freebsd-dev/sys/dev/pwm/pwmbus.c
Emmanuel Vadot e213223c9b Remove "all rights reserved" from copyright for the file I own.
Some of the files have both me and Jared McNeill and he gave me
permission to remove it from his files too.
2019-12-03 21:00:45 +00:00

293 lines
7.2 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org>
*
* 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("$FreeBSD$");
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <dev/pwm/pwmbus.h>
#include "pwmbus_if.h"
/*
* bus_if methods...
*/
static device_t
pwmbus_add_child(device_t dev, u_int order, const char *name, int unit)
{
device_t child;
struct pwmbus_ivars *ivars;
child = device_add_child_ordered(dev, order, name, unit);
if (child == NULL)
return (child);
ivars = malloc(sizeof(struct pwmbus_ivars), M_DEVBUF, M_NOWAIT | M_ZERO);
if (ivars == NULL) {
device_delete_child(dev, child);
return (NULL);
}
device_set_ivars(child, ivars);
return (child);
}
static int
pwmbus_child_location_str(device_t dev, device_t child, char *buf, size_t blen)
{
struct pwmbus_ivars *ivars;
ivars = device_get_ivars(child);
snprintf(buf, blen, "hwdev=%s channel=%u",
device_get_nameunit(device_get_parent(dev)), ivars->pi_channel);
return (0);
}
static int
pwmbus_child_pnpinfo_str(device_t dev, device_t child, char *buf,
size_t buflen)
{
*buf = '\0';
return (0);
}
static void
pwmbus_hinted_child(device_t dev, const char *dname, int dunit)
{
struct pwmbus_ivars *ivars;
device_t child;
child = pwmbus_add_child(dev, 0, dname, dunit);
/*
* If there is a channel hint, use it. Otherwise pi_channel was
* initialized to zero, so that's the channel we'll use.
*/
ivars = device_get_ivars(child);
resource_int_value(dname, dunit, "channel", &ivars->pi_channel);
}
static int
pwmbus_print_child(device_t dev, device_t child)
{
struct pwmbus_ivars *ivars;
int rv;
ivars = device_get_ivars(child);
rv = bus_print_child_header(dev, child);
rv += printf(" channel %u", ivars->pi_channel);
rv += bus_print_child_footer(dev, child);
return (rv);
}
static void
pwmbus_probe_nomatch(device_t dev, device_t child)
{
struct pwmbus_ivars *ivars;
ivars = device_get_ivars(child);
if (ivars != NULL)
device_printf(dev, "<unknown> on channel %u\n",
ivars->pi_channel);
return;
}
static int
pwmbus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct pwmbus_ivars *ivars;
ivars = device_get_ivars(child);
switch (which) {
case PWMBUS_IVAR_CHANNEL:
*(u_int *)result = ivars->pi_channel;
break;
default:
return (EINVAL);
}
return (0);
}
/*
* device_if methods...
*/
static int
pwmbus_probe(device_t dev)
{
device_set_desc(dev, "PWM bus");
return (BUS_PROBE_GENERIC);
}
static int
pwmbus_attach(device_t dev)
{
struct pwmbus_softc *sc;
struct pwmbus_ivars *ivars;
device_t child, parent;
u_int chan;
sc = device_get_softc(dev);
sc->dev = dev;
parent = device_get_parent(dev);
if (PWMBUS_CHANNEL_COUNT(parent, &sc->nchannels) != 0 ||
sc->nchannels == 0) {
device_printf(sc->dev, "No channels on parent %s\n",
device_get_nameunit(parent));
return (ENXIO);
}
/* Add a pwmc(4) child for each channel. */
for (chan = 0; chan < sc->nchannels; ++chan) {
if ((child = pwmbus_add_child(sc->dev, 0, "pwmc", -1)) == NULL) {
device_printf(dev, "failed to add pwmc child device "
"for channel %u\n", chan);
continue;
}
ivars = device_get_ivars(child);
ivars->pi_channel = chan;
}
bus_enumerate_hinted_children(dev);
bus_generic_probe(dev);
return (bus_generic_attach(dev));
}
static int
pwmbus_detach(device_t dev)
{
int rv;
if ((rv = bus_generic_detach(dev)) == 0)
rv = device_delete_children(dev);
return (rv);
}
/*
* pwmbus_if methods...
*/
static int
pwmbus_channel_config(device_t dev, u_int chan, u_int period, u_int duty)
{
return (PWMBUS_CHANNEL_CONFIG(device_get_parent(dev), chan, period, duty));
}
static int
pwmbus_channel_get_config(device_t dev, u_int chan, u_int *period, u_int *duty)
{
return (PWMBUS_CHANNEL_GET_CONFIG(device_get_parent(dev), chan, period, duty));
}
static int
pwmbus_channel_get_flags(device_t dev, u_int chan, uint32_t *flags)
{
return (PWMBUS_CHANNEL_GET_FLAGS(device_get_parent(dev), chan, flags));
}
static int
pwmbus_channel_enable(device_t dev, u_int chan, bool enable)
{
return (PWMBUS_CHANNEL_ENABLE(device_get_parent(dev), chan, enable));
}
static int
pwmbus_channel_set_flags(device_t dev, u_int chan, uint32_t flags)
{
return (PWMBUS_CHANNEL_SET_FLAGS(device_get_parent(dev), chan, flags));
}
static int
pwmbus_channel_is_enabled(device_t dev, u_int chan, bool *enable)
{
return (PWMBUS_CHANNEL_IS_ENABLED(device_get_parent(dev), chan, enable));
}
static int
pwmbus_channel_count(device_t dev, u_int *nchannel)
{
return (PWMBUS_CHANNEL_COUNT(device_get_parent(dev), nchannel));
}
static device_method_t pwmbus_methods[] = {
/* device_if */
DEVMETHOD(device_probe, pwmbus_probe),
DEVMETHOD(device_attach, pwmbus_attach),
DEVMETHOD(device_detach, pwmbus_detach),
/* bus_if */
DEVMETHOD(bus_add_child, pwmbus_add_child),
DEVMETHOD(bus_child_location_str, pwmbus_child_location_str),
DEVMETHOD(bus_child_pnpinfo_str, pwmbus_child_pnpinfo_str),
DEVMETHOD(bus_hinted_child, pwmbus_hinted_child),
DEVMETHOD(bus_print_child, pwmbus_print_child),
DEVMETHOD(bus_probe_nomatch, pwmbus_probe_nomatch),
DEVMETHOD(bus_read_ivar, pwmbus_read_ivar),
/* pwmbus_if */
DEVMETHOD(pwmbus_channel_count, pwmbus_channel_count),
DEVMETHOD(pwmbus_channel_config, pwmbus_channel_config),
DEVMETHOD(pwmbus_channel_get_config, pwmbus_channel_get_config),
DEVMETHOD(pwmbus_channel_set_flags, pwmbus_channel_set_flags),
DEVMETHOD(pwmbus_channel_get_flags, pwmbus_channel_get_flags),
DEVMETHOD(pwmbus_channel_enable, pwmbus_channel_enable),
DEVMETHOD(pwmbus_channel_is_enabled, pwmbus_channel_is_enabled),
DEVMETHOD_END
};
driver_t pwmbus_driver = {
"pwmbus",
pwmbus_methods,
sizeof(struct pwmbus_softc),
};
devclass_t pwmbus_devclass;
EARLY_DRIVER_MODULE(pwmbus, pwm, pwmbus_driver, pwmbus_devclass, 0, 0,
BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(pwmbus, 1);