278 lines
6.2 KiB
C
278 lines
6.2 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
#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/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 = {
|
|
/* open */ iicopen,
|
|
/* close */ iicclose,
|
|
/* read */ iicread,
|
|
/* write */ iicwrite,
|
|
/* ioctl */ iicioctl,
|
|
/* poll */ nopoll,
|
|
/* mmap */ nommap,
|
|
/* strategy */ nostrategy,
|
|
/* name */ "iic",
|
|
/* maj */ CDEV_MAJOR,
|
|
/* dump */ nodump,
|
|
/* psize */ nopsize,
|
|
/* flags */ 0,
|
|
/* bmaj */ -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)
|
|
{
|
|
make_dev(&iic_cdevsw, device_get_unit(dev), /* XXX cleanup */
|
|
UID_ROOT, GID_WHEEL,
|
|
0600, "iic%d", device_get_unit(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);
|
|
}
|
|
|
|
DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);
|