/*      $NetBSD: autoconf.c,v 1.65 2026/05/11 10:31:50 macallan Exp $   */

/*
 * Copyright (c) 2025 The NetBSD Foundation, Inc.
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.65 2026/05/11 10:31:50 macallan Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <dev/ofw/openfirm.h>

#include <powerpc/ofw_machdep.h>

static const char *
sensor_prop_name(char *buf, size_t buflen, int num)
{
        snprintf(buf, buflen, "s%02x", num);
        return buf;
}

static void
macppc_assign_sensor_names_old(device_t dev, device_t gparent, int phandle)
{
        uint32_t ids[4];
        char buf[256];
        char num[8];

        /* Only if the grandparent is ki2c. */
        if (! device_is_a(gparent, "ki2c")) {
                return;
        }

        int len = OF_getprop(phandle, "hwsensor-id", ids, sizeof(ids));

        if (len <= 0) {
                /*
                 * No info, fill in what we know based on the model.
                 */
                int root = OF_finddevice("/");
                if (OF_getprop(phandle, "name", buf, sizeof(buf)) <= 0) {
                        return;
                }
                if (strcmp(buf, "temp-monitor") == 0) {
                        if (OF_getprop(root, "model", buf, sizeof(buf)) <= 0) {
                                return;
                        }
                        if (strcmp(buf, "RackMac1,2") == 0) {
                                device_setprop_string(dev, "s00", "CPU");
                                return;
                        }
                }
                return;
        }
        int sllen = OF_getprop(phandle, "hwsensor-location", buf,
                               sizeof(buf));
        if (sllen <= 0) {
                /* Well that sucks! */
                return;
        }
        len >>= 2;
        for (int i = 0; i < len; i++) {
                const char *descr = strlist_string(buf, sllen, i);
                if (descr == NULL) {
                        /* Ran out of descriptions. */
                        return;
                }
                /*
                 * Yes, array index instead if ids[i].  The old
                 * OpenFirmware encoding was apparently ... odd.
                 * But macallan@ assures me this is correct.
                 */
                device_setprop_string(dev,
                                      sensor_prop_name(num, sizeof(num), i),
                                      descr);
        }
}

static void
macppc_assign_sensor_names(device_t dev, device_t gparent)
{
        int phandle = devhandle_to_of(device_handle(dev));
        int snode;

        snode = OF_child(phandle);
        if (snode == 0) {
                macppc_assign_sensor_names_old(dev, gparent, phandle);
                return;
        }

        for (; snode != 0; snode = OF_peer(snode)) {
                char descr[64], num[8];
                int reg;

                if (OF_getprop(snode, "reg", &reg, sizeof(reg)) < sizeof(reg)) {
                        continue;
                }
                if (OF_getprop(snode, "location", descr, sizeof(descr)) <= 0) {
                        continue;
                }
                device_setprop_string(dev,
                    sensor_prop_name(num, sizeof(num), reg), descr);
        }
}

void
device_register(device_t dev, void *aux)
{
        ofw_device_register(dev, aux);

        /*
         * Look for sensors hung off an I2C controller and pass
         * along the sensor name properties.
         */
        device_t parent = device_parent(dev);
        if (device_is_a(parent, "iic") &&
            devhandle_type(device_handle(dev)) == DEVHANDLE_TYPE_OF) {
                macppc_assign_sensor_names(dev, device_parent(parent));
        }
}