514 lines
12 KiB
C
514 lines
12 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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/*
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* I2C to SMB bridge
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*
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* Example:
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*
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* smb bttv
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* \ /
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* smbus
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* / \
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* iicsmb bti2c
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* |
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* iicbus
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* / | \
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* iicbb pcf ...
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* |
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* lpbb
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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/uio.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/smbus/smbconf.h>
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#include "iicbus_if.h"
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#include "smbus_if.h"
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struct iicsmb_softc {
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#define SMB_WAITING_ADDR 0x0
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#define SMB_WAITING_LOW 0x1
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#define SMB_WAITING_HIGH 0x2
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#define SMB_DONE 0x3
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int state;
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u_char devaddr; /* slave device address */
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char low; /* low byte received first */
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char high; /* high byte */
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device_t smbus;
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};
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static int iicsmb_probe(device_t);
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static int iicsmb_attach(device_t);
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static int iicsmb_detach(device_t);
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static void iicsmb_identify(driver_t *driver, device_t parent);
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static void iicsmb_intr(device_t dev, int event, char *buf);
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static int iicsmb_callback(device_t dev, int index, caddr_t data);
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static int iicsmb_quick(device_t dev, u_char slave, int how);
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static int iicsmb_sendb(device_t dev, u_char slave, char byte);
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static int iicsmb_recvb(device_t dev, u_char slave, char *byte);
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static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte);
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static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word);
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static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte);
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static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word);
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static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata);
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static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf);
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static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf);
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static devclass_t iicsmb_devclass;
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static device_method_t iicsmb_methods[] = {
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/* device interface */
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DEVMETHOD(device_identify, iicsmb_identify),
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DEVMETHOD(device_probe, iicsmb_probe),
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DEVMETHOD(device_attach, iicsmb_attach),
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DEVMETHOD(device_detach, iicsmb_detach),
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/* bus interface */
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DEVMETHOD(bus_driver_added, bus_generic_driver_added),
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DEVMETHOD(bus_print_child, bus_generic_print_child),
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/* iicbus interface */
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DEVMETHOD(iicbus_intr, iicsmb_intr),
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/* smbus interface */
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DEVMETHOD(smbus_callback, iicsmb_callback),
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DEVMETHOD(smbus_quick, iicsmb_quick),
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DEVMETHOD(smbus_sendb, iicsmb_sendb),
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DEVMETHOD(smbus_recvb, iicsmb_recvb),
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DEVMETHOD(smbus_writeb, iicsmb_writeb),
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DEVMETHOD(smbus_writew, iicsmb_writew),
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DEVMETHOD(smbus_readb, iicsmb_readb),
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DEVMETHOD(smbus_readw, iicsmb_readw),
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DEVMETHOD(smbus_pcall, iicsmb_pcall),
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DEVMETHOD(smbus_bwrite, iicsmb_bwrite),
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DEVMETHOD(smbus_bread, iicsmb_bread),
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{ 0, 0 }
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};
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static driver_t iicsmb_driver = {
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"iicsmb",
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iicsmb_methods,
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sizeof(struct iicsmb_softc),
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};
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#define IICBUS_TIMEOUT 100 /* us */
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static void
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iicsmb_identify(driver_t *driver, device_t parent)
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{
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BUS_ADD_CHILD(parent, 0, "iicsmb", -1);
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}
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static int
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iicsmb_probe(device_t dev)
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{
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device_set_desc(dev, "SMBus over I2C bridge");
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return (0);
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}
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static int
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iicsmb_attach(device_t dev)
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{
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struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
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bzero(sc, sizeof(*sc));
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sc->smbus = device_add_child(dev, "smbus", -1);
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/* probe and attach the smbus */
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bus_generic_attach(dev);
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return (0);
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}
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static int
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iicsmb_detach(device_t dev)
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{
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struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
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bus_generic_detach(dev);
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if (sc->smbus) {
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device_delete_child(dev, sc->smbus);
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}
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return (0);
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}
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/*
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* iicsmb_intr()
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*
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* iicbus interrupt handler
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*/
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static void
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iicsmb_intr(device_t dev, int event, char *buf)
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{
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struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
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switch (event) {
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case INTR_GENERAL:
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case INTR_START:
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sc->state = SMB_WAITING_ADDR;
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break;
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case INTR_STOP:
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/* call smbus intr handler */
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smbus_intr(sc->smbus, sc->devaddr,
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sc->low, sc->high, SMB_ENOERR);
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break;
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case INTR_RECEIVE:
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switch (sc->state) {
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case SMB_DONE:
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/* XXX too much data, discard */
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printf("%s: too much data from 0x%x\n", __func__,
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sc->devaddr & 0xff);
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goto end;
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case SMB_WAITING_ADDR:
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sc->devaddr = (u_char)*buf;
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sc->state = SMB_WAITING_LOW;
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break;
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case SMB_WAITING_LOW:
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sc->low = *buf;
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sc->state = SMB_WAITING_HIGH;
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break;
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case SMB_WAITING_HIGH:
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sc->high = *buf;
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sc->state = SMB_DONE;
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break;
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}
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end:
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break;
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case INTR_TRANSMIT:
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case INTR_NOACK:
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break;
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case INTR_ERROR:
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switch (*buf) {
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case IIC_EBUSERR:
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smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR);
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break;
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default:
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printf("%s unknown error 0x%x!\n", __func__,
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(int)*buf);
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break;
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}
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break;
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default:
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panic("%s: unknown event (%d)!", __func__, event);
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}
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return;
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}
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static int
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iicsmb_callback(device_t dev, int index, caddr_t data)
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{
