/*- * 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/iicsmb.c,v 1.5.2.2 2000/08/09 00:59:27 peter Exp $ * $DragonFly: src/sys/bus/iicbus/iicsmb.c,v 1.2 2003/06/17 04:28:27 dillon Exp $ * */ /* * I2C to SMB bridge * * Example: * * smb bttv * \ / * smbus * / \ * iicsmb bti2c * | * iicbus * / | \ * iicbb pcf ... * | * lpbb */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "iicbus_if.h" #include "smbus_if.h" struct iicsmb_softc { #define SMB_WAITING_ADDR 0x0 #define SMB_WAITING_LOW 0x1 #define SMB_WAITING_HIGH 0x2 #define SMB_DONE 0x3 int state; u_char devaddr; /* slave device address */ char low; /* low byte received first */ char high; /* high byte */ device_t smbus; }; static int iicsmb_probe(device_t); static int iicsmb_attach(device_t); static void iicsmb_intr(device_t dev, int event, char *buf); static int iicsmb_callback(device_t dev, int index, caddr_t data); static int iicsmb_quick(device_t dev, u_char slave, int how); static int iicsmb_sendb(device_t dev, u_char slave, char byte); static int iicsmb_recvb(device_t dev, u_char slave, char *byte); static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte); static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word); static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte); static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word); static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata); static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf); static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf); static devclass_t iicsmb_devclass; static device_method_t iicsmb_methods[] = { /* device interface */ DEVMETHOD(device_probe, iicsmb_probe), DEVMETHOD(device_attach, iicsmb_attach), DEVMETHOD(device_detach, bus_generic_detach), /* bus interface */ DEVMETHOD(bus_print_child, bus_generic_print_child), /* iicbus interface */ DEVMETHOD(iicbus_intr, iicsmb_intr), /* smbus interface */ DEVMETHOD(smbus_callback, iicsmb_callback), DEVMETHOD(smbus_quick, iicsmb_quick), DEVMETHOD(smbus_sendb, iicsmb_sendb), DEVMETHOD(smbus_recvb, iicsmb_recvb), DEVMETHOD(smbus_writeb, iicsmb_writeb), DEVMETHOD(smbus_writew, iicsmb_writew), DEVMETHOD(smbus_readb, iicsmb_readb), DEVMETHOD(smbus_readw, iicsmb_readw), DEVMETHOD(smbus_pcall, iicsmb_pcall), DEVMETHOD(smbus_bwrite, iicsmb_bwrite), DEVMETHOD(smbus_bread, iicsmb_bread), { 0, 0 } }; static driver_t iicsmb_driver = { "iicsmb", iicsmb_methods, sizeof(struct iicsmb_softc), }; static int iicsmb_probe(device_t dev) { struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); sc->smbus = smbus_alloc_bus(dev); if (!sc->smbus) return (EINVAL); /* XXX don't know what to return else */ return (0); } static int iicsmb_attach(device_t dev) { struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); /* probe and attach the smbus */ device_probe_and_attach(sc->smbus); return (0); } /* * iicsmb_intr() * * iicbus interrupt handler */ static void iicsmb_intr(device_t dev, int event, char *buf) { struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); switch (event) { case INTR_GENERAL: case INTR_START: sc->state = SMB_WAITING_ADDR; break; case INTR_STOP: /* call smbus intr handler */ smbus_intr(sc->smbus, sc->devaddr, sc->low, sc->high, SMB_ENOERR); break; case INTR_RECEIVE: switch (sc->state) { case SMB_DONE: /* XXX too much data, discard */ printf("%s: too much data from 0x%x\n", __FUNCTION__, sc->devaddr & 0xff); goto end; case SMB_WAITING_ADDR: sc->devaddr = (u_char)*buf; sc->state = SMB_WAITING_LOW; break; case SMB_WAITING_LOW: sc->low = *buf; sc->state = SMB_WAITING_HIGH; break; case SMB_WAITING_HIGH: sc->high = *buf; sc->state = SMB_DONE; break; } end: break; case INTR_TRANSMIT: case INTR_NOACK: break; case INTR_ERROR: switch (*buf) { case IIC_EBUSERR: smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR); break; default: printf("%s unknown error 0x%x!