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