acpi_i2c.c revision 1.1
1 /* $NetBSD: acpi_i2c.c,v 1.1 2017/12/10 16:51:30 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 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 1.1 2017/12/10 16:51:30 bouyer Exp $"); 34 35 #include <dev/acpi/acpireg.h> 36 #include <dev/acpi/acpivar.h> 37 #include <dev/acpi/acpi_i2c.h> 38 39 static void 40 acpi_enter_i2c_hid(struct acpi_devnode *devnode, prop_dictionary_t dev) 41 { 42 ACPI_OBJECT_LIST arg; 43 ACPI_OBJECT obj[4]; 44 ACPI_OBJECT *osc; 45 ACPI_BUFFER buf; 46 ACPI_STATUS rv; 47 /* 3cdff6f7-4267-4555-ad05-b30a3d8938de */ 48 static uint8_t i2c_hid_guid[] = { 49 0xF7, 0xF6, 0xDF, 0x3C, 0x67, 0x42, 0x55, 0x45, 50 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE, 51 }; 52 53 arg.Count = 4; 54 arg.Pointer = obj; 55 56 obj[0].Type = ACPI_TYPE_BUFFER; 57 obj[0].Buffer.Length = sizeof(i2c_hid_guid); 58 obj[0].Buffer.Pointer = i2c_hid_guid; 59 60 /* rev */ 61 obj[1].Type = ACPI_TYPE_INTEGER; 62 obj[1].Integer.Value = 1; 63 64 /* func */ 65 obj[2].Type = ACPI_TYPE_INTEGER; 66 obj[2].Integer.Value = 1; 67 68 obj[3].Type = ACPI_TYPE_ANY; 69 obj[3].Buffer.Length = 0; 70 71 buf.Pointer = NULL; 72 buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER; 73 74 rv = AcpiEvaluateObject(devnode->ad_handle, "_DSM", &arg, &buf); 75 76 if (ACPI_FAILURE(rv)) { 77 aprint_error("failed to evaluate _DSM for %s: %s\n", 78 devnode->ad_name, AcpiFormatException(rv)); 79 return; 80 } 81 82 osc = buf.Pointer; 83 if (osc->Type != ACPI_TYPE_INTEGER) { 84 aprint_error("bad _DSM return type %d for %s\n", 85 osc->Type, devnode->ad_name); 86 return; 87 } 88 prop_dictionary_set_uint32(dev, "hid-descr-addr", osc->Integer.Value); 89 } 90 91 struct acpi_i2c_id { 92 const char *id; 93 const char *compat; 94 const int compatlen; 95 void (*parse)(struct acpi_devnode *, prop_dictionary_t); 96 }; 97 98 static const struct acpi_i2c_id acpi_i2c_ids[] = { 99 { 100 .id = "PNP0C50", 101 .compat = "hid-over-i2c", 102 .compatlen = 13, 103 .parse = acpi_enter_i2c_hid 104 }, 105 { 106 .id = "ACPI0C50", 107 .compat = "hid-over-i2c", 108 .compatlen = 13, 109 .parse = acpi_enter_i2c_hid 110 }, 111 { 112 .id = NULL, 113 .compat = NULL, 114 .compatlen = 0, 115 .parse = NULL 116 } 117 }; 118 119 static const struct acpi_i2c_id * 120 acpi_i2c_search(const char *name) 121 { 122 int i; 123 for (i = 0; acpi_i2c_ids[i].id != NULL; i++) { 124 if (strcmp(name, acpi_i2c_ids[i].id) == 0) 125 return &acpi_i2c_ids[i]; 126 } 127 return NULL; 128 } 129 130 struct acpi_i2c_context { 131 uint16_t i2c_addr; 132 }; 133 134 static ACPI_STATUS 135 acpi_i2c_resource_parse_callback(ACPI_RESOURCE *res, void *context) 136 { 137 struct acpi_i2c_context *i2cc = context; 138 139 switch (res->Type) { 140 case ACPI_RESOURCE_TYPE_END_TAG: 141 