\n", __FUNCTION__, (int)*buf); break; } break; default: panic("%s: unknown event (%d)!", __FUNCTION__, event); } return; } static int iicsmb_callback(device_t dev, int index, caddr_t data) { device_t parent = device_get_parent(dev); int error = 0; int how; switch (index) { case SMB_REQUEST_BUS: /* request underlying iicbus */ how = *(int *)data; error = iicbus_request_bus(parent, dev, how); break; case SMB_RELEASE_BUS: /* release underlying iicbus */ error = iicbus_release_bus(parent, dev); break; default: error = EINVAL; } return (error); } static int iicsmb_quick(device_t dev, u_char slave, int how) { device_t parent = device_get_parent(dev); int error; switch (how) { case SMB_QWRITE: error = iicbus_start(parent, slave & ~LSB, 0); break; case SMB_QREAD: error = iicbus_start(parent, slave | LSB, 0); break; default: error = EINVAL; break; } if (!error) error = iicbus_stop(parent); return (error); } static int iicsmb_sendb(device_t dev, u_char slave, char byte) { device_t parent = device_get_parent(dev); int error, sent; error = iicbus_start(parent, slave & ~LSB, 0); if (!error) { error = iicbus_write(parent, &byte, 1, &sent, 0); iicbus_stop(parent); } return (error); } static int iicsmb_recvb(device_t dev, u_char slave, char *byte) { device_t parent = device_get_parent(dev); int error, read; error = iicbus_start(parent, slave | LSB, 0); if (!error) { error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0); iicbus_stop(parent); } return (error); } static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte) { device_t parent = device_get_parent(dev); int error, sent; error = iicbus_start(parent, slave & ~LSB, 0); if (!error) { if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) error = iicbus_write(parent, &byte, 1, &sent, 0); iicbus_stop(parent); } return (error); } static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word) { device_t parent = device_get_parent(dev); int error, sent; char low = (char)(word & 0xff); char high = (char)((word & 0xff00) >> 8); error = iicbus_start(parent, slave & ~LSB, 0); if (!error) { if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) if (!(error = iicbus_write(parent, &low, 1, &sent, 0))) error = iicbus_write(parent, &high, 1, &sent, 0); iicbus_stop(parent); } return (error); } static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte) { device_t parent = device_get_parent(dev); int error, sent, read; if ((error = iicbus_start(parent, slave & ~LSB, 0))) return (error); if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) goto error; if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) goto error; if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0))) goto error; error: iicbus_stop(parent); return (error); } #define BUF2SHORT(low,high) \ ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff)) static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word) { device_t parent = device_get_parent(dev); int error, sent, read; char buf[2]; if ((error = iicbus_start(parent, slave & ~LSB, 0))) return (error); if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) goto error; if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) goto error; if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) goto error; /* first, receive low, then high byte */ *word = BUF2SHORT(buf[0], buf[1]); error: iicbus_stop(parent); return (error); } static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata) { device_t parent = device_get_parent(dev); int error, sent, read; char buf[2]; if ((error = iicbus_start(parent, slave & ~LSB, 0))) return (error); if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) goto error; /* first, send low, then high byte */ buf[0] = (char)(sdata & 0xff); buf[1] = (char)((sdata & 0xff00) >> 8); if ((error = iicbus_write(parent, buf, 2, &sent, 0))) goto error; if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) goto error; if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) goto error; /* first, receive low, then high byte */ *rdata = BUF2SHORT(buf[0], buf[1]); error: iicbus_stop(parent); return (error); } static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf) { device_t parent = device_get_parent(dev); int error, sent; if ((error = iicbus_start(parent, slave & ~LSB, 0))) goto error; if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) goto error; if ((error = iicbus_write(parent, buf, (int)count, &sent, 0))) goto error; if ((error = iicbus_stop(parent))) goto error; error: return (error); } static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf) { device_t parent = device_get_parent(dev); int error, sent, read; if ((error = iicbus_start(parent, slave & ~LSB, 0))) return (error); if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) goto error; if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) goto error; if ((error = iicbus_read(parent, buf, (int)count, &read, IIC_LAST_READ, 0))) goto error; error: iicbus_stop(parent); return (error); } DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0);