/*- * 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: src/sys/dev/iicbus/iic.c,v 1.18 1999/11/18 05:43:32 peter Exp $ * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.7 2004/05/19 22:52:38 dillon Exp $ * */ #include #include #include #include #include #include #include #include #include #include #include #include "iiconf.h" #include "iicbus.h" #include #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 = { /* name */ "iic", /* maj */ CDEV_MAJOR, /* flags */ 0, /* port */ NULL, /* clone */ NULL, /* open */ iicopen, /* close */ iicclose, /* read */ iicread, /* write */ iicwrite, /* ioctl */ iicioctl, /* poll */ nopoll, /* mmap */ nommap, /* strategy */ nostrategy, /* dump */ nodump, /* psize */ nopsize }; /* * 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) { cdevsw_add(&iic_cdevsw, -1, device_get_unit(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 thread *td) { 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 thread *td) { 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 thread *td) { 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);