break; 142 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 143 switch (res->Data.I2cSerialBus.Type) { 144 case ACPI_RESOURCE_SERIAL_TYPE_I2C: 145 i2cc->i2c_addr = res->Data.I2cSerialBus.SlaveAddress; 146 break; 147 } 148 break; 149 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 150 break; 151 default: 152 printf("ressource type 0x%x ignored\n", res->Type); 153 } 154 return_ACPI_STATUS(AE_OK); 155 } 156 157 static void 158 acpi_enter_i2c_device(struct acpi_devnode *ad, prop_array_t array) 159 { 160 prop_dictionary_t dev; 161 struct acpi_i2c_context i2cc; 162 ACPI_STATUS rv; 163 int cidi; 164 ACPI_PNP_DEVICE_ID_LIST *idlist; 165 const char *name; 166 static const struct acpi_i2c_id *i2c_id; 167 168 memset(&i2cc, 0, sizeof(i2cc)); 169 rv = AcpiWalkResources(ad->ad_handle, "_CRS", 170 acpi_i2c_resource_parse_callback, &i2cc); 171 if (ACPI_FAILURE(rv)) { 172 aprint_error("ACPI: unable to get resources " 173 "for %s: %s\n", ad->ad_name, 174 AcpiFormatException(rv)); 175 return; 176 } 177 if (i2cc.i2c_addr == 0) 178 return; 179 dev = prop_dictionary_create(); 180 if (dev == NULL) { 181 aprint_error("ignoring device %s (no memory)\n", 182 ad->ad_name); 183 return; 184 } 185 if ((ad->ad_devinfo->Valid & ACPI_VALID_HID) == 0) 186 name = ad->ad_name; 187 else 188 name = ad->ad_devinfo->HardwareId.String; 189 prop_dictionary_set_cstring(dev, "name", name); 190 prop_dictionary_set_uint32(dev, "addr", i2cc.i2c_addr); 191 prop_dictionary_set_uint64(dev, "cookie", (uintptr_t)ad->ad_handle); 192 /* first search by name, then by CID */ 193 i2c_id = acpi_i2c_search(name); 194 idlist = &ad->ad_devinfo->CompatibleIdList; 195 for (cidi = 0; 196 cidi < idlist->Count && i2c_id == NULL; 197 cidi++) { 198 i2c_id = acpi_i2c_search(idlist->Ids[cidi].String); 199 } 200 if (i2c_id != NULL) { 201 if (i2c_id->compat != NULL) { 202 prop_data_t data; 203 data = prop_data_create_data(i2c_id->compat, 204 i2c_id->compatlen); 205 prop_dictionary_set(dev, "compatible", data); 206 prop_object_release(data); 207 } 208 if (i2c_id->parse != NULL) 209 i2c_id->parse(ad, dev); 210 } 211 prop_array_add(array, dev); 212 prop_object_release(dev); 213 } 214 215 216 prop_array_t 217 acpi_enter_i2c_devs(struct acpi_devnode *devnode) 218 { 219 struct acpi_devnode *ad; 220 prop_array_t array = prop_array_create(); 221 222 if (array == NULL) 223 return NULL; 224 225 SIMPLEQ_FOREACH(ad, &devnode->ad_child_head, ad_child_list) { 226 if ((ad->ad_devinfo->Valid & ACPI_VALID_STA) == 0) 227 continue; 228 if ((ad->ad_devinfo->CurrentStatus & ACPI_STA_OK) != 229 ACPI_STA_OK) 230 continue; 231 if (ad->ad_devinfo->Type != ACPI_TYPE_DEVICE) 232 continue; 233 acpi_enter_i2c_device(ad, array); 234 } 235 return array; 236 } 237
Indexes created Tue Sep 23 14:10:03 GMT 2025