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924 lines
24 KiB
924 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) |
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* |
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* Copyright (C) 2001, 2002 Andy Grover <[email protected]> |
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) "ACPI: utils: " fmt |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/hardirq.h> |
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#include <linux/acpi.h> |
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#include <linux/dynamic_debug.h> |
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#include "internal.h" |
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#include "sleep.h" |
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|
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/* -------------------------------------------------------------------------- |
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Object Evaluation Helpers |
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-------------------------------------------------------------------------- */ |
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static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) |
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{ |
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acpi_handle_debug(h, "Evaluate [%s]: %s\n", p, acpi_format_exception(s)); |
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} |
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acpi_status |
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acpi_extract_package(union acpi_object *package, |
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struct acpi_buffer *format, struct acpi_buffer *buffer) |
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{ |
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u32 size_required = 0; |
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u32 tail_offset = 0; |
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char *format_string = NULL; |
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u32 format_count = 0; |
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u32 i = 0; |
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u8 *head = NULL; |
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u8 *tail = NULL; |
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if (!package || (package->type != ACPI_TYPE_PACKAGE) |
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|| (package->package.count < 1)) { |
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pr_debug("Invalid package argument\n"); |
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return AE_BAD_PARAMETER; |
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} |
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if (!format || !format->pointer || (format->length < 1)) { |
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pr_debug("Invalid format argument\n"); |
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return AE_BAD_PARAMETER; |
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} |
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if (!buffer) { |
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pr_debug("Invalid buffer argument\n"); |
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return AE_BAD_PARAMETER; |
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} |
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format_count = (format->length / sizeof(char)) - 1; |
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if (format_count > package->package.count) { |
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pr_debug("Format specifies more objects [%d] than present [%d]\n", |
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format_count, package->package.count); |
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return AE_BAD_DATA; |
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} |
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format_string = format->pointer; |
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/* |
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* Calculate size_required. |
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*/ |
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for (i = 0; i < format_count; i++) { |
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union acpi_object *element = &(package->package.elements[i]); |
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switch (element->type) { |
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case ACPI_TYPE_INTEGER: |
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switch (format_string[i]) { |
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case 'N': |
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size_required += sizeof(u64); |
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tail_offset += sizeof(u64); |
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break; |
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case 'S': |
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size_required += |
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sizeof(char *) + sizeof(u64) + |
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sizeof(char); |
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tail_offset += sizeof(char *); |
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break; |
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default: |
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pr_debug("Invalid package element [%d]: got number, expected [%c]\n", |
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i, format_string[i]); |
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return AE_BAD_DATA; |
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} |
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break; |
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case ACPI_TYPE_STRING: |
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case ACPI_TYPE_BUFFER: |
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switch (format_string[i]) { |
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case 'S': |
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size_required += |
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sizeof(char *) + |
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(element->string.length * sizeof(char)) + |
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sizeof(char); |
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tail_offset += sizeof(char *); |
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break; |
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case 'B': |
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size_required += |
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sizeof(u8 *) + element->buffer.length; |
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tail_offset += sizeof(u8 *); |
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break; |
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default: |
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pr_debug("Invalid package element [%d] got string/buffer, expected [%c]\n", |
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i, format_string[i]); |
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return AE_BAD_DATA; |
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} |
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break; |
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case ACPI_TYPE_LOCAL_REFERENCE: |
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switch (format_string[i]) { |
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case 'R': |
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size_required += sizeof(void *); |
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tail_offset += sizeof(void *); |
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break; |
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default: |
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pr_debug("Invalid package element [%d] got reference, expected [%c]\n", |
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i, format_string[i]); |
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return AE_BAD_DATA; |
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} |
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break; |
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case ACPI_TYPE_PACKAGE: |
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default: |
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pr_debug("Unsupported element at index=%d\n", i); |
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/* TBD: handle nested packages... */ |
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return AE_SUPPORT; |
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} |
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} |
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/* |
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* Validate output buffer. |
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*/ |
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if (buffer->length == ACPI_ALLOCATE_BUFFER) { |
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buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); |
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if (!buffer->pointer) |
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return AE_NO_MEMORY; |
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buffer->length = size_required; |
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} else { |
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if (buffer->length < size_required) { |
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buffer->length = size_required; |
