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      1 /*	$NetBSD: autoconf.c,v 1.65 2026/05/11 10:31:50 macallan Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2025 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.65 2026/05/11 10:31:50 macallan Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/device.h>
     35 
     36 #include <dev/ofw/openfirm.h>
     37 
     38 #include <powerpc/ofw_machdep.h>
     39 
     40 static const char *
     41 sensor_prop_name(char *buf, size_t buflen, int num)
     42 {
     43 	snprintf(buf, buflen, "s%02x", num);
     44 	return buf;
     45 }
     46 
     47 static void
     48 macppc_assign_sensor_names_old(device_t dev, device_t gparent, int phandle)
     49 {
     50 	uint32_t ids[4];
     51 	char buf[256];
     52 	char num[8];
     53 
     54 	/* Only if the grandparent is ki2c. */
     55 	if (! device_is_a(gparent, "ki2c")) {
     56 		return;
     57 	}
     58 
     59 	int len = OF_getprop(phandle, "hwsensor-id", ids, sizeof(ids));
     60 
     61 	if (len <= 0) {
     62 		/*
     63 		 * No info, fill in what we know based on the model.
     64 		 */
     65 		int root = OF_finddevice("/");
     66 		if (OF_getprop(phandle, "name", buf, sizeof(buf)) <= 0) {
     67 			return;
     68 		}
     69 		if (strcmp(buf, "temp-monitor") == 0) {
     70 			if (OF_getprop(root, "model", buf, sizeof(buf)) <= 0) {
     71 				return;
     72 			}
     73 			if (strcmp(buf, "RackMac1,2") == 0) {
     74 				device_setprop_string(dev, "s00", "CPU");
     75 				return;
     76 			}
     77 		}
     78 		return;
     79 	}
     80 	int sllen = OF_getprop(phandle, "hwsensor-location", buf,
     81 			       sizeof(buf));
     82 	if (sllen <= 0) {
     83 		/* Well that sucks! */
     84 		return;
     85 	}
     86 	len >>= 2;
     87 	for (int i = 0; i < len; i++) {
     88 		const char *descr = strlist_string(buf, sllen, i);
     89 		if (descr == NULL) {
     90 			/* Ran out of descriptions. */
     91 			return;
     92 		}
     93 		/*
     94 		 * Yes, array index instead if ids[i].  The old
     95 		 * OpenFirmware encoding was apparently ... odd.
     96 		 * But macallan@ assures me this is correct.
     97 		 */
     98 		device_setprop_string(dev,
     99 				      sensor_prop_name(num, sizeof(num), i),
    100 				      descr);
    101 	}
    102 }
    103 
    104 static void
    105 macppc_assign_sensor_names(device_t dev, device_t gparent)
    106 {
    107 	int phandle = devhandle_to_of(device_handle(dev));
    108 	int snode;
    109 
    110 	snode = OF_child(phandle);
    111 	if (snode == 0) {
    112 		macppc_assign_sensor_names_old(dev, gparent, phandle);
    113 		return;
    114 	}
    115 
    116 	for (; snode != 0; snode = OF_peer(snode)) {
    117 		char descr[64], num[8];
    118 		int reg;
    119 
    120 		if (OF_getprop(snode, "reg", &reg, sizeof(reg)) < sizeof(reg)) {
    121 			continue;
    122 		}
    123 		if (OF_getprop(snode, "location", descr, sizeof(descr)) <= 0) {
    124 			continue;
    125 		}
    126 		device_setprop_string(dev,
    127 		    sensor_prop_name(num, sizeof(num), reg), descr);
    128 	}
    129 }
    130 
    131 void
    132 device_register(device_t dev, void *aux)
    133 {
    134 	ofw_device_register(dev, aux);
    135 
    136 	/*
    137 	 * Look for sensors hung off an I2C controller and pass
    138 	 * along the sensor name properties.
    139 	 */
    140 	device_t parent = device_parent(dev);
    141 	if (device_is_a(parent, "iic") &&
    142 	    devhandle_type(device_handle(dev)) == DEVHANDLE_TYPE_OF) {
    143 		macppc_assign_sensor_names(dev, device_parent(parent));
    144 	}
    145 }
    146