicread(dev_t dev, struct uio * uio, int ioflag)
{
device_t iicdev = IIC_DEVICE(minor(dev));
struct iic_softc *sc = IIC_SOFTC(minor(dev));
int len, error = 0;
int bufsize;
if (!sc || !iicdev)
return (EINVAL);
if (sc->sc_count == 0)
return (EINVAL);
if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
return (error);
/* max amount of data to read */
len = min(uio->uio_resid, BUFSIZE);
if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
sc->sc_inbuf, len, &bufsize)))
return (error);
if (bufsize > uio->uio_resid)
panic("%s: too much data read!", __FUNCTION__);
iicbus_release_bus(device_get_parent(iicdev), iicdev);
return (uiomove(sc->sc_inbuf, bufsize, uio));
}
static int
iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
device_t iicdev = IIC_DEVICE(minor(dev));
struct iic_softc *sc = IIC_SOFTC(minor(dev));
device_t parent = device_get_parent(iicdev);
struct iiccmd *s = (struct iiccmd *)data;
int error, count;
if (!sc)
return (EINVAL);
if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
(flags & O_NONBLOCK) ? IIC_DONTWAIT :
(IIC_WAIT | IIC_INTR))))
return (error);
switch (cmd) {
case I2CSTART:
error = iicbus_start(parent, s->slave, 0);
break;
case I2CSTOP:
error = iicbus_stop(parent);
break;
case I2CRSTCARD:
error = iicbus_reset(parent, 0, 0, NULL);
break;
case I2CWRITE:
error = iicbus_write(parent, s->buf, s->count, &count, 0);
break;
case I2CREAD:
error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
break;
default:
error = ENODEV;
}
iicbus_release_bus(device_get_parent(iicdev), iicdev);
return (error);
}
static int iic_devsw_installed = 0;
static void
iic_drvinit(void *unused)
{
dev_t dev;
if( ! iic_devsw_installed ) {
dev = makedev(CDEV_MAJOR,0);
cdevsw_add(&dev,&iic_cdevsw,NULL);
iic_devsw_installed = 1;
}
}
DEV_DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, CDEV_MAJOR,
NODEV, iic_cdevsw, 0, 0);
SYSINIT(iicdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,iic_drvinit,NULL)
