Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) |
| 4 | * |
| 5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 9 | #define pr_fmt(fmt) "ACPI: utils: " fmt |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/kernel.h> |
| 12 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/init.h> |
| 15 | #include <linux/types.h> |
Toshi Kani | fbfddae | 2012-11-21 01:36:28 +0000 | [diff] [blame] | 16 | #include <linux/hardirq.h> |
| 17 | #include <linux/acpi.h> |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 18 | #include <linux/dynamic_debug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Len Brown | a192a95 | 2009-07-28 16:45:54 -0400 | [diff] [blame] | 20 | #include "internal.h" |
Lukas Wunner | 2d12b6b | 2015-11-25 21:19:55 +0100 | [diff] [blame] | 21 | #include "sleep.h" |
Len Brown | a192a95 | 2009-07-28 16:45:54 -0400 | [diff] [blame] | 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | /* -------------------------------------------------------------------------- |
| 24 | Object Evaluation Helpers |
| 25 | -------------------------------------------------------------------------- */ |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 26 | static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) |
Harvey Harrison | 4fd7f51 | 2008-02-15 17:07:19 -0800 | [diff] [blame] | 27 | { |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 28 | acpi_handle_debug(h, "Evaluate [%s]: %s\n", p, acpi_format_exception(s)); |
Harvey Harrison | 4fd7f51 | 2008-02-15 17:07:19 -0800 | [diff] [blame] | 29 | } |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 32 | acpi_extract_package(union acpi_object *package, |
| 33 | struct acpi_buffer *format, struct acpi_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 35 | u32 size_required = 0; |
| 36 | u32 tail_offset = 0; |
| 37 | char *format_string = NULL; |
| 38 | u32 format_count = 0; |
| 39 | u32 i = 0; |
| 40 | u8 *head = NULL; |
| 41 | u8 *tail = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 44 | if (!package || (package->type != ACPI_TYPE_PACKAGE) |
| 45 | || (package->package.count < 1)) { |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 46 | pr_debug("Invalid package argument\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 47 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | if (!format || !format->pointer || (format->length < 1)) { |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 51 | pr_debug("Invalid format argument\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 52 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | } |
| 54 | |
| 55 | if (!buffer) { |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 56 | pr_debug("Invalid buffer argument\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 57 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 60 | format_count = (format->length / sizeof(char)) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | if (format_count > package->package.count) { |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 62 | pr_debug("Format specifies more objects [%d] than present [%d]\n", |
| 63 | format_count, package->package.count); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 64 | return AE_BAD_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
| 66 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 67 | format_string = format->pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | /* |
| 70 | * Calculate size_required. |
| 71 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 72 | for (i = 0; i < format_count; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | union acpi_object *element = &(package->package.elements[i]); |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | switch (element->type) { |
| 77 | |
| 78 | case ACPI_TYPE_INTEGER: |
| 79 | switch (format_string[i]) { |
| 80 | case 'N': |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 81 | size_required += sizeof(u64); |
| 82 | tail_offset += sizeof(u64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | break; |
| 84 | case 'S': |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 85 | size_required += |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 86 | sizeof(char *) + sizeof(u64) + |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 87 | sizeof(char); |
| 88 | tail_offset += sizeof(char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | break; |
| 90 | default: |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 91 | pr_debug("Invalid package element [%d]: got number, expected [%c]\n", |
| 92 | i, format_string[i]); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 93 | return AE_BAD_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | break; |
| 96 | |
| 97 | case ACPI_TYPE_STRING: |
| 98 | case ACPI_TYPE_BUFFER: |
| 99 | switch (format_string[i]) { |
| 100 | case 'S': |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 101 | size_required += |
| 102 | sizeof(char *) + |
| 103 | (element->string.length * sizeof(char)) + |
| 104 | sizeof(char); |
| 105 | tail_offset += sizeof(char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | break; |
| 107 | case 'B': |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 108 | size_required += |
Fabian Frederick | d93de34 | 2014-11-16 10:57:00 +0100 | [diff] [blame] | 109 | sizeof(u8 *) + element->buffer.length; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 110 | tail_offset += sizeof(u8 *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | break; |
| 112 | default: |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 113 | pr_debug("Invalid package element [%d] got string/buffer, expected [%c]\n", |
| 114 | i, format_string[i]); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 115 | return AE_BAD_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | break; |
Zhang Rui | e3ec483 | 2014-03-16 21:34:16 +0800 | [diff] [blame] | 118 | case ACPI_TYPE_LOCAL_REFERENCE: |
| 119 | switch (format_string[i]) { |
| 120 | case 'R': |
| 121 | size_required += sizeof(void *); |
| 122 | tail_offset += sizeof(void *); |
| 123 | break; |
| 124 | default: |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 125 | pr_debug("Invalid package element [%d] got reference, expected [%c]\n", |
| 126 | i, format_string[i]); |
Zhang Rui | e3ec483 | 2014-03-16 21:34:16 +0800 | [diff] [blame] | 127 | return AE_BAD_DATA; |
Zhang Rui | e3ec483 | 2014-03-16 21:34:16 +0800 | [diff] [blame] | 128 | } |
