diff options
Diffstat (limited to 'sys/dev/iicbus/iic.c')
| -rw-r--r-- | sys/dev/iicbus/iic.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/sys/dev/iicbus/iic.c b/sys/dev/iicbus/iic.c new file mode 100644 index 0000000..0a6831b --- /dev/null +++ b/sys/dev/iicbus/iic.c @@ -0,0 +1,278 @@ +/*- + * 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 <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 = { + /* 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); |