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return AE_BUFFER_OVERFLOW; |
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} else if (buffer->length != size_required || |
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!buffer->pointer) { |
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return AE_BAD_PARAMETER; |
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} |
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} |
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head = buffer->pointer; |
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tail = buffer->pointer + tail_offset; |
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/* |
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* Extract package data. |
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*/ |
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for (i = 0; i < format_count; i++) { |
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u8 **pointer = NULL; |
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union acpi_object *element = &(package->package.elements[i]); |
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switch (element->type) { |
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case ACPI_TYPE_INTEGER: |
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switch (format_string[i]) { |
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case 'N': |
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*((u64 *) head) = |
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element->integer.value; |
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head += sizeof(u64); |
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break; |
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case 'S': |
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pointer = (u8 **) head; |
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*pointer = tail; |
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*((u64 *) tail) = |
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element->integer.value; |
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head += sizeof(u64 *); |
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tail += sizeof(u64); |
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/* NULL terminate string */ |
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*tail = (char)0; |
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tail += sizeof(char); |
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break; |
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default: |
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/* Should never get here */ |
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break; |
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} |
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break; |
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case ACPI_TYPE_STRING: |
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case ACPI_TYPE_BUFFER: |
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switch (format_string[i]) { |
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case 'S': |
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pointer = (u8 **) head; |
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*pointer = tail; |
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memcpy(tail, element->string.pointer, |
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element->string.length); |
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head += sizeof(char *); |
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tail += element->string.length * sizeof(char); |
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/* NULL terminate string */ |
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*tail = (char)0; |
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tail += sizeof(char); |
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break; |
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case 'B': |
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pointer = (u8 **) head; |
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*pointer = tail; |
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memcpy(tail, element->buffer.pointer, |
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element->buffer.length); |
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head += sizeof(u8 *); |
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tail += element->buffer.length; |
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break; |
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default: |
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/* Should never get here */ |
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break; |
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} |
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break; |
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case ACPI_TYPE_LOCAL_REFERENCE: |
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switch (format_string[i]) { |
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case 'R': |
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*(void **)head = |
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(void *)element->reference.handle; |
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head += sizeof(void *); |
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break; |
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default: |
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/* Should never get here */ |
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break; |
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} |
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break; |
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case ACPI_TYPE_PACKAGE: |
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/* TBD: handle nested packages... */ |
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default: |
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/* Should never get here */ |
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break; |
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} |
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} |
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return AE_OK; |
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} |
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EXPORT_SYMBOL(acpi_extract_package); |
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acpi_status |
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acpi_evaluate_integer(acpi_handle handle, |
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acpi_string pathname, |
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struct acpi_object_list *arguments, unsigned long long *data) |
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{ |
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acpi_status status = AE_OK; |
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union acpi_object element; |
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struct acpi_buffer buffer = { 0, NULL }; |
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if (!data) |
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return AE_BAD_PARAMETER; |
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buffer.length = sizeof(union acpi_object); |
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buffer.pointer = &element; |
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status = acpi_evaluate_object(handle, pathname, arguments, &buffer); |
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if (ACPI_FAILURE(status)) { |
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acpi_util_eval_error(handle, pathname, status); |
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return status; |
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} |
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if (element.type != ACPI_TYPE_INTEGER) { |
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acpi_util_eval_error(handle, pathname, AE_BAD_DATA); |
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return AE_BAD_DATA; |
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} |
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*data = element.integer.value; |
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acpi_handle_debug(handle, "Return value [%llu]\n", *data); |
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return AE_OK; |
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} |
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EXPORT_SYMBOL(acpi_evaluate_integer); |
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acpi_status |
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acpi_evaluate_reference(acpi_handle handle, |
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acpi_string pathname, |
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struct acpi_object_list *arguments, |
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struct acpi_handle_list *list) |
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{ |
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acpi_status status = AE_OK; |
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union acpi_object *package = NULL; |
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union acpi_object *element = NULL; |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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u32 i = 0; |
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if (!list) { |
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return AE_BAD_PARAMETER; |
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} |
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/* Evaluate object. */ |
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status = acpi_evaluate_object(handle, pathname, arguments, &buffer); |