| 129 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | case ACPI_TYPE_PACKAGE: |
| 132 | default: |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 133 | pr_debug("Unsupported element at index=%d\n", i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | /* TBD: handle nested packages... */ |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 135 | return AE_SUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Validate output buffer. |
| 141 | */ |
Al Stone | e83dda0 | 2013-10-09 14:21:10 -0600 | [diff] [blame] | 142 | if (buffer->length == ACPI_ALLOCATE_BUFFER) { |
jhbird.choi@samsung.com | 2d0acb4 | 2014-03-20 16:35:56 +0900 | [diff] [blame] | 143 | buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); |
Al Stone | e83dda0 | 2013-10-09 14:21:10 -0600 | [diff] [blame] | 144 | if (!buffer->pointer) |
| 145 | return AE_NO_MEMORY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | buffer->length = size_required; |
Al Stone | e83dda0 | 2013-10-09 14:21:10 -0600 | [diff] [blame] | 147 | } else { |
| 148 | if (buffer->length < size_required) { |
| 149 | buffer->length = size_required; |
| 150 | return AE_BUFFER_OVERFLOW; |
| 151 | } else if (buffer->length != size_required || |
| 152 | !buffer->pointer) { |
| 153 | return AE_BAD_PARAMETER; |
| 154 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | head = buffer->pointer; |
| 158 | tail = buffer->pointer + tail_offset; |
| 159 | |
| 160 | /* |
| 161 | * Extract package data. |
| 162 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 163 | for (i = 0; i < format_count; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
| 165 | u8 **pointer = NULL; |
| 166 | union acpi_object *element = &(package->package.elements[i]); |
| 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | switch (element->type) { |
| 169 | |
| 170 | case ACPI_TYPE_INTEGER: |
| 171 | switch (format_string[i]) { |
| 172 | case 'N': |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 173 | *((u64 *) head) = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 174 | element->integer.value; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 175 | head += sizeof(u64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | break; |
| 177 | case 'S': |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 178 | pointer = (u8 **) head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | *pointer = tail; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 180 | *((u64 *) tail) = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 181 | element->integer.value; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 182 | head += sizeof(u64 *); |
| 183 | tail += sizeof(u64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | /* NULL terminate string */ |
| 185 | *tail = (char)0; |
| 186 | tail += sizeof(char); |
| 187 | break; |
| 188 | default: |
| 189 | /* Should never get here */ |
| 190 | break; |
| 191 | } |
| 192 | break; |
| 193 | |
| 194 | case ACPI_TYPE_STRING: |
| 195 | case ACPI_TYPE_BUFFER: |
| 196 | switch (format_string[i]) { |
| 197 | case 'S': |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 198 | pointer = (u8 **) head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | *pointer = tail; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 200 | memcpy(tail, element->string.pointer, |
| 201 | element->string.length); |
| 202 | head += sizeof(char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | tail += element->string.length * sizeof(char); |
| 204 | /* NULL terminate string */ |
| 205 | *tail = (char)0; |
| 206 | tail += sizeof(char); |
| 207 | break; |
| 208 | case 'B': |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 209 | pointer = (u8 **) head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | *pointer = tail; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 211 | memcpy(tail, element->buffer.pointer, |
| 212 | element->buffer.length); |
| 213 | head += sizeof(u8 *); |
Fabian Frederick | d93de34 | 2014-11-16 10:57:00 +0100 | [diff] [blame] | 214 | tail += element->buffer.length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | break; |
| 216 | default: |
| 217 | /* Should never get here */ |
| 218 | break; |
| 219 | } |
| 220 | break; |
Zhang Rui | e3ec483 | 2014-03-16 21:34:16 +0800 | [diff] [blame] | 221 | case ACPI_TYPE_LOCAL_REFERENCE: |
| 222 | switch (format_string[i]) { |
| 223 | case 'R': |
| 224 | *(void **)head = |
| 225 | (void *)element->reference.handle; |
| 226 | head += sizeof(void *); |
| 227 | break; |
| 228 | default: |
| 229 | /* Should never get here */ |
| 230 | break; |
| 231 | } |
| 232 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | case ACPI_TYPE_PACKAGE: |
| 234 | /* TBD: handle nested packages... */ |
| 235 | default: |
| 236 | /* Should never get here */ |
| 237 | break; |
| 238 | } |
| 239 | } |
| 240 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 241 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | EXPORT_SYMBOL(acpi_extract_package); |
| 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 247 | acpi_evaluate_integer(acpi_handle handle, |
| 248 | acpi_string pathname, |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 249 | struct acpi_object_list *arguments, unsigned long long *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 251 | acpi_status status = AE_OK; |
Pavel Machek | 4059907 | 2008-11-25 12:05:08 +0100 | [diff] [blame] | 252 | union acpi_object element; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 253 | struct acpi_buffer buffer = { 0, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | if (!data) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 256 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | buffer.length = sizeof(union acpi_object); |
Pavel Machek | 4059907 | 2008-11-25 12:05:08 +0100 | [diff] [blame] | 259 | buffer.pointer = &element; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); |
| 261 | if (ACPI_FAILURE(status)) { |
| 262 | acpi_util_eval_error(handle, pathname, status); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 263 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
| 265 | |
Pavel Machek | 4059907 | 2008-11-25 12:05:08 +0100 | [diff] [blame] | 266 | if (element.type != ACPI_TYPE_INTEGER) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | acpi_util_eval_error(handle, pathname, AE_BAD_DATA); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 268 | return AE_BAD_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
