1 /****************************************************************************** 2 * 3 * This file is provided under a dual BSD/GPLv2 license. When using or 4 * redistributing this file, you may do so under either license. 5 * 6 * GPL LICENSE SUMMARY 7 * 8 * Copyright(c) 2017 Intel Deutschland GmbH 9 * Copyright (C) 2019 Intel Corporation 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of version 2 of the GNU General Public License as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * The full GNU General Public License is included in this distribution 21 * in the file called COPYING. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 * BSD LICENSE 28 * 29 * Copyright(c) 2017 Intel Deutschland GmbH 30 * Copyright (C) 2019 Intel Corporation 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 37 * * Redistributions of source code must retain the above copyright 38 * notice, this list of conditions and the following disclaimer. 39 * * Redistributions in binary form must reproduce the above copyright 40 * notice, this list of conditions and the following disclaimer in 41 * the documentation and/or other materials provided with the 42 * distribution. 43 * * Neither the name Intel Corporation nor the names of its 44 * contributors may be used to endorse or promote products derived 45 * from this software without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 48 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 49 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 50 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 51 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 53 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 54 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 55 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 56 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 57 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 58 * 59 *****************************************************************************/ 60 61 #include "iwl-drv.h" 62 #include "iwl-debug.h" 63 #include "acpi.h" 64 65 void *iwl_acpi_get_object(struct device *dev, acpi_string method) 66 { 67 acpi_handle root_handle; 68 acpi_handle handle; 69 struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; 70 acpi_status status; 71 72 root_handle = ACPI_HANDLE(dev); 73 if (!root_handle) { 74 IWL_DEBUG_DEV_RADIO(dev, 75 "Could not retrieve root port ACPI handle\n"); 76 return ERR_PTR(-ENOENT); 77 } 78 79 /* Get the method's handle */ 80 status = acpi_get_handle(root_handle, method, &handle); 81 if (ACPI_FAILURE(status)) { 82 IWL_DEBUG_DEV_RADIO(dev, "%s method not found\n", method); 83 return ERR_PTR(-ENOENT); 84 } 85 86 /* Call the method with no arguments */ 87 status = acpi_evaluate_object(handle, NULL, NULL, &buf); 88 if (ACPI_FAILURE(status)) { 89 IWL_DEBUG_DEV_RADIO(dev, "%s invocation failed (0x%x)\n", 90 method, status); 91 return ERR_PTR(-ENOENT); 92 } 93 94 return buf.pointer; 95 } 96 IWL_EXPORT_SYMBOL(iwl_acpi_get_object); 97 98 union acpi_object *iwl_acpi_get_wifi_pkg(struct device *dev, 99 union acpi_object *data, 100 int data_size) 101 { 102 int i; 103 union acpi_object *wifi_pkg; 104 105 /* 106 * We need at least one entry in the wifi package that 107 * describes the domain, and one more entry, otherwise there's 108 * no point in reading it. 109 */ 110 if (WARN_ON_ONCE(data_size < 2)) 111 return ERR_PTR(-EINVAL); 112 113 /* 114 * We need at least two packages, one for the revision and one 115 * for the data itself. Also check that the revision is valid 116 * (i.e. it is an integer set to 0). 