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device_t parent = device_get_parent(dev);
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int error = 0;
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int how;
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switch (index) {
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case SMB_REQUEST_BUS:
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/* request underlying iicbus */
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how = *(int *)data;
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error = iicbus_request_bus(parent, dev, how);
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break;
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case SMB_RELEASE_BUS:
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/* release underlying iicbus */
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error = iicbus_release_bus(parent, dev);
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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static int
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iicsmb_quick(device_t dev, u_char slave, int how)
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{
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device_t parent = device_get_parent(dev);
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int error;
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switch (how) {
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case SMB_QWRITE:
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error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT);
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break;
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case SMB_QREAD:
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error = iicbus_start(parent, slave | LSB, IICBUS_TIMEOUT);
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break;
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default:
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error = EINVAL;
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break;
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}
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if (!error)
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error = iicbus_stop(parent);
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return (error);
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}
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static int
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iicsmb_sendb(device_t dev, u_char slave, char byte)
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{
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device_t parent = device_get_parent(dev);
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int error, sent;
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error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT);
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if (!error) {
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error = iicbus_write(parent, &byte, 1, &sent, IICBUS_TIMEOUT);
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iicbus_stop(parent);
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}
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return (error);
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}
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static int
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iicsmb_recvb(device_t dev, u_char slave, char *byte)
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{
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device_t parent = device_get_parent(dev);
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int error, read;
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error = iicbus_start(parent, slave | LSB, 0);
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if (!error) {
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error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, IICBUS_TIMEOUT);
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iicbus_stop(parent);
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}
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return (error);
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}
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static int
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iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
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{
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device_t parent = device_get_parent(dev);
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int error, sent;
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error = iicbus_start(parent, slave & ~LSB, 0);
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if (!error) {
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if (!(error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
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error = iicbus_write(parent, &byte, 1, &sent, IICBUS_TIMEOUT);
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iicbus_stop(parent);
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}
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return (error);
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}
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static int
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iicsmb_writew(device_t dev, u_char slave, char cmd, short word)
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{
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device_t parent = device_get_parent(dev);
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int error, sent;
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char low = (char)(word & 0xff);
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char high = (char)((word & 0xff00) >> 8);
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error = iicbus_start(parent, slave & ~LSB, 0);
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if (!error) {
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if (!(error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
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if (!(error = iicbus_write(parent, &low, 1, &sent, IICBUS_TIMEOUT)))
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error = iicbus_write(parent, &high, 1, &sent, IICBUS_TIMEOUT);
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iicbus_stop(parent);
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}
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return (error);
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}
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static int
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iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
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{
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device_t parent = device_get_parent(dev);
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int error, sent, read;
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if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
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return (error);
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if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
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goto error;
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error:
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iicbus_stop(parent);
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return (error);
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}
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#define BUF2SHORT(low,high) \
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((short)(((high) & 0xff) << 8) | (short)((low) & 0xff))
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static int
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iicsmb_readw(device_t dev, u_char slave, char cmd, short *word)
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{
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device_t parent = device_get_parent(dev);
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int error, sent, read;
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char buf[2];
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if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
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return (error);
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if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
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goto error;
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/* first, receive low, then high byte */
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*word = BUF2SHORT(buf[0], buf[1]);
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error:
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iicbus_stop(parent);
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return (error);
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}
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static int
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iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)
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{
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device_t parent = device_get_parent(dev);
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int error, sent, read;
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char buf[2];
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if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
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return (error);
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if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
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goto error;
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/* first, send low, then high byte */
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buf[0] = (char)(sdata & 0xff);
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buf[1] = (char)((sdata & 0xff00) >> 8);
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if ((error = iicbus_write(parent, buf, 2, &sent, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
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goto error;
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/* first, receive low, then high byte */
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*rdata = BUF2SHORT(buf[0], buf[1]);
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error:
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iicbus_stop(parent);
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return (error);
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}
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static int
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iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
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{
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device_t parent = device_get_parent(dev);
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int error, sent;
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if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_write(parent, buf, (int)count, &sent, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_stop(parent)))
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goto error;
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error:
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return (error);
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}
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static int
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iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf)
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{
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device_t parent = device_get_parent(dev);
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int error, sent, read;
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if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
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return (error);
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if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
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goto error;
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if ((error = iicbus_read(parent, buf, (int)count, &read,
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IIC_LAST_READ, IICBUS_TIMEOUT)))
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goto error;
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error:
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iicbus_stop(parent);
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return (error);
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}
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DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0);
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MODULE_DEPEND(iicsmb, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
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MODULE_DEPEND(iicsmb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
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MODULE_VERSION(iicsmb, 1);
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