Pavel Machek | 4059907 | 2008-11-25 12:05:08 +0100 | [diff] [blame] | 271 | *data = element.integer.value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 273 | acpi_handle_debug(handle, "Return value [%llu]\n", *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 275 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 278 | EXPORT_SYMBOL(acpi_evaluate_integer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Calvin Johnson | 7ec1643 | 2021-06-11 13:53:56 +0300 | [diff] [blame] | 280 | int acpi_get_local_address(acpi_handle handle, u32 *addr) |
| 281 | { |
| 282 | unsigned long long adr; |
| 283 | acpi_status status; |
| 284 | |
| 285 | status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr); |
| 286 | if (ACPI_FAILURE(status)) |
| 287 | return -ENODATA; |
| 288 | |
| 289 | *addr = (u32)adr; |
| 290 | return 0; |
| 291 | } |
| 292 | EXPORT_SYMBOL(acpi_get_local_address); |
| 293 | |
Stefan Binding | 93064e1 | 2022-07-07 16:10:36 +0100 | [diff] [blame] | 294 | #define ACPI_MAX_SUB_BUF_SIZE 9 |
| 295 | |
| 296 | const char *acpi_get_subsystem_id(acpi_handle handle) |
| 297 | { |
| 298 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 299 | union acpi_object *obj; |
| 300 | acpi_status status; |
| 301 | const char *sub; |
| 302 | size_t len; |
| 303 | |
| 304 | status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer); |
| 305 | if (ACPI_FAILURE(status)) { |
| 306 | acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status); |
| 307 | return ERR_PTR(-ENODATA); |
| 308 | } |
| 309 | |
| 310 | obj = buffer.pointer; |
| 311 | if (obj->type == ACPI_TYPE_STRING) { |
| 312 | len = strlen(obj->string.pointer); |
| 313 | if (len < ACPI_MAX_SUB_BUF_SIZE && len > 0) { |
| 314 | sub = kstrdup(obj->string.pointer, GFP_KERNEL); |
| 315 | if (!sub) |
| 316 | sub = ERR_PTR(-ENOMEM); |
| 317 | } else { |
| 318 | acpi_handle_err(handle, "ACPI _SUB Length %zu is Invalid\n", len); |
| 319 | sub = ERR_PTR(-ENODATA); |
| 320 | } |
| 321 | } else { |
| 322 | acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n"); |
| 323 | sub = ERR_PTR(-ENODATA); |
| 324 | } |
| 325 | |
| 326 | acpi_os_free(buffer.pointer); |
| 327 | |
| 328 | return sub; |
| 329 | } |
| 330 | EXPORT_SYMBOL_GPL(acpi_get_subsystem_id); |
| 331 | |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 332 | bool acpi_evaluate_reference(acpi_handle handle, acpi_string pathname, |
| 333 | struct acpi_object_list *arguments, |
| 334 | struct acpi_handle_list *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 336 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 337 | union acpi_object *package; |
| 338 | acpi_status status; |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 339 | bool ret = false; |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 340 | u32 i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Jonathan Bergh | 6b54bdd | 2023-09-28 23:48:23 +0200 | [diff] [blame] | 342 | if (!list) |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 343 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | /* Evaluate object. */ |
| 346 | |
| 347 | status = acpi_evaluate_object(handle, pathname, arguments, &buffer); |
| 348 | if (ACPI_FAILURE(status)) |
| 349 | goto end; |
| 350 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 351 | package = buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 353 | if (buffer.length == 0 || !package || |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 354 | package->type != ACPI_TYPE_PACKAGE || !package->package.count) |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 355 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | list->count = package->package.count; |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 358 | list->handles = kcalloc(list->count, sizeof(*list->handles), GFP_KERNEL); |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 359 | if (!list->handles) |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 360 | goto err_clear; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | /* Extract package data. */ |
| 363 | |
| 364 | for (i = 0; i < list->count; i++) { |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 365 | union acpi_object *element = &(package->package.elements[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 367 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE || |
| 368 | !element->reference.handle) |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 369 | goto err_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | /* Get the acpi_handle. */ |
| 372 | |
| 373 | list->handles[i] = element->reference.handle; |
Rafael J. Wysocki | fba2ae3 | 2021-01-20 20:00:32 +0100 | [diff] [blame] | 374 | acpi_handle_debug(list->handles[i], "Found in reference list\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
| 376 | |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 377 | ret = true; |
| 378 | |
Rafael J. Wysocki | 8f0b960 | 2023-12-07 19:28:10 +0100 | [diff] [blame] | 379 | end: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 380 | kfree(buffer.pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
Rafael J. Wysocki | 6909e0f | 2023-12-08 21:06:04 +0100 | [diff] [blame] | 382 | return ret; |
Rafael J. Wysocki | 87824da | 2023-12-08 21:05:19 +0100 | [diff] [blame] | 383 | |
| 384 | err_free: |
| 385 | kfree(list->handles); |
| 386 | list->handles = NULL; |
| 387 | |
| 388 | err_clear: |
| 389 | list->count = 0; |
| 390 | |
| 391 | err: |
| 392 | acpi_util_eval_error(handle, pathname, status); |
| 393 | goto end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 396 | EXPORT_SYMBOL(acpi_evaluate_reference); |
Matthew Garrett | 38ac0f1 | 2012-05-11 16:08:26 +0800 | [diff] [blame] | 397 | |
Rafael J. Wysocki | 2e57d10 | 2023-09-27 13:17:25 -0700 | [diff] [blame] | 398 | /** |
| 399 | * acpi_handle_list_equal - Check if two ACPI handle lists are the same |
| 400 | * @list1: First list to compare. |
| 401 | * @list2: Second list to compare. |
| 402 | * |
| 403 | * Return true if the given ACPI handle lists are of the same size and |
| 404 | * contain the same ACPI handles in the same order. Otherwise, return false. |
| 405 | */ |
| 406 | bool acpi_handle_list_equal(struct acpi_handle_list *list1, |
| 407 | struct acpi_handle_list *list2) |
| 408 | { |
| 409 | return list1->count == list2->count && |
| 410 | !memcmp(list1->handles, list2->handles, |
Rafael J. Wysocki | 1feb042 | 2023-12-08 21:06:45 +0100 | [diff] [blame] | 411 | list1->count * sizeof(*list1->handles)); |