117 */ 118 if (data->type != ACPI_TYPE_PACKAGE || 119 data->package.count < 2 || 120 data->package.elements[0].type != ACPI_TYPE_INTEGER || 121 data->package.elements[0].integer.value != 0) { 122 IWL_DEBUG_DEV_RADIO(dev, "Unsupported packages structure\n"); 123 return ERR_PTR(-EINVAL); 124 } 125 126 /* loop through all the packages to find the one for WiFi */ 127 for (i = 1; i < data->package.count; i++) { 128 union acpi_object *domain; 129 130 wifi_pkg = &data->package.elements[i]; 131 132 /* skip entries that are not a package with the right size */ 133 if (wifi_pkg->type != ACPI_TYPE_PACKAGE || 134 wifi_pkg->package.count != data_size) 135 continue; 136 137 domain = &wifi_pkg->package.elements[0]; 138 if (domain->type == ACPI_TYPE_INTEGER && 139 domain->integer.value == ACPI_WIFI_DOMAIN) 140 goto found; 141 } 142 143 return ERR_PTR(-ENOENT); 144 145 found: 146 return wifi_pkg; 147 } 148 IWL_EXPORT_SYMBOL(iwl_acpi_get_wifi_pkg); 149 150 int iwl_acpi_get_mcc(struct device *dev, char *mcc) 151 { 152 union acpi_object *wifi_pkg, *data; 153 u32 mcc_val; 154 int ret; 155 156 data = iwl_acpi_get_object(dev, ACPI_WRDD_METHOD); 157 if (IS_ERR(data)) 158 return PTR_ERR(data); 159 160 wifi_pkg = iwl_acpi_get_wifi_pkg(dev, data, ACPI_WRDD_WIFI_DATA_SIZE); 161 if (IS_ERR(wifi_pkg)) { 162 ret = PTR_ERR(wifi_pkg); 163 goto out_free; 164 } 165 166 if (wifi_pkg->package.elements[1].type != ACPI_TYPE_INTEGER) { 167 ret = -EINVAL; 168 goto out_free; 169 } 170 171 mcc_val = wifi_pkg->package.elements[1].integer.value; 172 173 mcc[0] = (mcc_val >> 8) & 0xff; 174 mcc[1] = mcc_val & 0xff; 175 mcc[2] = '\0'; 176 177 ret = 0; 178 out_free: 179 kfree(data); 180 return ret; 181 } 182 IWL_EXPORT_SYMBOL(iwl_acpi_get_mcc); 183 184 u64 iwl_acpi_get_pwr_limit(struct device *dev) 185 { 186 union acpi_object *data, *wifi_pkg; 187 u64 dflt_pwr_limit; 188 189 data = iwl_acpi_get_object(dev, ACPI_SPLC_METHOD); 190 if (IS_ERR(data)) { 191 dflt_pwr_limit = 0; 192 goto out; 193 } 194 195 wifi_pkg = iwl_acpi_get_wifi_pkg(dev, data, 196 ACPI_SPLC_WIFI_DATA_SIZE); 197 if (IS_ERR(wifi_pkg) || 198 wifi_pkg->package.elements[1].integer.value != ACPI_TYPE_INTEGER) { 199 dflt_pwr_limit = 0; 200 goto out_free; 201 } 202 203 dflt_pwr_limit = wifi_pkg->package.elements[1].integer.value; 204 out_free: 205 kfree(data); 206 out: 207 return dflt_pwr_limit; 208 } 209 IWL_EXPORT_SYMBOL(iwl_acpi_get_pwr_limit); 210 211 int iwl_acpi_get_eckv(struct device *dev, u32 *extl_clk) 212 { 213 union acpi_object *wifi_pkg, *data; 214 int ret; 215 216 data = iwl_acpi_get_object(dev, ACPI_ECKV_METHOD); 217 if (IS_ERR(data)) 218 return PTR_ERR(data); 219 220 wifi_pkg = iwl_acpi_get_wifi_pkg(dev, data, ACPI_ECKV_WIFI_DATA_SIZE); 221 if (IS_ERR(wifi_pkg)) { 222 ret = PTR_ERR(wifi_pkg); 223 goto out_free; 224 } 225 226 if (wifi_pkg->package.elements[1].type != ACPI_TYPE_INTEGER) { 227 ret = -EINVAL; 228 goto out_free; 229 } 230 231 *extl_clk = wifi_pkg->package.elements[1].integer.value; 232 233 ret = 0; 234 235 out_free: 236 kfree(data); 237 return ret; 238 } 239 IWL_EXPORT_SYMBOL(iwl_acpi_get_eckv); 240