1 /* $NetBSD: acpi_i2c.c,v 1.12 2022/07/23 03:08:17 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2017, 2021 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Manuel Bouyer. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: acpi_i2c.c,v 1.12 2022/07/23 03:08:17 thorpej Exp $"); 34 35 #include <dev/acpi/acpireg.h> 36 #include <dev/acpi/acpivar.h> 37 #include <dev/acpi/acpi_i2c.h> 38 #include <dev/i2c/i2cvar.h> 39 40 #include <sys/kmem.h> 41 42 #define _COMPONENT ACPI_BUS_COMPONENT 43 ACPI_MODULE_NAME ("acpi_i2c") 44 45 struct acpi_i2c_context { 46 uint16_t i2c_addr; 47 }; 48 49 static ACPI_STATUS 50 acpi_i2c_resource_parse_callback(ACPI_RESOURCE *res, void *context) 51 { 52 struct acpi_i2c_context *i2cc = context; 53 54 switch (res->Type) { 55 case ACPI_RESOURCE_TYPE_END_TAG: 56 break; 57 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 58 switch (res->Data.I2cSerialBus.Type) { 59 case ACPI_RESOURCE_SERIAL_TYPE_I2C: 60 i2cc->i2c_addr = res->Data.I2cSerialBus.SlaveAddress; 61 break; 62 } 63 break; 64 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 65 break; 66 default: 67 printf("resource type 0x%x ignored\n", res->Type); 68 } 69 return_ACPI_STATUS(AE_OK); 70 } 71 72 static void 73 acpi_enter_i2c_device(struct acpi_devnode *ad, prop_array_t array) 74 { 75 prop_dictionary_t dev; 76 struct acpi_i2c_context i2cc; 77 ACPI_STATUS rv; 78 char *clist; 79 size_t clist_size; 80 81 memset(&i2cc, 0, sizeof(i2cc)); 82 rv = AcpiWalkResources(ad->ad_handle, "_CRS", 83 acpi_i2c_resource_parse_callback, &i2cc); 84 if (ACPI_FAILURE(rv)) { 85 aprint_error("ACPI: unable to get resources " 86 "for %s: %s\n", ad->ad_name, 87 AcpiFormatException(rv)); 88 return; 89 } 90 if (i2cc.i2c_addr == 0) 91 return; 92 dev = prop_dictionary_create(); 93 if (dev == NULL) { 94 aprint_error("ignoring device %s (no memory)\n", 95 ad->ad_name); 96 return; 97 } 98 clist = acpi_pack_compat_list(ad, &clist_size); 99 if (clist == NULL) { 100 prop_object_release(dev); 101 aprint_error("ignoring device %s (no _HID or _CID)\n", 102 ad->ad_name); 103 return; 104 } 105 prop_dictionary_set_string(dev, "name", ad->ad_name); 106 prop_dictionary_set_uint32(dev, "addr", i2cc.i2c_addr); 107 prop_dictionary_set_uint64(dev, "cookie", (uintptr_t)ad->ad_handle); 108 prop_dictionary_set_uint32(dev, "cookietype", I2C_COOKIE_ACPI); 109 prop_dictionary_set_data(dev, "compatible", clist, clist_size); 110 kmem_free(clist, clist_size); 111 112 prop_array_add(array, dev); 113 prop_object_release(dev); 114 } 115 116 prop_array_t 117 acpi_enter_i2c_devs(device_t dev, struct acpi_devnode *devnode) 118 { 119 struct acpi_devnode *ad; 120 prop_array_t array = prop_array_create(); 121 122 if (array == NULL) 123 return NULL; 124 125 SIMPLEQ_FOREACH(ad, &devnode->ad_child_head, ad_child_list) { 126 if (ad->ad_devinfo->Type != ACPI_TYPE_DEVICE) 127 continue; 128 if (!acpi_device_present(ad->ad_handle)) 129 continue; 130 acpi_enter_i2c_device(ad, array); 131 } 132 133 if (dev != NULL) { 134 acpi_claim_childdevs(dev, devnode); 135 } 136 137 return array; 138 } 139