Rafael J. Wysocki | 2e57d10 | 2023-09-27 13:17:25 -0700 | [diff] [blame] | 412 | } |
| 413 | EXPORT_SYMBOL_GPL(acpi_handle_list_equal); |
| 414 | |
| 415 | /** |
| 416 | * acpi_handle_list_replace - Replace one ACPI handle list with another |
| 417 | * @dst: ACPI handle list to replace. |
| 418 | * @src: Source ACPI handle list. |
| 419 | * |
| 420 | * Free the handles table in @dst, move the handles table from @src to @dst, |
| 421 | * copy count from @src to @dst and clear @src. |
| 422 | */ |
| 423 | void acpi_handle_list_replace(struct acpi_handle_list *dst, |
| 424 | struct acpi_handle_list *src) |
| 425 | { |
| 426 | if (dst->count) |
| 427 | kfree(dst->handles); |
| 428 | |
| 429 | dst->count = src->count; |
| 430 | dst->handles = src->handles; |
| 431 | |
| 432 | src->handles = NULL; |
| 433 | src->count = 0; |
| 434 | } |
| 435 | EXPORT_SYMBOL_GPL(acpi_handle_list_replace); |
| 436 | |
| 437 | /** |
| 438 | * acpi_handle_list_free - Free the handles table in an ACPI handle list |
| 439 | * @list: ACPI handle list to free. |
| 440 | * |
| 441 | * Free the handles table in @list and clear its count field. |
| 442 | */ |
| 443 | void acpi_handle_list_free(struct acpi_handle_list *list) |
| 444 | { |
| 445 | if (!list->count) |
| 446 | return; |
| 447 | |
| 448 | kfree(list->handles); |
| 449 | list->count = 0; |
| 450 | } |
| 451 | EXPORT_SYMBOL_GPL(acpi_handle_list_free); |
| 452 | |
Rafael J. Wysocki | d70d141 | 2023-12-14 12:07:55 +0100 | [diff] [blame] | 453 | /** |
| 454 | * acpi_device_dep - Check ACPI device dependency |
| 455 | * @target: ACPI handle of the target ACPI device. |
| 456 | * @match: ACPI handle to look up in the target's _DEP list. |
| 457 | * |
| 458 | * Return true if @match is present in the list returned by _DEP for |
| 459 | * @target or false otherwise. |
| 460 | */ |
| 461 | bool acpi_device_dep(acpi_handle target, acpi_handle match) |
| 462 | { |
| 463 | struct acpi_handle_list dep_devices; |
| 464 | bool ret = false; |
| 465 | int i; |
| 466 | |
| 467 | if (!acpi_has_method(target, "_DEP")) |
| 468 | return false; |
| 469 | |
| 470 | if (!acpi_evaluate_reference(target, "_DEP", NULL, &dep_devices)) { |
| 471 | acpi_handle_debug(target, "Failed to evaluate _DEP.\n"); |
| 472 | return false; |
| 473 | } |
| 474 | |
| 475 | for (i = 0; i < dep_devices.count; i++) { |
| 476 | if (dep_devices.handles[i] == match) { |
| 477 | ret = true; |
| 478 | break; |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | acpi_handle_list_free(&dep_devices); |
| 483 | return ret; |
| 484 | } |
| 485 | EXPORT_SYMBOL_GPL(acpi_device_dep); |
| 486 | |
Matthew Garrett | 38ac0f1 | 2012-05-11 16:08:26 +0800 | [diff] [blame] | 487 | acpi_status |
Feng Tang | 8ede06a | 2012-08-21 09:56:58 +0800 | [diff] [blame] | 488 | acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) |
Matthew Garrett | 38ac0f1 | 2012-05-11 16:08:26 +0800 | [diff] [blame] | 489 | { |
| 490 | acpi_status status; |
| 491 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 492 | union acpi_object *output; |
| 493 | |
| 494 | status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); |
| 495 | |
| 496 | if (ACPI_FAILURE(status)) |
| 497 | return status; |
| 498 | |
| 499 | output = buffer.pointer; |
| 500 | |
| 501 | if (!output || output->type != ACPI_TYPE_PACKAGE |
| 502 | || !output->package.count |
| 503 | || output->package.elements[0].type != ACPI_TYPE_BUFFER |
Feng Tang | 8ede06a | 2012-08-21 09:56:58 +0800 | [diff] [blame] | 504 | || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { |
Matthew Garrett | 38ac0f1 | 2012-05-11 16:08:26 +0800 | [diff] [blame] | 505 | status = AE_TYPE; |
| 506 | goto out; |
| 507 | } |
| 508 | |
Feng Tang | 8ede06a | 2012-08-21 09:56:58 +0800 | [diff] [blame] | 509 | status = acpi_decode_pld_buffer( |
| 510 | output->package.elements[0].buffer.pointer, |
| 511 | output->package.elements[0].buffer.length, |
| 512 | pld); |
| 513 | |
Matthew Garrett | 38ac0f1 | 2012-05-11 16:08:26 +0800 | [diff] [blame] | 514 | out: |
| 515 | kfree(buffer.pointer); |
| 516 | return status; |
| 517 | } |
| 518 | EXPORT_SYMBOL(acpi_get_physical_device_location); |
Toshi Kani | 275c58d | 2012-05-23 20:25:19 -0600 | [diff] [blame] | 519 | |
| 520 | /** |
Rafael J. Wysocki | 700b842 | 2014-02-21 01:07:17 +0100 | [diff] [blame] | 521 | * acpi_evaluate_ost: Evaluate _OST for hotplug operations |
Toshi Kani | 275c58d | 2012-05-23 20:25:19 -0600 | [diff] [blame] | 522 | * @handle: ACPI device handle |
| 523 | * @source_event: source event code |
| 524 | * @status_code: status code |
| 525 | * @status_buf: optional detailed information (NULL if none) |
| 526 | * |
| 527 | * Evaluate _OST for hotplug operations. All ACPI hotplug handlers |
| 528 | * must call this function when evaluating _OST for hotplug operations. |
| 529 | * When the platform does not support _OST, this function has no effect. |
| 530 | */ |
| 531 | acpi_status |
Jiang Liu | 05730c1 | 2014-02-19 14:02:15 +0800 | [diff] [blame] | 532 | acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, |
| 533 | struct acpi_buffer *status_buf) |
Toshi Kani | 275c58d | 2012-05-23 20:25:19 -0600 | [diff] [blame] | 534 | { |
Toshi Kani | 275c58d | 2012-05-23 20:25:19 -0600 | [diff] [blame] | 535 | union acpi_object params[3] = { |
| 536 | {.type = ACPI_TYPE_INTEGER,}, |
| 537 | {.type = ACPI_TYPE_INTEGER,}, |
| 538 | {.type = ACPI_TYPE_BUFFER,} |
| 539 | }; |
| 540 | struct acpi_object_list arg_list = {3, params}; |
Toshi Kani | 275c58d | 2012-05-23 20:25:19 -0600 | [diff] [blame] | 541 | |
| 542 | params[0].integer.value = source_event; |
| 543 | params[1].integer.value = status_code; |
| 544 | if (status_buf != NULL) { |
| 545 | params[2].buffer.pointer = status_buf->pointer; |
| 546 | params[2].buffer.length = status_buf->length; |
| 547 | } else { |
| 548 | params[2].buffer.pointer = NULL; |
| 549 | params[2].buffer.length = 0; |
| 550 | } |
| 551 | |
Jiang Liu | 05730c1 | 2014-02-19 14:02:15 +0800 | [diff] [blame] | 552 | return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); |
Toshi Kani | 275c58d | 2012-05-23 20:25:19 -0600 | [diff] [blame] | 553 | } |
Jiang Liu | 05730c1 | 2014-02-19 14:02:15 +0800 | [diff] [blame] | 554 | EXPORT_SYMBOL(acpi_evaluate_ost); |
Toshi Kani | fbfddae | 2012-11-21 01:36:28 +0000 | [diff] [blame] | 555 | |
| 556 | /** |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 557 | * acpi_handle_path: Return the object path of handle |
