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