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if (ACPI_FAILURE(status)) |
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goto end; |
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package = buffer.pointer; |
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if ((buffer.length == 0) || !package) { |
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status = AE_BAD_DATA; |
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acpi_util_eval_error(handle, pathname, status); |
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goto end; |
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} |
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if (package->type != ACPI_TYPE_PACKAGE) { |
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status = AE_BAD_DATA; |
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acpi_util_eval_error(handle, pathname, status); |
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goto end; |
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} |
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if (!package->package.count) { |
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status = AE_BAD_DATA; |
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acpi_util_eval_error(handle, pathname, status); |
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goto end; |
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} |
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if (package->package.count > ACPI_MAX_HANDLES) { |
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kfree(package); |
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return AE_NO_MEMORY; |
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} |
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list->count = package->package.count; |
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/* Extract package data. */ |
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for (i = 0; i < list->count; i++) { |
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element = &(package->package.elements[i]); |
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if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { |
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status = AE_BAD_DATA; |
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acpi_util_eval_error(handle, pathname, status); |
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break; |
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} |
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if (!element->reference.handle) { |
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status = AE_NULL_ENTRY; |
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acpi_util_eval_error(handle, pathname, status); |
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break; |
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} |
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/* Get the acpi_handle. */ |
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list->handles[i] = element->reference.handle; |
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acpi_handle_debug(list->handles[i], "Found in reference list\n"); |
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} |
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end: |
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if (ACPI_FAILURE(status)) { |
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list->count = 0; |
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//kfree(list->handles); |
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} |
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kfree(buffer.pointer); |
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return status; |
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} |
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EXPORT_SYMBOL(acpi_evaluate_reference); |
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acpi_status |
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acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) |
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{ |
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acpi_status status; |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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union acpi_object *output; |
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status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); |
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if (ACPI_FAILURE(status)) |
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return status; |
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output = buffer.pointer; |
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if (!output || output->type != ACPI_TYPE_PACKAGE |
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|| !output->package.count |
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|| output->package.elements[0].type != ACPI_TYPE_BUFFER |
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|| output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { |
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status = AE_TYPE; |
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goto out; |
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} |
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status = acpi_decode_pld_buffer( |
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output->package.elements[0].buffer.pointer, |
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output->package.elements[0].buffer.length, |
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pld); |
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out: |
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kfree(buffer.pointer); |
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return status; |
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} |
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EXPORT_SYMBOL(acpi_get_physical_device_location); |
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/** |
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* acpi_evaluate_ost: Evaluate _OST for hotplug operations |
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* @handle: ACPI device handle |
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* @source_event: source event code |
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* @status_code: status code |
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* @status_buf: optional detailed information (NULL if none) |
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* |
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* Evaluate _OST for hotplug operations. All ACPI hotplug handlers |
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* must call this function when evaluating _OST for hotplug operations. |
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* When the platform does not support _OST, this function has no effect. |
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*/ |
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acpi_status |
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acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, |
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struct acpi_buffer *status_buf) |
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{ |
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union acpi_object params[3] = { |
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{.type = ACPI_TYPE_INTEGER,}, |
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{.type = ACPI_TYPE_INTEGER,}, |
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{.type = ACPI_TYPE_BUFFER,} |
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}; |
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struct acpi_object_list arg_list = {3, params}; |
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params[0].integer.value = source_event; |
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params[1].integer.value = status_code; |
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if (status_buf != NULL) { |
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params[2].buffer.pointer = status_buf->pointer; |
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params[2].buffer.length = status_buf->length; |
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} else { |
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params[2].buffer.pointer = NULL; |
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params[2].buffer.length = 0; |
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} |
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return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); |
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} |
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EXPORT_SYMBOL(acpi_evaluate_ost); |
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/** |
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* acpi_handle_path: Return the object path of handle |
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* @handle: ACPI device handle |
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* |
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* Caller must free the returned buffer |
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*/ |
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static char *acpi_handle_path(acpi_handle handle) |
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{ |
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struct acpi_buffer buffer = { |
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.length = ACPI_ALLOCATE_BUFFER, |
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.pointer = NULL |
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}; |
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if (in_interrupt() || |