Andy Shevchenko | 8373f8c | 2019-10-01 17:27:20 +0300 | [diff] [blame] | 558 | * @handle: ACPI device handle |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 559 | * |
| 560 | * Caller must free the returned buffer |
| 561 | */ |
Sakari Ailus | 1269b6d | 2024-02-13 15:46:05 +0200 | [diff] [blame] | 562 | char *acpi_handle_path(acpi_handle handle) |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 563 | { |
| 564 | struct acpi_buffer buffer = { |
| 565 | .length = ACPI_ALLOCATE_BUFFER, |
| 566 | .pointer = NULL |
| 567 | }; |
| 568 | |
| 569 | if (in_interrupt() || |
| 570 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) |
| 571 | return NULL; |
| 572 | return buffer.pointer; |
| 573 | } |
| 574 | |
| 575 | /** |
Toshi Kani | fbfddae | 2012-11-21 01:36:28 +0000 | [diff] [blame] | 576 | * acpi_handle_printk: Print message with ACPI prefix and object path |
Andy Shevchenko | 8373f8c | 2019-10-01 17:27:20 +0300 | [diff] [blame] | 577 | * @level: log level |
| 578 | * @handle: ACPI device handle |
| 579 | * @fmt: format string |
Toshi Kani | fbfddae | 2012-11-21 01:36:28 +0000 | [diff] [blame] | 580 | * |
| 581 | * This function is called through acpi_handle_<level> macros and prints |
| 582 | * a message with ACPI prefix and object path. This function acquires |
| 583 | * the global namespace mutex to obtain an object path. In interrupt |
| 584 | * context, it shows the object path as <n/a>. |
| 585 | */ |
| 586 | void |
| 587 | acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...) |
| 588 | { |
| 589 | struct va_format vaf; |
| 590 | va_list args; |
Toshi Kani | fbfddae | 2012-11-21 01:36:28 +0000 | [diff] [blame] | 591 | const char *path; |
| 592 | |
| 593 | va_start(args, fmt); |
| 594 | vaf.fmt = fmt; |
| 595 | vaf.va = &args; |
| 596 | |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 597 | path = acpi_handle_path(handle); |
Jonathan Bergh | 6c766f7 | 2023-09-28 23:48:07 +0200 | [diff] [blame] | 598 | printk("%sACPI: %s: %pV", level, path ? path : "<n/a>", &vaf); |
Toshi Kani | fbfddae | 2012-11-21 01:36:28 +0000 | [diff] [blame] | 599 | |
| 600 | va_end(args); |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 601 | kfree(path); |
Toshi Kani | fbfddae | 2012-11-21 01:36:28 +0000 | [diff] [blame] | 602 | } |
| 603 | EXPORT_SYMBOL(acpi_handle_printk); |
Jiang Liu | 952c63e | 2013-06-29 00:24:38 +0800 | [diff] [blame] | 604 | |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 605 | #if defined(CONFIG_DYNAMIC_DEBUG) |
| 606 | /** |
| 607 | * __acpi_handle_debug: pr_debug with ACPI prefix and object path |
Andy Shevchenko | 8373f8c | 2019-10-01 17:27:20 +0300 | [diff] [blame] | 608 | * @descriptor: Dynamic Debug descriptor |
| 609 | * @handle: ACPI device handle |
| 610 | * @fmt: format string |
Bjørn Mork | 45fef5b | 2014-05-22 12:47:47 +0200 | [diff] [blame] | 611 | * |
| 612 | * This function is called through acpi_handle_debug macro and debug |
| 613 | * prints a message with ACPI prefix and object path. This function |
| 614 | * acquires the global namespace mutex to obtain an object path. In |
| 615 | * interrupt context, it shows the object path as <n/a>. |
| 616 | */ |
| 617 | void |
| 618 | __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, |
| 619 | const char *fmt, ...) |
| 620 | { |
| 621 | struct va_format vaf; |
| 622 | va_list args; |
| 623 | const char *path; |
| 624 | |
| 625 | va_start(args, fmt); |
| 626 | vaf.fmt = fmt; |
| 627 | vaf.va = &args; |
| 628 | |
| 629 | path = acpi_handle_path(handle); |
| 630 | __dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf); |
| 631 | |
| 632 | va_end(args); |
| 633 | kfree(path); |
| 634 | } |
| 635 | EXPORT_SYMBOL(__acpi_handle_debug); |
| 636 | #endif |
| 637 | |
Jiang Liu | 952c63e | 2013-06-29 00:24:38 +0800 | [diff] [blame] | 638 | /** |
Rafael J. Wysocki | 4c32454 | 2021-03-05 19:41:44 +0100 | [diff] [blame] | 639 | * acpi_evaluation_failure_warn - Log evaluation failure warning. |
| 640 | * @handle: Parent object handle. |
| 641 | * @name: Name of the object whose evaluation has failed. |
| 642 | * @status: Status value returned by the failing object evaluation. |
| 643 | */ |
| 644 | void acpi_evaluation_failure_warn(acpi_handle handle, const char *name, |
| 645 | acpi_status status) |
| 646 | { |
| 647 | acpi_handle_warn(handle, "%s evaluation failed: %s\n", name, |
| 648 | acpi_format_exception(status)); |
| 649 | } |
| 650 | EXPORT_SYMBOL_GPL(acpi_evaluation_failure_warn); |
| 651 | |
| 652 | /** |
Jiang Liu | 952c63e | 2013-06-29 00:24:38 +0800 | [diff] [blame] | 653 | * acpi_has_method: Check whether @handle has a method named @name |
| 654 | * @handle: ACPI device handle |
| 655 | * @name: name of object or method |
| 656 | * |
| 657 | * Check whether @handle has a method named @name. |
| 658 | */ |
| 659 | bool acpi_has_method(acpi_handle handle, char *name) |
| 660 | { |
| 661 | acpi_handle tmp; |
| 662 | |
| 663 | return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp)); |
| 664 | } |
| 665 | EXPORT_SYMBOL(acpi_has_method); |
Jiang Liu | 0db9820 | 2013-06-29 00:24:39 +0800 | [diff] [blame] | 666 | |
| 667 | acpi_status acpi_execute_simple_method(acpi_handle handle, char *method, |
| 668 | u64 arg) |
| 669 | { |
| 670 | union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; |
| 671 | struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, }; |
| 672 | |
| 673 | obj.integer.value = arg; |
| 674 | |
| 675 | return acpi_evaluate_object(handle, method, &arg_list, NULL); |
| 676 | } |
| 677 | EXPORT_SYMBOL(acpi_execute_simple_method); |
Jiang Liu | 7d2421f | 2013-06-29 00:24:40 +0800 | [diff] [blame] | 678 | |
| 679 | /** |
| 680 | * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations |
| 681 | * @handle: ACPI device handle |
| 682 | * |
| 683 | * Evaluate device's _EJ0 method for hotplug operations. |
| 684 | */ |
| 685 | acpi_status acpi_evaluate_ej0(acpi_handle handle) |
| 686 | { |
| 687 | acpi_status status; |
| 688 | |
| 689 | status = acpi_execute_simple_method(handle, "_EJ0", 1); |
| 690 | if (status == AE_NOT_FOUND) |
| 691 | acpi_handle_warn(handle, "No _EJ0 support for device\n"); |
| 692 | else if (ACPI_FAILURE(status)) |
| 693 | acpi_handle_warn(handle, "Eject failed (0x%x)\n", status); |
| 694 | |
| 695 | return status; |
| 696 | } |
| 697 | |
| 698 | /** |
| 699 | * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device |
