add37e1e86
properly using copyin/copyout for more than 5 years? This one did. :-)
Properly encapsulate all user<->kernel data transfers using copy{in,out}.
MFC after: 1 month
311 lines
6.8 KiB
C
311 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/smbus/smbconf.h>
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#include <dev/smbus/smbus.h>
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#include <dev/smbus/smb.h>
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#include "smbus_if.h"
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#define BUFSIZE 1024
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struct smb_softc {
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int sc_count; /* >0 if device opened */
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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 smb_softc *)devclass_get_softc(smb_devclass, (unit)))
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#define IIC_DEVICE(unit) \
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(devclass_get_device(smb_devclass, (unit)))
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static int smb_probe(device_t);
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static int smb_attach(device_t);
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static int smb_detach(device_t);
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static void smb_identify(driver_t *driver, device_t parent);
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static devclass_t smb_devclass;
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static device_method_t smb_methods[] = {
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/* device interface */
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DEVMETHOD(device_identify, smb_identify),
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DEVMETHOD(device_probe, smb_probe),
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DEVMETHOD(device_attach, smb_attach),
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DEVMETHOD(device_detach, smb_detach),
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/* smbus interface */
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DEVMETHOD(smbus_intr, smbus_generic_intr),
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{ 0, 0 }
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};
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static driver_t smb_driver = {
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"smb",
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smb_methods,
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sizeof(struct smb_softc),
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};
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static d_open_t smbopen;
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static d_close_t smbclose;
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static d_write_t smbwrite;
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static d_read_t smbread;
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static d_ioctl_t smbioctl;
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static struct cdevsw smb_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = smbopen,
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.d_close = smbclose,
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.d_read = smbread,
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.d_write = smbwrite,
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.d_ioctl = smbioctl,
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.d_name = "smb",
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};
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static void
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smb_identify(driver_t *driver, device_t parent)
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{
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BUS_ADD_CHILD(parent, 0, "smb", -1);
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}
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static int
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smb_probe(device_t dev)
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{
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device_set_desc(dev, "SMBus generic I/O");
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return (0);
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}
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static int
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smb_attach(device_t dev)
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{
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struct smb_softc *sc = (struct smb_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 smb_softc *));
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sc->sc_devnode = make_dev(&smb_cdevsw, device_get_unit(dev),
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UID_ROOT, GID_WHEEL,
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0600, "smb%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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smb_detach(device_t dev)
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{
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struct smb_softc *sc = (struct smb_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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smbopen (dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct smb_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 (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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smbclose(dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct smb_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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return (0);
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}
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static int
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smbwrite(dev_t dev, struct uio * uio, int ioflag)
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{
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/* not supported */
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return (EINVAL);
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}
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static int
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smbread(dev_t dev, struct uio * uio, int ioflag)
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{
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/* not supported */
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return (EINVAL);
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}
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static int
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smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
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{
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device_t smbdev = IIC_DEVICE(minor(dev));
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struct smb_softc *sc = IIC_SOFTC(minor(dev));
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device_t parent = device_get_parent(smbdev);
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char buf[SMB_MAXBLOCKSIZE];
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char c;
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short w;
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int error = 0;
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struct smbcmd *s = (struct smbcmd *)data;
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if (!sc || !s)
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return (EINVAL);
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/* allocate the bus */
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if ((error = smbus_request_bus(parent, smbdev,
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(flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
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return (error);
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switch (cmd) {
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case SMB_QUICK_WRITE:
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error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
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break;
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case SMB_QUICK_READ:
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error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
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break;
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case SMB_SENDB:
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error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
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break;
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case SMB_RECVB:
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error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
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break;
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case SMB_WRITEB:
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error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
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s->data.byte));
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break;
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case SMB_WRITEW:
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error = smbus_error(smbus_writew(parent, s->slave,
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s->cmd, s->data.word));
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break;
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case SMB_READB:
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if (s->data.byte_ptr) {
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error = smbus_error(smbus_readb(parent, s->slave,
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s->cmd, &c));
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if (error)
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break;
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error = copyout(&c, s->data.byte_ptr,
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sizeof(*(s->data.byte_ptr)));
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}
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break;
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case SMB_READW:
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if (s->data.word_ptr) {
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error = smbus_error(smbus_readw(parent, s->slave,
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s->cmd, &w));
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if (error == 0) {
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error = copyout(&w, s->data.word_ptr,
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sizeof(*(s->data.word_ptr)));
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}
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}
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break;
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case SMB_PCALL:
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if (s->data.process.rdata) {
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error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
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s->data.process.sdata, &w));
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if (error)
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break;
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error = copyout(&w, s->data.process.rdata,
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sizeof(*(s->data.process.rdata)));
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}
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break;
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case SMB_BWRITE:
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if (s->count && s->data.byte_ptr) {
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if (s->count > SMB_MAXBLOCKSIZE)
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s->count = SMB_MAXBLOCKSIZE;
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error = copyin(s->data.byte_ptr, buf, s->count);
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if (error)
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break;
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error = smbus_error(smbus_bwrite(parent, s->slave,
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s->cmd, s->count, buf));
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}
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break;
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case SMB_BREAD:
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if (s->count && s->data.byte_ptr) {
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if (s->count > SMB_MAXBLOCKSIZE)
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s->count = SMB_MAXBLOCKSIZE;
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error = smbus_error(smbus_bread(parent, s->slave,
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s->cmd, s->count, buf));
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if (error)
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break;
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error = copyout(buf, s->data.byte_ptr, s->count);
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}
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break;
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default:
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error = ENOTTY;
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}
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/* release the bus */
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smbus_release_bus(parent, smbdev);
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return (error);
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}
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DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
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MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
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MODULE_VERSION(smb, 1);
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