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300 lines
6.8 KiB
C
300 lines
6.8 KiB
C
/*-
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* Copyright (c) 1998, 2001 Nicolas Souchu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/fcntl.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iic.h>
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#include "iicbus_if.h"
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#define BUFSIZE 1024
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struct iic_softc {
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u_char sc_addr; /* 7 bit address on iicbus */
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int sc_count; /* >0 if device opened */
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char sc_buffer[BUFSIZE]; /* output buffer */
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char sc_inbuf[BUFSIZE]; /* input buffer */
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dev_t sc_devnode;
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};
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#define IIC_SOFTC(unit) \
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((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
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#define IIC_DEVICE(unit) \
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(devclass_get_device(iic_devclass, (unit)))
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static int iic_probe(device_t);
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static int iic_attach(device_t);
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static int iic_detach(device_t);
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static void iic_identify(driver_t *driver, device_t parent);
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static devclass_t iic_devclass;
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static device_method_t iic_methods[] = {
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/* device interface */
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DEVMETHOD(device_identify, iic_identify),
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DEVMETHOD(device_probe, iic_probe),
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DEVMETHOD(device_attach, iic_attach),
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DEVMETHOD(device_detach, iic_detach),
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/* iicbus interface */
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DEVMETHOD(iicbus_intr, iicbus_generic_intr),
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{ 0, 0 }
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};
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static driver_t iic_driver = {
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"iic",
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iic_methods,
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sizeof(struct iic_softc),
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};
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static d_open_t iicopen;
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static d_close_t iicclose;
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static d_write_t iicwrite;
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static d_read_t iicread;
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static d_ioctl_t iicioctl;
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#define CDEV_MAJOR 105
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static struct cdevsw iic_cdevsw = {
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.d_open = iicopen,
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.d_close = iicclose,
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.d_read = iicread,
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.d_write = iicwrite,
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.d_ioctl = iicioctl,
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.d_name = "iic",
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.d_maj = CDEV_MAJOR,
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};
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static void
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iic_identify(driver_t *driver, device_t parent)
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{
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BUS_ADD_CHILD(parent, 0, "iic", -1);
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}
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static int
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iic_probe(device_t dev)
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{
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device_set_desc(dev, "I2C generic I/O");
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return (0);
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}
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static int
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iic_attach(device_t dev)
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{
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struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
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if (!sc)
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return (ENOMEM);
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bzero(sc, sizeof(struct iic_softc));
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sc->sc_devnode = make_dev(&iic_cdevsw, device_get_unit(dev),
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UID_ROOT, GID_WHEEL,
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0600, "iic%d", device_get_unit(dev));
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return (0);
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}
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static int
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iic_detach(device_t dev)
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{
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struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
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if (sc->sc_devnode)
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destroy_dev(sc->sc_devnode);
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return (0);
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}
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static int
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iicopen (dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct iic_softc *sc = IIC_SOFTC(minor(dev));
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if (!sc)
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return (EINVAL);
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if (sc->sc_count > 0)
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return (EBUSY);
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sc->sc_count++;
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return (0);
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}
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static int
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iicclose(dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct iic_softc *sc = IIC_SOFTC(minor(dev));
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if (!sc)
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return (EINVAL);
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if (!sc->sc_count)
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return (EINVAL);
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sc->sc_count--;
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if (sc->sc_count < 0)
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panic("%s: iic_count < 0!", __func__);
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return (0);
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}
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static int
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iicwrite(dev_t dev, struct uio * uio, int ioflag)
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{
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device_t iicdev = IIC_DEVICE(minor(dev));
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struct iic_softc *sc = IIC_SOFTC(minor(dev));
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int sent, error, count;
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if (!sc || !iicdev || !sc->sc_addr)
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return (EINVAL);
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if (sc->sc_count == 0)
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return (EINVAL);
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if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
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return (error);
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count = min(uio->uio_resid, BUFSIZE);
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uiomove(sc->sc_buffer, count, uio);
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error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
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sc->sc_buffer, count, &sent);
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iicbus_release_bus(device_get_parent(iicdev), iicdev);
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return(error);
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}
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static int
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iicread(dev_t dev, struct uio * uio, int ioflag)
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{
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device_t iicdev = IIC_DEVICE(minor(dev));
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struct iic_softc *sc = IIC_SOFTC(minor(dev));
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int len, error = 0;
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int bufsize;
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if (!sc || !iicdev || !sc->sc_addr)
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return (EINVAL);
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if (sc->sc_count == 0)
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return (EINVAL);
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if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
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return (error);
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/* max amount of data to read */
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len = min(uio->uio_resid, BUFSIZE);
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if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
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sc->sc_inbuf, len, &bufsize)))
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return (error);
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if (bufsize > uio->uio_resid)
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panic("%s: too much data read!", __func__);
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iicbus_release_bus(device_get_parent(iicdev), iicdev);
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return (uiomove(sc->sc_inbuf, bufsize, uio));
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}
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static int
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iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
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{
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device_t iicdev = IIC_DEVICE(minor(dev));
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struct iic_softc *sc = IIC_SOFTC(minor(dev));
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device_t parent = device_get_parent(iicdev);
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struct iiccmd *s = (struct iiccmd *)data;
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int error, count;
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if (!sc)
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return (EINVAL);
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if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
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(flags & O_NONBLOCK) ? IIC_DONTWAIT :
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(IIC_WAIT | IIC_INTR))))
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return (error);
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switch (cmd) {
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case I2CSTART:
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error = iicbus_start(parent, s->slave, 0);
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/*
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* Implicitly set the chip addr to the slave addr passed as
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* parameter. Consequently, start/stop shall be called before
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* the read or the write of a block.
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*/
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if (!error)
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sc->sc_addr = s->slave;
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break;
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case I2CSTOP:
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error = iicbus_stop(parent);
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break;
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case I2CRSTCARD:
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error = iicbus_reset(parent, 0, 0, NULL);
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break;
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case I2CWRITE:
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error = iicbus_write(parent, s->buf, s->count, &count, 10);
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break;
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case I2CREAD:
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error = iicbus_read(parent, s->buf, s->count, &count, s->last, 10);
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break;
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default:
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error = ENODEV;
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}
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iicbus_release_bus(device_get_parent(iicdev), iicdev);
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return (error);
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}
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DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);
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MODULE_DEPEND(iic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
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MODULE_VERSION(iic, 1);
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