| 700 | * @handle: ACPI device handle |
| 701 | * @lock: lock device if non-zero, otherwise unlock device |
| 702 | * |
| 703 | * Evaluate device's _LCK method if present to lock/unlock device |
| 704 | */ |
| 705 | acpi_status acpi_evaluate_lck(acpi_handle handle, int lock) |
| 706 | { |
| 707 | acpi_status status; |
| 708 | |
| 709 | status = acpi_execute_simple_method(handle, "_LCK", !!lock); |
| 710 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| 711 | if (lock) |
| 712 | acpi_handle_warn(handle, |
| 713 | "Locking device failed (0x%x)\n", status); |
| 714 | else |
| 715 | acpi_handle_warn(handle, |
| 716 | "Unlocking device failed (0x%x)\n", status); |
| 717 | } |
| 718 | |
| 719 | return status; |
| 720 | } |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 721 | |
| 722 | /** |
Hans de Goede | 132565d | 2020-05-07 12:49:16 +0200 | [diff] [blame] | 723 | * acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence |
| 724 | * @handle: ACPI device handle |
| 725 | * @space_id: ACPI address space id to register OpRegion presence for |
| 726 | * @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or |
| 727 | * ACPI_REG_DISCONNECT |
| 728 | * |
| 729 | * Evaluate device's _REG method to register OpRegion presence. |
| 730 | */ |
| 731 | acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function) |
| 732 | { |
| 733 | struct acpi_object_list arg_list; |
| 734 | union acpi_object params[2]; |
| 735 | |
| 736 | params[0].type = ACPI_TYPE_INTEGER; |
| 737 | params[0].integer.value = space_id; |
| 738 | params[1].type = ACPI_TYPE_INTEGER; |
| 739 | params[1].integer.value = function; |
| 740 | arg_list.count = 2; |
| 741 | arg_list.pointer = params; |
| 742 | |
| 743 | return acpi_evaluate_object(handle, "_REG", &arg_list, NULL); |
| 744 | } |
| 745 | EXPORT_SYMBOL(acpi_evaluate_reg); |
| 746 | |
| 747 | /** |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 748 | * acpi_evaluate_dsm - evaluate device's _DSM method |
| 749 | * @handle: ACPI device handle |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 750 | * @guid: GUID of requested functions, should be 16 bytes |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 751 | * @rev: revision number of requested function |
| 752 | * @func: requested function number |
| 753 | * @argv4: the function specific parameter |
| 754 | * |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 755 | * Evaluate device's _DSM method with specified GUID, revision id and |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 756 | * function number. Caller needs to free the returned object. |
| 757 | * |
| 758 | * Though ACPI defines the fourth parameter for _DSM should be a package, |
| 759 | * some old BIOSes do expect a buffer or an integer etc. |
| 760 | */ |
| 761 | union acpi_object * |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 762 | acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 func, |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 763 | union acpi_object *argv4) |
| 764 | { |
| 765 | acpi_status ret; |
| 766 | struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; |
| 767 | union acpi_object params[4]; |
| 768 | struct acpi_object_list input = { |
| 769 | .count = 4, |
| 770 | .pointer = params, |
| 771 | }; |
| 772 | |
| 773 | params[0].type = ACPI_TYPE_BUFFER; |
| 774 | params[0].buffer.length = 16; |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 775 | params[0].buffer.pointer = (u8 *)guid; |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 776 | params[1].type = ACPI_TYPE_INTEGER; |
| 777 | params[1].integer.value = rev; |
| 778 | params[2].type = ACPI_TYPE_INTEGER; |
| 779 | params[2].integer.value = func; |
| 780 | if (argv4) { |
| 781 | params[3] = *argv4; |
| 782 | } else { |
| 783 | params[3].type = ACPI_TYPE_PACKAGE; |
| 784 | params[3].package.count = 0; |
| 785 | params[3].package.elements = NULL; |
| 786 | } |
| 787 | |
| 788 | ret = acpi_evaluate_object(handle, "_DSM", &input, &buf); |
| 789 | if (ACPI_SUCCESS(ret)) |
| 790 | return (union acpi_object *)buf.pointer; |
| 791 | |
| 792 | if (ret != AE_NOT_FOUND) |
| 793 | acpi_handle_warn(handle, |
Michael Niewöhner | 06eb8dc | 2022-05-17 20:40:06 +0200 | [diff] [blame] | 794 | "failed to evaluate _DSM %pUb (0x%x)\n", guid, ret); |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 795 | |
| 796 | return NULL; |
| 797 | } |
| 798 | EXPORT_SYMBOL(acpi_evaluate_dsm); |
| 799 | |
| 800 | /** |
| 801 | * acpi_check_dsm - check if _DSM method supports requested functions. |
| 802 | * @handle: ACPI device handle |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 803 | * @guid: GUID of requested functions, should be 16 bytes at least |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 804 | * @rev: revision number of requested functions |
| 805 | * @funcs: bitmap of requested functions |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 806 | * |
| 807 | * Evaluate device's _DSM method to check whether it supports requested |
| 808 | * functions. Currently only support 64 functions at maximum, should be |
| 809 | * enough for now. |
| 810 | */ |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 811 | bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs) |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 812 | { |
| 813 | int i; |
| 814 | u64 mask = 0; |
| 815 | union acpi_object *obj; |
| 816 | |
Dan Williams | a722559 | 2016-07-19 12:32:39 -0700 | [diff] [blame] | 817 | if (funcs == 0) |
| 818 | return false; |
| 819 | |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 820 | obj = acpi_evaluate_dsm(handle, guid, rev, 0, NULL); |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 821 | if (!obj) |
| 822 | return false; |
| 823 | |
| 824 | /* For compatibility, old BIOSes may return an integer */ |
| 825 | if (obj->type == ACPI_TYPE_INTEGER) |
| 826 | mask = obj->integer.value; |
| 827 | else if (obj->type == ACPI_TYPE_BUFFER) |
| 828 | for (i = 0; i < obj->buffer.length && i < 8; i++) |
Colin Ian King | 4a798f5 | 2016-03-18 15:08:01 +0000 | [diff] [blame] | 829 | mask |= (((u64)obj->buffer.pointer[i]) << (i * 8)); |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 830 | ACPI_FREE(obj); |
| 831 | |
| 832 | /* |
| 833 | * Bit 0 indicates whether there's support for any functions other than |
Andy Shevchenko | 94116f8 | 2017-06-05 19:40:46 +0300 | [diff] [blame] | 834 | * function 0 for the specified GUID and revision. |
