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ddfc9c4c59
Now that the upper layers all go through a layer to tie into these
information functions that translates an sbuf into char * and len. The
current interface suffers issues of what to do in cases of truncation,
etc. Instead, migrate all these functions to using struct sbuf and these
issues go away. The caller is also in charge of any memory allocation
and/or expansion that's needed during this process.
Create a bus_generic_child_{pnpinfo,location} and make it default. It
just returns success. This is for those busses that have no information
for these items. Migrate the now-empty routines to using this as
appropriate.
Document these new interfaces with man pages, and oversight from before.
Reviewed by: jhb, bcr
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D29937
224 lines
6.2 KiB
C
224 lines
6.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Ian Lepore <ian@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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/libkern.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/pwm/pwmbus.h>
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#include "pwmbus_if.h"
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struct ofw_pwmbus_ivars {
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struct pwmbus_ivars base;
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struct ofw_bus_devinfo devinfo;
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};
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struct ofw_pwmbus_softc {
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struct pwmbus_softc base;
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};
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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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ofw_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 ofw_pwmbus_ivars *ivars;
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if ((ivars = malloc(sizeof(struct ofw_pwmbus_ivars), M_DEVBUF,
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M_NOWAIT | M_ZERO)) == NULL) {
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return (NULL);
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}
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if ((child = device_add_child_ordered(dev, order, name, unit)) == NULL) {
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free(ivars, M_DEVBUF);
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return (NULL);
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}
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ivars->devinfo.obd_node = -1;
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device_set_ivars(child, ivars);
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return (child);
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}
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static void
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ofw_pwmbus_child_deleted(device_t dev, device_t child)
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{
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struct ofw_pwmbus_ivars *ivars;
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ivars = device_get_ivars(child);
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if (ivars != NULL) {
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ofw_bus_gen_destroy_devinfo(&ivars->devinfo);
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free(ivars, M_DEVBUF);
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}
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}
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static const struct ofw_bus_devinfo *
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ofw_pwmbus_get_devinfo(device_t bus, device_t dev)
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{
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struct ofw_pwmbus_ivars *ivars;
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ivars = device_get_ivars(dev);
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return (&ivars->devinfo);
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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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ofw_pwmbus_probe(device_t dev)
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{
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if (ofw_bus_get_node(dev) == -1) {
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return (ENXIO);
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}
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device_set_desc(dev, "OFW PWM bus");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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ofw_pwmbus_attach(device_t dev)
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{
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struct ofw_pwmbus_softc *sc;
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struct ofw_pwmbus_ivars *ivars;
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phandle_t node;
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device_t child, parent;
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pcell_t chan;
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bool any_children;
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sc = device_get_softc(dev);
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sc->base.dev = dev;
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parent = device_get_parent(dev);
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if (PWMBUS_CHANNEL_COUNT(parent, &sc->base.nchannels) != 0 ||
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sc->base.nchannels == 0) {
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device_printf(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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/*
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* Attach the children found in the fdt node of the hardware controller.
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* Hardware controllers must implement the ofw_bus_get_node method so
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* that our call to ofw_bus_get_node() gets back the controller's node.
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*/
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any_children = false;
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node = ofw_bus_get_node(dev);
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for (node = OF_child(node); node != 0; node = OF_peer(node)) {
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/*
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* The child has to have a reg property; its value is the
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* channel number so range-check it.
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*/
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if (OF_getencprop(node, "reg", &chan, sizeof(chan)) == -1)
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continue;
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if (chan >= sc->base.nchannels)
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continue;
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if ((child = ofw_pwmbus_add_child(dev, 0, NULL, -1)) == NULL)
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continue;
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ivars = device_get_ivars(child);
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ivars->base.pi_channel = chan;
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/* Set up the standard ofw devinfo. */
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if (ofw_bus_gen_setup_devinfo(&ivars->devinfo, node) != 0) {
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device_delete_child(dev, child);
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continue;
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}
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any_children = true;
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}
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/*
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* If we didn't find any children in the fdt data, add a pwmc(4) child
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* for each channel, like the base pwmbus does. The idea is that if
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* there is any fdt data, then we do exactly what it says and nothing
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* more, otherwise we just provide generic userland access to all the
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* pwm channels that exist like the base pwmbus's attach code does.
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*/
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if (!any_children) {
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for (chan = 0; chan < sc->base.nchannels; ++chan) {
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child = ofw_pwmbus_add_child(dev, 0, "pwmc", -1);
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if (child == NULL) {
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device_printf(dev, "failed to add pwmc child "
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" device 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->base.pi_channel = chan;
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}
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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 device_method_t ofw_pwmbus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ofw_pwmbus_probe),
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DEVMETHOD(device_attach, ofw_pwmbus_attach),
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/* Bus interface */
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DEVMETHOD(bus_child_pnpinfo, ofw_bus_gen_child_pnpinfo),
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DEVMETHOD(bus_add_child, ofw_pwmbus_add_child),
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DEVMETHOD(bus_child_deleted, ofw_pwmbus_child_deleted),
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/* ofw_bus interface */
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DEVMETHOD(ofw_bus_get_devinfo, ofw_pwmbus_get_devinfo),
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DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
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DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
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DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
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DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
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DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
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DEVMETHOD_END
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};
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devclass_t ofw_pwmbus_devclass;
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DEFINE_CLASS_1(pwmbus, ofw_pwmbus_driver, ofw_pwmbus_methods,
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sizeof(struct pwmbus_softc), pwmbus_driver);
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EARLY_DRIVER_MODULE(ofw_pwmbus, pwm, ofw_pwmbus_driver, ofw_pwmbus_devclass,
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0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(ofw_pwmbus, 1);
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MODULE_DEPEND(ofw_pwmbus, pwmbus, 1, 1, 1);
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