501 lines
11 KiB
C
501 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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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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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/sx.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <sys/errno.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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struct iic_softc {
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device_t sc_dev;
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struct cdev *sc_devnode;
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};
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struct iic_cdevpriv {
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struct sx lock;
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struct iic_softc *sc;
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bool started;
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uint8_t addr;
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};
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#define IIC_LOCK(cdp) sx_xlock(&(cdp)->lock)
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#define IIC_UNLOCK(cdp) sx_xunlock(&(cdp)->lock)
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static MALLOC_DEFINE(M_IIC, "iic", "I2C device data");
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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 void iicdtor(void *data);
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static int iicuio_move(struct iic_cdevpriv *priv, struct uio *uio, int last);
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static int iicuio(struct cdev *dev, struct uio *uio, int ioflag);
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static int iicrdwr(struct iic_cdevpriv *priv, struct iic_rdwr_data *d, int flags);
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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_ioctl_t iicioctl;
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static struct cdevsw iic_cdevsw = {
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.d_version = D_VERSION,
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.d_open = iicopen,
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.d_read = iicuio,
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.d_write = iicuio,
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.d_ioctl = iicioctl,
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.d_name = "iic",
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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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if (device_find_child(parent, "iic", -1) == NULL)
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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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if (iicbus_get_addr(dev) > 0)
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return (ENXIO);
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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;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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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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if (sc->sc_devnode == NULL) {
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device_printf(dev, "failed to create character device\n");
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return (ENXIO);
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}
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sc->sc_devnode->si_drv1 = sc;
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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;
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sc = 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(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct iic_cdevpriv *priv;
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int error;
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priv = malloc(sizeof(*priv), M_IIC, M_WAITOK | M_ZERO);
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sx_init(&priv->lock, "iic");
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priv->sc = dev->si_drv1;
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error = devfs_set_cdevpriv(priv, iicdtor);
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if (error != 0)
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free(priv, M_IIC);
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return (error);
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}
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static void
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iicdtor(void *data)
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{
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device_t iicdev, parent;
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struct iic_cdevpriv *priv;
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priv = data;
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KASSERT(priv != NULL, ("iic cdevpriv should not be NULL!"));
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iicdev = priv->sc->sc_dev;
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parent = device_get_parent(iicdev);
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if (priv->started) {
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iicbus_stop(parent);
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iicbus_reset(parent, IIC_UNKNOWN, 0, NULL);
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iicbus_release_bus(parent, iicdev);
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}
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sx_destroy(&priv->lock);
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free(priv, M_IIC);
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}
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static int
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iicuio_move(struct iic_cdevpriv *priv, struct uio *uio, int last)
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{
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device_t parent;
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int error, num_bytes, transferred_bytes, written_bytes;
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char buffer[128];
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parent = device_get_parent(priv->sc->sc_dev);
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error = 0;
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/*
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* We can only transfer up to sizeof(buffer) bytes in 1 shot, so loop until
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* everything has been transferred.
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*/
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while ((error == 0) && (uio->uio_resid > 0)) {
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num_bytes = MIN(uio->uio_resid, sizeof(buffer));
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transferred_bytes = 0;
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if (uio->uio_rw == UIO_WRITE) {
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error = uiomove(buffer, num_bytes, uio);
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while ((error == 0) && (transferred_bytes < num_bytes)) {
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written_bytes = 0;
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error = iicbus_write(parent, &buffer[transferred_bytes],
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num_bytes - transferred_bytes, &written_bytes, 0);
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transferred_bytes += written_bytes;
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}
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} else if (uio->uio_rw == UIO_READ) {
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error = iicbus_read(parent, buffer,
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num_bytes, &transferred_bytes,
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((uio->uio_resid <= sizeof(buffer)) ? last : 0), 0);
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if (error == 0)
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error = uiomove(buffer, transferred_bytes, uio);
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}
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}
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return (error);
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}
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static int
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iicuio(struct cdev *dev, struct uio *uio, int ioflag)
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{
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device_t parent;
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struct iic_cdevpriv *priv;
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int error;
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uint8_t addr;
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priv = NULL;
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error = devfs_get_cdevpriv((void**)&priv);
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if (error != 0)
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return (error);
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KASSERT(priv != NULL, ("iic cdevpriv should not be NULL!"));
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IIC_LOCK(priv);
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if (priv->started || (priv->addr == 0)) {
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IIC_UNLOCK(priv);
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return (ENXIO);
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}
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parent = device_get_parent(priv->sc->sc_dev);
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error = iicbus_request_bus(parent, priv->sc->sc_dev,
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(ioflag & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
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if (error != 0) {
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IIC_UNLOCK(priv);
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return (error);
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}
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if (uio->uio_rw == UIO_READ)
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addr = priv->addr | LSB;
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else
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addr = priv->addr & ~LSB;
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error = iicbus_start(parent, addr, 0);
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if (error != 0)
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{
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iicbus_release_bus(parent, priv->sc->sc_dev);
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IIC_UNLOCK(priv);
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return (error);
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}
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error = iicuio_move(priv, uio, IIC_LAST_READ);
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iicbus_stop(parent);
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iicbus_release_bus(parent, priv->sc->sc_dev);
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IIC_UNLOCK(priv);
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return (error);
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}
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static int
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iicrdwr(struct iic_cdevpriv *priv, struct iic_rdwr_data *d, int flags)
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{
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struct iic_msg *buf, *m;
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void **usrbufs;
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device_t iicdev, parent;
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int error;
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uint32_t i;
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iicdev = priv->sc->sc_dev;
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parent = device_get_parent(iicdev);
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error = 0;
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if (d->nmsgs > IIC_RDRW_MAX_MSGS)
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return (EINVAL);
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buf = malloc(sizeof(*d->msgs) * d->nmsgs, M_IIC, M_WAITOK);
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error = copyin(d->msgs, buf, sizeof(*d->msgs) * d->nmsgs);
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if (error != 0) {
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free(buf, M_IIC);
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return (error);
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}
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/* Alloc kernel buffers for userland data, copyin write data */
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usrbufs = malloc(sizeof(void *) * d->nmsgs, M_IIC, M_WAITOK | M_ZERO);
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for (i = 0; i < d->nmsgs; i++) {
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m = &(buf[i]);
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usrbufs[i] = m->buf;
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/*
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* At least init the buffer to NULL so we can safely free() it later.