Jiang Liu | a65ac52 | 2013-12-19 20:38:10 +0800 | [diff] [blame] | 835 | */ |
| 836 | if ((mask & 0x1) && (mask & funcs) == funcs) |
| 837 | return true; |
| 838 | |
| 839 | return false; |
| 840 | } |
| 841 | EXPORT_SYMBOL(acpi_check_dsm); |
Hans de Goede | 14ca7a47 | 2015-06-16 16:27:47 +0200 | [diff] [blame] | 842 | |
Lukas Wunner | 2d12b6b | 2015-11-25 21:19:55 +0100 | [diff] [blame] | 843 | /** |
Andy Shevchenko | 5db72fd | 2022-09-13 19:31:40 +0300 | [diff] [blame] | 844 | * acpi_dev_uid_to_integer - treat ACPI device _UID as integer |
| 845 | * @adev: ACPI device to get _UID from |
| 846 | * @integer: output buffer for integer |
| 847 | * |
| 848 | * Considers _UID as integer and converts it to @integer. |
| 849 | * |
| 850 | * Returns 0 on success, or negative error code otherwise. |
| 851 | */ |
| 852 | int acpi_dev_uid_to_integer(struct acpi_device *adev, u64 *integer) |
| 853 | { |
| 854 | const char *uid; |
| 855 | |
| 856 | if (!adev) |
| 857 | return -ENODEV; |
| 858 | |
| 859 | uid = acpi_device_uid(adev); |
| 860 | if (!uid) |
| 861 | return -ENODATA; |
| 862 | |
| 863 | return kstrtou64(uid, 0, integer); |
| 864 | } |
| 865 | EXPORT_SYMBOL(acpi_dev_uid_to_integer); |
| 866 | |
| 867 | /** |
Lukas Wunner | c68ae33e | 2016-03-24 13:15:20 +0100 | [diff] [blame] | 868 | * acpi_dev_found - Detect presence of a given ACPI device in the namespace. |
Lukas Wunner | 2d12b6b | 2015-11-25 21:19:55 +0100 | [diff] [blame] | 869 | * @hid: Hardware ID of the device. |
| 870 | * |
| 871 | * Return %true if the device was present at the moment of invocation. |
| 872 | * Note that if the device is pluggable, it may since have disappeared. |
| 873 | * |
| 874 | * For this function to work, acpi_bus_scan() must have been executed |
| 875 | * which happens in the subsys_initcall() subsection. Hence, do not |
| 876 | * call from a subsys_initcall() or earlier (use acpi_get_devices() |
| 877 | * instead). Calling from module_init() is fine (which is synonymous |
| 878 | * with device_initcall()). |
| 879 | */ |
Lukas Wunner | c68ae33e | 2016-03-24 13:15:20 +0100 | [diff] [blame] | 880 | bool acpi_dev_found(const char *hid) |
Lukas Wunner | 2d12b6b | 2015-11-25 21:19:55 +0100 | [diff] [blame] | 881 | { |
| 882 | struct acpi_device_bus_id *acpi_device_bus_id; |
| 883 | bool found = false; |
| 884 | |
| 885 | mutex_lock(&acpi_device_lock); |
| 886 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) |
| 887 | if (!strcmp(acpi_device_bus_id->bus_id, hid)) { |
| 888 | found = true; |
| 889 | break; |
| 890 | } |
| 891 | mutex_unlock(&acpi_device_lock); |
| 892 | |
| 893 | return found; |
| 894 | } |
Lukas Wunner | c68ae33e | 2016-03-24 13:15:20 +0100 | [diff] [blame] | 895 | EXPORT_SYMBOL(acpi_dev_found); |
Lukas Wunner | 2d12b6b | 2015-11-25 21:19:55 +0100 | [diff] [blame] | 896 | |
Andy Shevchenko | 67dcf8a | 2018-01-05 18:09:33 +0200 | [diff] [blame] | 897 | struct acpi_dev_match_info { |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 898 | struct acpi_device_id hid[2]; |
| 899 | const char *uid; |
| 900 | s64 hrv; |
| 901 | }; |
| 902 | |
Suzuki K Poulose | 418e3ea | 2019-06-14 18:53:59 +0100 | [diff] [blame] | 903 | static int acpi_dev_match_cb(struct device *dev, const void *data) |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 904 | { |
| 905 | struct acpi_device *adev = to_acpi_device(dev); |
Suzuki K Poulose | 418e3ea | 2019-06-14 18:53:59 +0100 | [diff] [blame] | 906 | const struct acpi_dev_match_info *match = data; |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 907 | unsigned long long hrv; |
| 908 | acpi_status status; |
| 909 | |
| 910 | if (acpi_match_device_ids(adev, match->hid)) |
| 911 | return 0; |
| 912 | |
Raag Jadav | 3a3cc54 | 2023-10-24 11:50:15 +0530 | [diff] [blame] | 913 | if (match->uid && !acpi_dev_uid_match(adev, match->uid)) |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 914 | return 0; |
| 915 | |
| 916 | if (match->hrv == -1) |
| 917 | return 1; |
| 918 | |
| 919 | status = acpi_evaluate_integer(adev->handle, "_HRV", NULL, &hrv); |
| 920 | if (ACPI_FAILURE(status)) |
| 921 | return 0; |
| 922 | |
| 923 | return hrv == match->hrv; |
| 924 | } |
| 925 | |
| 926 | /** |
| 927 | * acpi_dev_present - Detect that a given ACPI device is present |
| 928 | * @hid: Hardware ID of the device. |
| 929 | * @uid: Unique ID of the device, pass NULL to not check _UID |
| 930 | * @hrv: Hardware Revision of the device, pass -1 to not check _HRV |
| 931 | * |
| 932 | * Return %true if a matching device was present at the moment of invocation. |
| 933 | * Note that if the device is pluggable, it may since have disappeared. |
| 934 | * |
| 935 | * Note that unlike acpi_dev_found() this function checks the status |
Andy Shevchenko | e7b07d3 | 2021-04-13 02:20:52 +0300 | [diff] [blame] | 936 | * of the device. So for devices which are present in the DSDT, but |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 937 | * which are disabled (their _STA callback returns 0) this function |
| 938 | * will return false. |
| 939 | * |
| 940 | * For this function to work, acpi_bus_scan() must have been executed |
| 941 | * which happens in the subsys_initcall() subsection. Hence, do not |
| 942 | * call from a subsys_initcall() or earlier (use acpi_get_devices() |
| 943 | * instead). Calling from module_init() is fine (which is synonymous |
| 944 | * with device_initcall()). |
| 945 | */ |
| 946 | bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) |
| 947 | { |
Andy Shevchenko | 67dcf8a | 2018-01-05 18:09:33 +0200 | [diff] [blame] | 948 | struct acpi_dev_match_info match = {}; |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 949 | struct device *dev; |
| 950 | |
Wolfram Sang | b75d2cd | 2022-08-18 22:59:55 +0200 | [diff] [blame] | 951 | strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 952 | match.uid = uid; |
| 953 | match.hrv = hrv; |
| 954 | |
Andy Shevchenko | 67dcf8a | 2018-01-05 18:09:33 +0200 | [diff] [blame] | 955 | dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); |
Andy Shevchenko | 54e3aca | 2019-03-18 21:47:09 +0300 | [diff] [blame] | 956 | put_device(dev); |
Hans de Goede | 8661423 | 2017-04-19 14:02:08 +0200 | [diff] [blame] | 957 | return !!dev; |
| 958 | } |
| 959 | EXPORT_SYMBOL(acpi_dev_present); |
| 960 | |
Andy Shevchenko | 67dcf8a | 2018-01-05 18:09:33 +0200 | [diff] [blame] | 961 | /** |
Daniel Scally | bf263f6 | 2021-01-07 14:28:36 +0100 | [diff] [blame] | 962 | * acpi_dev_get_next_match_dev - Return the next match of ACPI device |
