/*- * Copyright (c) 1998, 2001 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 #include #include #include #include #include #include #include #include #include #include #include "smbus_if.h" #define BUFSIZE 1024 struct smb_softc { int sc_count; /* >0 if device opened */ struct cdev *sc_devnode; }; #define IIC_SOFTC(unit) \ ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit))) #define IIC_DEVICE(unit) \ (devclass_get_device(smb_devclass, (unit))) static void smb_identify(driver_t *driver, device_t parent); static int smb_probe(device_t); static int smb_attach(device_t); static int smb_detach(device_t); static devclass_t smb_devclass; static device_method_t smb_methods[] = { /* device interface */ DEVMETHOD(device_identify, smb_identify), DEVMETHOD(device_probe, smb_probe), DEVMETHOD(device_attach, smb_attach), DEVMETHOD(device_detach, smb_detach), /* smbus interface */ DEVMETHOD(smbus_intr, smbus_generic_intr), { 0, 0 } }; static driver_t smb_driver = { "smb", smb_methods, sizeof(struct smb_softc), }; static d_open_t smbopen; static d_close_t smbclose; static d_ioctl_t smbioctl; static struct cdevsw smb_cdevsw = { .d_version = D_VERSION, .d_flags = D_NEEDGIANT, .d_open = smbopen, .d_close = smbclose, .d_ioctl = smbioctl, .d_name = "smb", }; static void smb_identify(driver_t *driver, device_t parent) { if (device_find_child(parent, "smb", -1) == NULL) BUS_ADD_CHILD(parent, 0, "smb", -1); } static int smb_probe(device_t dev) { device_set_desc(dev, "SMBus generic I/O"); return (0); } static int smb_attach(device_t dev) { struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); if (!sc) return (ENOMEM); bzero(sc, sizeof(struct smb_softc *)); sc->sc_devnode = make_dev(&smb_cdevsw, device_get_unit(dev), UID_ROOT, GID_WHEEL, 0600, "smb%d", device_get_unit(dev)); return (0); } static int smb_detach(device_t dev) { struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); if (sc->sc_devnode) destroy_dev(sc->sc_devnode); return (0); } static int smbopen (struct cdev *dev, int flags, int fmt, struct thread *td) { struct smb_softc *sc = IIC_SOFTC(minor(dev)); if (sc == NULL) return (ENXIO); if (sc->sc_count != 0) return (EBUSY); sc->sc_count++; return (0); } static int smbclose(struct cdev *dev, int flags, int fmt, struct thread *td) { struct smb_softc *sc = IIC_SOFTC(minor(dev)); if (sc == NULL) return (ENXIO); if (sc->sc_count == 0) /* This is not supposed to happen. */ return (0); sc->sc_count--; return (0); } static int smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) { char buf[SMB_MAXBLOCKSIZE]; device_t parent; struct smbcmd *s = (struct smbcmd *)data; struct smb_softc *sc = IIC_SOFTC(minor(dev)); device_t smbdev = IIC_DEVICE(minor(dev)); int error; short w; u_char count; char c; if (sc == NULL) return (ENXIO); if (s == NULL) return (EINVAL); parent = device_get_parent(smbdev); /* Allocate the bus. */ if ((error = smbus_request_bus(parent, smbdev, (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) return (error); switch (cmd) { case SMB_QUICK_WRITE: error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); break; case SMB_QUICK_READ: error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); break; case SMB_SENDB: error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); break; case SMB_RECVB: error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); break; case SMB_WRITEB: error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, s->data.byte)); break; case SMB_WRITEW: error = smbus_error(smbus_writew(parent, s->slave, s->cmd, s->data.word)); break; case SMB_READB: if (s->data.byte_ptr) { error = smbus_error(smbus_readb(parent, s->slave, s->cmd, &c)); if (error) break; error = copyout(&c, s->data.byte_ptr, sizeof(*(s->data.byte_ptr))); } break; case SMB_READW: if (s->data.word_ptr) { error = smbus_error(smbus_readw(parent, s->slave, s->cmd, &w)); if (error == 0) { error = copyout(&w, s->data.word_ptr, sizeof(*(s->data.word_ptr))); } } break; case SMB_PCALL: if (s->data.process.rdata) { error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, s->data.process.sdata, &w)); if (error) break; error = copyout(&w, s->data.process.rdata, sizeof(*(s->data.process.rdata))); } break; case SMB_BWRITE: if (s->count && s->data.byte_ptr) { if (s->count > SMB_MAXBLOCKSIZE) s->count = SMB_MAXBLOCKSIZE; error = copyin(s->data.byte_ptr, buf, s->count); if (error) break; error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd, s->count, buf)); } break; case SMB_OLD_BREAD: case SMB_BREAD: if (s->count && s->data.byte_ptr) { count = min(s->count, SMB_MAXBLOCKSIZE); error = smbus_error(smbus_bread(parent, s->slave, s->cmd, &count, buf)); if (error) break; error = copyout(buf, s->data.byte_ptr, min(count, s->count)); s->count = count; } break; default: error = ENOTTY; } smbus_release_bus(parent, smbdev); return (error); } DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0); MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER); MODULE_VERSION(smb, 1);