mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-05 09:14:03 +00:00
3d844eddb7
This reflects actual type used to store and compare child device orders. Change is mostly done via a Coccinelle (soon to be devel/coccinelle) semantic patch. Verified by LINT+modules kernel builds. Followup to: r212213 MFC after: 10 days
273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/*-
|
|
* Copyright (c) 1998, 2001 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* Autoconfiguration and support routines for the Philips serial I2C bus
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/bus.h>
|
|
|
|
#include <dev/iicbus/iiconf.h>
|
|
#include <dev/iicbus/iicbus.h>
|
|
|
|
#include "iicbus_if.h"
|
|
|
|
/* See comments below for why auto-scanning is a bad idea. */
|
|
#define SCAN_IICBUS 0
|
|
|
|
static int
|
|
iicbus_probe(device_t dev)
|
|
{
|
|
|
|
device_set_desc(dev, "Philips I2C bus");
|
|
|
|
/* Allow other subclasses to override this driver. */
|
|
return (BUS_PROBE_GENERIC);
|
|
}
|
|
|
|
#if SCAN_IICBUS
|
|
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)
|
|
{
|
|
#if SCAN_IICBUS
|
|
unsigned char addr;
|
|
#endif
|
|
struct iicbus_softc *sc = IICBUS_SOFTC(dev);
|
|
|
|
sc->dev = dev;
|
|
mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF);
|
|
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 SCAN_IICBUS
|
|
printf("Probing for devices on iicbus%d:", device_get_unit(dev));
|
|
|
|
/* probe any devices */
|
|
for (addr = 16; addr < 240; addr++) {
|
|
if (iic_probe_device(dev, (u_char)addr)) {
|
|
printf(" <%x>", addr);
|
|
}
|
|
}
|
|
printf("\n");
|
|
#endif
|
|
bus_generic_probe(dev);
|
|
bus_enumerate_hinted_children(dev);
|
|
bus_generic_attach(dev);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
iicbus_detach(device_t dev)
|
|
{
|
|
struct iicbus_softc *sc = IICBUS_SOFTC(dev);
|
|
|
|
iicbus_reset(dev, IIC_FASTEST, 0, NULL);
|
|
bus_generic_detach(dev);
|
|
mtx_destroy(&sc->lock);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
iicbus_print_child(device_t dev, device_t child)
|
|
{
|
|
struct iicbus_ivar *devi = IICBUS_IVAR(child);
|
|
int retval = 0;
|
|
|
|
retval += bus_print_child_header(dev, child);
|
|
if (devi->addr != 0)
|
|
retval += printf(" at addr %#x", devi->addr);
|
|
retval += bus_print_child_footer(dev, child);
|
|
|
|
return (retval);
|
|
}
|
|
|
|
static void
|
|
iicbus_probe_nomatch(device_t bus, device_t child)
|
|
{
|
|
struct iicbus_ivar *devi = IICBUS_IVAR(child);
|
|
|
|
device_printf(bus, "<unknown card>");
|
|
printf(" at addr %#x\n", devi->addr);
|
|
return;
|
|
}
|
|
|
|
static int
|
|
iicbus_child_location_str(device_t bus, device_t child, char *buf,
|
|
size_t buflen)
|
|
{
|
|
struct iicbus_ivar *devi = IICBUS_IVAR(child);
|
|
|
|
snprintf(buf, buflen, "addr=%#x", devi->addr);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
iicbus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
|
|
size_t buflen)
|
|
{
|
|
*buf = '\0';
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
iicbus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)
|
|
{
|
|
struct iicbus_ivar *devi = IICBUS_IVAR(child);
|
|
|
|
switch (which) {
|
|
default:
|
|
return (EINVAL);
|
|
case IICBUS_IVAR_ADDR:
|
|
*result = devi->addr;
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static device_t
|
|
iicbus_add_child(device_t dev, u_int order, const char *name, int unit)
|
|
{
|
|
device_t child;
|
|
struct iicbus_ivar *devi;
|
|
|
|
child = device_add_child_ordered(dev, order, name, unit);
|
|
if (child == NULL)
|
|
return (child);
|
|
devi = malloc(sizeof(struct iicbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
|
|
if (devi == NULL) {
|
|
device_delete_child(dev, child);
|
|
return (0);
|
|
}
|
|
device_set_ivars(child, devi);
|
|
return (child);
|
|
}
|
|
|
|
static void
|
|
iicbus_hinted_child(device_t bus, const char *dname, int dunit)
|
|
{
|
|
device_t child;
|
|
struct iicbus_ivar *devi;
|
|
|
|
child = BUS_ADD_CHILD(bus, 0, dname, dunit);
|
|
devi = IICBUS_IVAR(child);
|
|
resource_int_value(dname, dunit, "addr", &devi->addr);
|
|
}
|
|
|
|
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 device_method_t iicbus_methods[] = {
|
|
/* device interface */
|
|
DEVMETHOD(device_probe, iicbus_probe),
|
|
DEVMETHOD(device_attach, iicbus_attach),
|
|
DEVMETHOD(device_detach, iicbus_detach),
|
|
|
|
/* bus interface */
|
|
DEVMETHOD(bus_add_child, iicbus_add_child),
|
|
DEVMETHOD(bus_driver_added, bus_generic_driver_added),
|
|
DEVMETHOD(bus_print_child, iicbus_print_child),
|
|
DEVMETHOD(bus_probe_nomatch, iicbus_probe_nomatch),
|
|
DEVMETHOD(bus_read_ivar, iicbus_read_ivar),
|
|
DEVMETHOD(bus_child_pnpinfo_str, iicbus_child_pnpinfo_str),
|
|
DEVMETHOD(bus_child_location_str, iicbus_child_location_str),
|
|
DEVMETHOD(bus_hinted_child, iicbus_hinted_child),
|
|
|
|
/* iicbus interface */
|
|
DEVMETHOD(iicbus_transfer, iicbus_transfer),
|
|
|
|
{ 0, 0 }
|
|
};
|
|
|
|
driver_t iicbus_driver = {
|
|
"iicbus",
|
|
iicbus_methods,
|
|
sizeof(struct iicbus_softc),
|
|
};
|
|
|
|
devclass_t iicbus_devclass;
|
|
|
|
MODULE_VERSION(iicbus, IICBUS_MODVER);
|
|
DRIVER_MODULE(iicbus, iichb, iicbus_driver, iicbus_devclass, 0, 0);
|
|
|