Andy Shevchenko | e7b07d3 | 2021-04-13 02:20:52 +0300 | [diff] [blame] | 963 | * @adev: Pointer to the previous ACPI device matching this @hid, @uid and @hrv |
Daniel Scally | bf263f6 | 2021-01-07 14:28:36 +0100 | [diff] [blame] | 964 | * @hid: Hardware ID of the device. |
| 965 | * @uid: Unique ID of the device, pass NULL to not check _UID |
| 966 | * @hrv: Hardware Revision of the device, pass -1 to not check _HRV |
| 967 | * |
| 968 | * Return the next match of ACPI device if another matching device was present |
| 969 | * at the moment of invocation, or NULL otherwise. |
| 970 | * |
Andy Shevchenko | 81eeb2f5 | 2021-04-13 02:20:51 +0300 | [diff] [blame] | 971 | * The caller is responsible for invoking acpi_dev_put() on the returned device. |
Andy Shevchenko | 71f6428 | 2021-07-12 21:21:21 +0300 | [diff] [blame] | 972 | * On the other hand the function invokes acpi_dev_put() on the given @adev |
| 973 | * assuming that its reference counter had been increased beforehand. |
Daniel Scally | bf263f6 | 2021-01-07 14:28:36 +0100 | [diff] [blame] | 974 | * |
| 975 | * See additional information in acpi_dev_present() as well. |
| 976 | */ |
| 977 | struct acpi_device * |
| 978 | acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv) |
| 979 | { |
| 980 | struct device *start = adev ? &adev->dev : NULL; |
| 981 | struct acpi_dev_match_info match = {}; |
| 982 | struct device *dev; |
| 983 | |
Wolfram Sang | b75d2cd | 2022-08-18 22:59:55 +0200 | [diff] [blame] | 984 | strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); |
Daniel Scally | bf263f6 | 2021-01-07 14:28:36 +0100 | [diff] [blame] | 985 | match.uid = uid; |
| 986 | match.hrv = hrv; |
| 987 | |
| 988 | dev = bus_find_device(&acpi_bus_type, start, &match, acpi_dev_match_cb); |
Andy Shevchenko | 71f6428 | 2021-07-12 21:21:21 +0300 | [diff] [blame] | 989 | acpi_dev_put(adev); |
Daniel Scally | bf263f6 | 2021-01-07 14:28:36 +0100 | [diff] [blame] | 990 | return dev ? to_acpi_device(dev) : NULL; |
| 991 | } |
| 992 | EXPORT_SYMBOL(acpi_dev_get_next_match_dev); |
| 993 | |
| 994 | /** |
Andy Shevchenko | 817b4d6 | 2019-03-18 23:00:54 +0300 | [diff] [blame] | 995 | * acpi_dev_get_first_match_dev - Return the first match of ACPI device |
Andy Shevchenko | 67dcf8a | 2018-01-05 18:09:33 +0200 | [diff] [blame] | 996 | * @hid: Hardware ID of the device. |
| 997 | * @uid: Unique ID of the device, pass NULL to not check _UID |
| 998 | * @hrv: Hardware Revision of the device, pass -1 to not check _HRV |
| 999 | * |
Andy Shevchenko | 817b4d6 | 2019-03-18 23:00:54 +0300 | [diff] [blame] | 1000 | * Return the first match of ACPI device if a matching device was present |
Andy Shevchenko | 67dcf8a | 2018-01-05 18:09:33 +0200 | [diff] [blame] | 1001 | * at the moment of invocation, or NULL otherwise. |
| 1002 | * |
Andy Shevchenko | 81eeb2f5 | 2021-04-13 02:20:51 +0300 | [diff] [blame] | 1003 | * The caller is responsible for invoking acpi_dev_put() on the returned device. |
Andy Shevchenko | 817b4d6 | 2019-03-18 23:00:54 +0300 | [diff] [blame] | 1004 | * |
Andy Shevchenko | 67dcf8a | 2018-01-05 18:09:33 +0200 | [diff] [blame] | 1005 | * See additional information in acpi_dev_present() as well. |
| 1006 | */ |
Andy Shevchenko | 817b4d6 | 2019-03-18 23:00:54 +0300 | [diff] [blame] | 1007 | struct acpi_device * |
| 1008 | acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) |
| 1009 | { |
Daniel Scally | bf263f6 | 2021-01-07 14:28:36 +0100 | [diff] [blame] | 1010 | return acpi_dev_get_next_match_dev(NULL, hid, uid, hrv); |
Andy Shevchenko | 817b4d6 | 2019-03-18 23:00:54 +0300 | [diff] [blame] | 1011 | } |
| 1012 | EXPORT_SYMBOL(acpi_dev_get_first_match_dev); |
| 1013 | |
Hans de Goede | 8eb99e9 | 2021-04-07 19:58:20 +0200 | [diff] [blame] | 1014 | /** |
| 1015 | * acpi_reduced_hardware - Return if this is an ACPI-reduced-hw machine |
| 1016 | * |
| 1017 | * Return true when running on an ACPI-reduced-hw machine, false otherwise. |
| 1018 | */ |
| 1019 | bool acpi_reduced_hardware(void) |
| 1020 | { |
| 1021 | return acpi_gbl_reduced_hardware; |
| 1022 | } |
| 1023 | EXPORT_SYMBOL_GPL(acpi_reduced_hardware); |
| 1024 | |
Hans de Goede | 14ca7a47 | 2015-06-16 16:27:47 +0200 | [diff] [blame] | 1025 | /* |
| 1026 | * acpi_backlight= handling, this is done here rather then in video_detect.c |
| 1027 | * because __setup cannot be used in modules. |
| 1028 | */ |
| 1029 | char acpi_video_backlight_string[16]; |
| 1030 | EXPORT_SYMBOL(acpi_video_backlight_string); |
| 1031 | |
| 1032 | static int __init acpi_backlight(char *str) |
| 1033 | { |
Wolfram Sang | b75d2cd | 2022-08-18 22:59:55 +0200 | [diff] [blame] | 1034 | strscpy(acpi_video_backlight_string, str, |
Hans de Goede | 14ca7a47 | 2015-06-16 16:27:47 +0200 | [diff] [blame] | 1035 | sizeof(acpi_video_backlight_string)); |
| 1036 | return 1; |
| 1037 | } |
| 1038 | __setup("acpi_backlight=", acpi_backlight); |
Toshi Kani | 5aa5911 | 2017-08-23 16:54:43 -0600 | [diff] [blame] | 1039 | |
| 1040 | /** |
| 1041 | * acpi_match_platform_list - Check if the system matches with a given list |
| 1042 | * @plat: pointer to acpi_platform_list table terminated by a NULL entry |
| 1043 | * |
| 1044 | * Return the matched index if the system is found in the platform list. |
| 1045 | * Otherwise, return a negative error code. |
| 1046 | */ |
| 1047 | int acpi_match_platform_list(const struct acpi_platform_list *plat) |
| 1048 | { |
| 1049 | struct acpi_table_header hdr; |
| 1050 | int idx = 0; |
| 1051 | |
| 1052 | if (acpi_disabled) |
| 1053 | return -ENODEV; |
| 1054 | |
| 1055 | for (; plat->oem_id[0]; plat++, idx++) { |
| 1056 | if (ACPI_FAILURE(acpi_get_table_header(plat->table, 0, &hdr))) |
| 1057 | continue; |
| 1058 | |
| 1059 | if (strncmp(plat->oem_id, hdr.oem_id, ACPI_OEM_ID_SIZE)) |
| 1060 | continue; |
| 1061 | |
| 1062 | if (strncmp(plat->oem_table_id, hdr.oem_table_id, ACPI_OEM_TABLE_ID_SIZE)) |
| 1063 | continue; |
| 1064 | |
| 1065 | if ((plat->pred == all_versions) || |
| 1066 | (plat->pred == less_than_or_equal && hdr.oem_revision <= plat->oem_revision) || |
| 1067 | (plat->pred == greater_than_or_equal && hdr.oem_revision >= plat->oem_revision) || |
| 1068 | (plat->pred == equal && hdr.oem_revision == plat->oem_revision)) |
| 1069 | return idx; |
| 1070 | } |
| 1071 | |
| 1072 | return -ENODEV; |
| 1073 | } |
| 1074 | EXPORT_SYMBOL(acpi_match_platform_list); |