290 lines
7.0 KiB
C
290 lines
7.0 KiB
C
/*-
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* Copyright (c) 1998 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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* Autoconfiguration and support routines for the Philips serial I2C bus
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <machine/clock.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include "iicbus_if.h"
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#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev))
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/*
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* structure used to attach devices to the I2C bus
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*/
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struct iicbus_device {
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const char *iicd_name; /* device name */
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int iicd_class; /* driver or slave device class */
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const char *iicd_desc; /* device descriptor */
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u_char iicd_addr; /* address of the device */
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int iicd_waitack; /* wait for ack timeout or delay */
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int iicd_alive; /* 1 if device found */
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};
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/*
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* Common I2C addresses
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*/
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#define I2C_GENERAL_CALL 0x0
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#define PCF_MASTER_ADDRESS 0xaa
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#define FIRST_SLAVE_ADDR 0x2
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#define LAST_SLAVE_ADDR 255
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#define IICBUS_UNKNOWN_CLASS 0
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#define IICBUS_DEVICE_CLASS 1
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#define IICBUS_DRIVER_CLASS 2
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/*
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* list of known devices
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*
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* XXX only one smb driver should exist for each I2C interface
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*/
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static struct iicbus_device iicbus_children[] = {
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{ "iicsmb", IICBUS_DRIVER_CLASS, "I2C to SMB bridge" },
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{ "iic", IICBUS_DRIVER_CLASS, "I2C general purpose I/O" },
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#if 0
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{ "ic", IICBUS_DEVICE_CLASS, "network interface", PCF_MASTER_ADDRESS },
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#endif
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{ NULL, 0 }
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};
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static devclass_t iicbus_devclass;
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/*
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* Device methods
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*/
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static int iicbus_probe(device_t);
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static int iicbus_attach(device_t);
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static int iicbus_print_child(device_t, device_t);
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static int iicbus_read_ivar(device_t , device_t, int, u_long *);
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static int iicbus_write_ivar(device_t , device_t, int, u_long);
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static device_method_t iicbus_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, iicbus_probe),
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DEVMETHOD(device_attach, iicbus_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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/* bus interface */
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DEVMETHOD(bus_print_child, iicbus_print_child),
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DEVMETHOD(bus_read_ivar, iicbus_read_ivar),
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DEVMETHOD(bus_write_ivar, iicbus_write_ivar),
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{ 0, 0 }
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};
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static driver_t iicbus_driver = {
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"iicbus",
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iicbus_methods,
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sizeof(struct iicbus_softc),
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};
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static int
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iicbus_probe(device_t dev)
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{
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device_set_desc(dev, "Philips I2C bus");
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return (0);
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}
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#if 0
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static int
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iic_probe_device(device_t dev, u_char addr)
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{
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int count;
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char byte;
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if ((addr & 1) == 0) {
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/* is device writable? */
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if (!iicbus_start(dev, (u_char)addr, 0)) {
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iicbus_stop(dev);
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return (1);
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}
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} else {
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/* is device readable? */
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if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count))
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return (1);
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}
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return (0);
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}
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#endif
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/*
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* We add all the devices which we know about.
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* The generic attach routine will attach them if they are alive.
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*/
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static int
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iicbus_attach(device_t dev)
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{
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struct iicbus_device *iicdev;
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device_t child;
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iicbus_reset(dev, IIC_FASTEST, 0, NULL);
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/* device probing is meaningless since the bus is supposed to be
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* hot-plug. Moreover, some I2C chips do not appreciate random
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* accesses like stop after start to fast, reads for less than
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* x bytes...
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*/
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#if 0
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printf("Probing for devices on iicbus%d:", device_get_unit(dev));
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/* probe any devices */
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for (addr = FIRST_SLAVE_ADDR; addr <= LAST_SLAVE_ADDR; addr++) {
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if (iic_probe_device(dev, (u_char)addr)) {
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printf(" <%x>", addr);
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}
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}
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printf("\n");
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#endif
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/* attach known devices */
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for (iicdev = iicbus_children; iicdev->iicd_name; iicdev++) {
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switch (iicdev->iicd_class) {
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case IICBUS_DEVICE_CLASS:
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/* check if the devclass exists */
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if (devclass_find(iicdev->iicd_name))
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iicdev->iicd_alive = 1;
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else if (bootverbose)
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printf("iicbus: %s devclass not found\n",
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iicdev->iicd_name);
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break;
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case IICBUS_DRIVER_CLASS:
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/* check if the devclass exists */
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if (devclass_find(iicdev->iicd_name))
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iicdev->iicd_alive = 1;
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else if (bootverbose)
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printf("iicbus: %s devclass not found\n",
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iicdev->iicd_name);
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break;
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default:
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panic("%s: unknown class!", __FUNCTION__);
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}
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if (iicdev->iicd_alive) {
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child = device_add_child(dev, iicdev->iicd_name,
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-1, iicdev);
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device_set_desc(child, iicdev->iicd_desc);
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}
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}
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bus_generic_attach(dev);
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return (0);
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}
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int
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iicbus_generic_intr(device_t dev, int event, char *buf)
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{
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return (0);
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}
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int
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iicbus_null_callback(device_t dev, int index, caddr_t data)
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{
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return (0);
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}
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int
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iicbus_null_repeated_start(device_t dev, u_char addr)
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{
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return (IIC_ENOTSUPP);
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}
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static int
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iicbus_print_child(device_t bus, device_t dev)
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{
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struct iicbus_device* iicdev = DEVTOIICBUS(dev);
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int retval = 0;
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retval += bus_print_child_header(bus, dev);
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switch (iicdev->iicd_class) {
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case IICBUS_DEVICE_CLASS:
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retval += printf(" on %s addr 0x%x\n",
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device_get_nameunit(bus), iicdev->iicd_addr);
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break;
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case IICBUS_DRIVER_CLASS:
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retval += bus_print_child_footer(bus, dev);
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break;
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default:
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panic("%s: unknown class!\n", __FUNCTION__);
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}
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return (retval);
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}
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static int
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iicbus_read_ivar(device_t bus, device_t dev, int index, u_long* result)
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{
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struct iicbus_device* iicdev = DEVTOIICBUS(dev);
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switch (index) {
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case IICBUS_IVAR_ADDR:
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*result = (u_long)iicdev->iicd_addr;
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break;
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default:
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return (ENOENT);
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}
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return (0);
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}
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static int
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iicbus_write_ivar(device_t bus, device_t dev, int index, u_long val)
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{
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switch (index) {
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default:
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return (ENOENT);
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}
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return (0);
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}
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DRIVER_MODULE(iicbus, pcf, iicbus_driver, iicbus_devclass, 0, 0);
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DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0);
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DRIVER_MODULE(iicbus, bti2c, iicbus_driver, iicbus_devclass, 0, 0);
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