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* If the copyin() to buf failed, don't try to malloc bogus m->len.
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*/
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m->buf = NULL;
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if (error != 0)
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continue;
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/* m->len is uint16_t, so allocation size is capped at 64K. */
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m->buf = malloc(m->len, M_IIC, M_WAITOK);
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if (!(m->flags & IIC_M_RD))
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error = copyin(usrbufs[i], m->buf, m->len);
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}
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if (error == 0)
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error = iicbus_request_bus(parent, iicdev,
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(flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
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if (error == 0) {
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error = iicbus_transfer(iicdev, buf, d->nmsgs);
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iicbus_release_bus(parent, iicdev);
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}
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/* Copyout all read segments, free up kernel buffers */
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for (i = 0; i < d->nmsgs; i++) {
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m = &(buf[i]);
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if ((error == 0) && (m->flags & IIC_M_RD))
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error = copyout(m->buf, usrbufs[i], m->len);
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free(m->buf, M_IIC);
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}
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free(usrbufs, M_IIC);
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free(buf, M_IIC);
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return (error);
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}
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static int
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iicioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
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{
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device_t parent, iicdev;
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struct iiccmd *s;
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struct uio ubuf;
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struct iovec uvec;
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struct iic_cdevpriv *priv;
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int error;
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s = (struct iiccmd *)data;
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error = devfs_get_cdevpriv((void**)&priv);
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if (error != 0)
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return (error);
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KASSERT(priv != NULL, ("iic cdevpriv should not be NULL!"));
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iicdev = priv->sc->sc_dev;
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parent = device_get_parent(iicdev);
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IIC_LOCK(priv);
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switch (cmd) {
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case I2CSTART:
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if (priv->started) {
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error = EINVAL;
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break;
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}
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error = iicbus_request_bus(parent, iicdev,
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(flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
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if (error == 0)
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error = iicbus_start(parent, s->slave, 0);
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if (error == 0) {
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priv->addr = s->slave;
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priv->started = true;
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} else
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iicbus_release_bus(parent, iicdev);
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break;
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case I2CSTOP:
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if (priv->started) {
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error = iicbus_stop(parent);
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iicbus_release_bus(parent, iicdev);
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priv->started = false;
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}
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break;
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case I2CRSTCARD:
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/*
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* Bus should be owned before we reset it.
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* We allow the bus to be already owned as the result of an in-progress
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* sequence; however, bus reset will always be followed by release
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* (a new start is presumably needed for I/O anyway). */
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if (!priv->started)
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error = iicbus_request_bus(parent, iicdev,
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(flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
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if (error == 0) {
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error = iicbus_reset(parent, IIC_UNKNOWN, 0, NULL);
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/*
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* Ignore IIC_ENOADDR as it only means we have a master-only
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* controller.
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*/
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if (error == IIC_ENOADDR)
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error = 0;
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iicbus_release_bus(parent, iicdev);
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priv->started = false;
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}
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break;
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case I2CWRITE:
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if (!priv->started) {
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error = EINVAL;
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break;
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}
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uvec.iov_base = s->buf;
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uvec.iov_len = s->count;
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ubuf.uio_iov = &uvec;
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ubuf.uio_iovcnt = 1;
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ubuf.uio_segflg = UIO_USERSPACE;
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ubuf.uio_td = td;
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ubuf.uio_resid = s->count;
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ubuf.uio_offset = 0;
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ubuf.uio_rw = UIO_WRITE;
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error = iicuio_move(priv, &ubuf, 0);
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break;
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case I2CREAD:
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if (!priv->started) {
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error = EINVAL;
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break;
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}
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uvec.iov_base = s->buf;
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uvec.iov_len = s->count;
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ubuf.uio_iov = &uvec;
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ubuf.uio_iovcnt = 1;
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ubuf.uio_segflg = UIO_USERSPACE;
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ubuf.uio_td = td;
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ubuf.uio_resid = s->count;
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ubuf.uio_offset = 0;
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ubuf.uio_rw = UIO_READ;
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error = iicuio_move(priv, &ubuf, s->last);
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break;
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case I2CRDWR:
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/*
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* The rdwr list should be a self-contained set of
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* transactions. Fail if another transaction is in progress.
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*/
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if (priv->started) {
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error = EINVAL;
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break;
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}
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error = iicrdwr(priv, (struct iic_rdwr_data *)data, flags);
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break;
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case I2CRPTSTART:
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if (!priv->started) {
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error = EINVAL;
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break;
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}
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error = iicbus_repeated_start(parent, s->slave, 0);
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break;
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case I2CSADDR:
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priv->addr = *((uint8_t*)data);
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break;
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default:
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error = ENOTTY;
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}
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IIC_UNLOCK(priv);
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return (error);
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}
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DRIVER_MODULE(iic, iicbus, iic_driver, 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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