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/*-
* 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.
*
* $Id: iiconf.c,v 1.1.1.11 1998/08/29 17:02:05 son Exp $
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include "iicbus_if.h"
/*
* iicbus_intr()
*/
void
iicbus_intr(device_t bus, int event, char *buf)
{
struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
/* call owner's intr routine */
if (sc->owner)
IICBUS_INTR(sc->owner, event, buf);
return;
}
/*
* iicbus_alloc_bus()
*
* Allocate a new bus connected to the given parent device
*/
device_t
iicbus_alloc_bus(device_t parent)
{
device_t child;
/* add the bus to the parent */
child = device_add_child(parent, "iicbus", -1, NULL);
if (child)
device_set_desc(child, "Philips I2C bus");
return (child);
}
/*
* iicbus_request_bus()
*
* Allocate the device to perform transfers.
*
* how : IIC_WAIT or IIC_DONTWAIT
*/
int
iicbus_request_bus(device_t bus, device_t dev, int how)
{
struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
int s, error = 0;
while (!error) {
s = splhigh();
if (sc->owner) {
splx(s);
switch (how) {
case (IIC_WAIT | IIC_INTR):
error = tsleep(sc, IICPRI|PCATCH, "iicreq", 0);
break;
case (IIC_WAIT | IIC_NOINTR):
error = tsleep(sc, IICPRI, "iicreq", 0);
break;
default:
return (EWOULDBLOCK);
break;
}
} else {
sc->owner = dev;
splx(s);
return (0);
}
}
return (error);
}
/*
* iicbus_release_bus()
*
* Release the device allocated with iicbus_request_dev()
*/
int
iicbus_release_bus(device_t bus, device_t dev)
{
struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
int s;
s = splhigh();
if (sc->owner != dev) {
splx(s);
return (EACCES);
}
sc->owner = 0;
splx(s);
/* wakeup waiting processes */
wakeup(sc);
return (0);
}
/*
* iicbus_block_write()
*
* Write a block of data to slave ; start/stop protocol managed
*/
int
iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)
{
u_char addr = slave & ~LSB;
int error;
if ((error = iicbus_start(bus, addr)))
return (error);
error = iicbus_write(bus, buf, len, sent);
iicbus_stop(bus);
return (error);
}
/*
* iicbus_block_read()
*
* Read a block of data from slave ; start/stop protocol managed
*/
int
iicbus_block_read(device_t bus, u_char slave, char *buf, int len, int *read)
{
u_char addr = slave | LSB;
int error;
if ((error = iicbus_start(bus, addr)))
return (error);
error = iicbus_read(bus, buf, len, read);
/* STOP condition sent at adapter level */
return (error);
}
/*
* iicbus_get_addr()
*
* Get the I2C 7 bits address of the device
*/
u_char
iicbus_get_addr(device_t dev)
{
u_long addr;
device_t parent = device_get_parent(dev);
BUS_READ_IVAR(parent, dev, IICBUS_IVAR_ADDR, &addr);
return ((u_char)addr);
}
u_char
iicbus_get_own_address(device_t bus)
{
struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
return (sc->ownaddr);
}
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