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) |
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return NULL; |
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return buffer.pointer; |
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} |
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/** |
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* acpi_handle_printk: Print message with ACPI prefix and object path |
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* @level: log level |
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* @handle: ACPI device handle |
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* @fmt: format string |
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* |
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* This function is called through acpi_handle_<level> macros and prints |
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* a message with ACPI prefix and object path. This function acquires |
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* the global namespace mutex to obtain an object path. In interrupt |
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* context, it shows the object path as <n/a>. |
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*/ |
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void |
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acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...) |
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{ |
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struct va_format vaf; |
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va_list args; |
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const char *path; |
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va_start(args, fmt); |
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vaf.fmt = fmt; |
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vaf.va = &args; |
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path = acpi_handle_path(handle); |
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printk("%sACPI: %s: %pV", level, path ? path : "<n/a>" , &vaf); |
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va_end(args); |
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kfree(path); |
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} |
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EXPORT_SYMBOL(acpi_handle_printk); |
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#if defined(CONFIG_DYNAMIC_DEBUG) |
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/** |
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* __acpi_handle_debug: pr_debug with ACPI prefix and object path |
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* @descriptor: Dynamic Debug descriptor |
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* @handle: ACPI device handle |
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* @fmt: format string |
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* |
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* This function is called through acpi_handle_debug macro and debug |
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* prints a message with ACPI prefix and object path. This function |
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* acquires the global namespace mutex to obtain an object path. In |
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* interrupt context, it shows the object path as <n/a>. |
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*/ |
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void |
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__acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, |
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const char *fmt, ...) |
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{ |
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struct va_format vaf; |
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va_list args; |
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const char *path; |
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va_start(args, fmt); |
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vaf.fmt = fmt; |
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vaf.va = &args; |
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path = acpi_handle_path(handle); |
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__dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf); |
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va_end(args); |
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kfree(path); |
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} |
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EXPORT_SYMBOL(__acpi_handle_debug); |
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#endif |
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/** |
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* acpi_has_method: Check whether @handle has a method named @name |
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* @handle: ACPI device handle |
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* @name: name of object or method |
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* |
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* Check whether @handle has a method named @name. |
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*/ |
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bool acpi_has_method(acpi_handle handle, char *name) |
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{ |
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acpi_handle tmp; |
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return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp)); |
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} |
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EXPORT_SYMBOL(acpi_has_method); |
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acpi_status acpi_execute_simple_method(acpi_handle handle, char *method, |
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u64 arg) |
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{ |
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union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; |
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struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, }; |
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|
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obj.integer.value = arg; |
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return acpi_evaluate_object(handle, method, &arg_list, NULL); |
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} |
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EXPORT_SYMBOL(acpi_execute_simple_method); |
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|
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/** |
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* acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations |
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* @handle: ACPI device handle |
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* |
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* Evaluate device's _EJ0 method for hotplug operations. |
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*/ |
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acpi_status acpi_evaluate_ej0(acpi_handle handle) |
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{ |
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acpi_status status; |
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status = acpi_execute_simple_method(handle, "_EJ0", 1); |
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if (status == AE_NOT_FOUND) |
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acpi_handle_warn(handle, "No _EJ0 support for device\n"); |
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else if (ACPI_FAILURE(status)) |
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acpi_handle_warn(handle, "Eject failed (0x%x)\n", status); |
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return status; |
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} |
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|
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/** |
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* acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device |
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* @handle: ACPI device handle |
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* @lock: lock device if non-zero, otherwise unlock device |
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* |
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* Evaluate device's _LCK method if present to lock/unlock device |
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*/ |
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acpi_status acpi_evaluate_lck(acpi_handle handle, int lock) |
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{ |
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acpi_status status; |
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|
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status = acpi_execute_simple_method(handle, "_LCK", !!lock); |
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
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if (lock) |
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acpi_handle_warn(handle, |
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"Locking device failed (0x%x)\n", status); |
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else |
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acpi_handle_warn(handle, |
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"Unlocking device failed (0x%x)\n", status); |
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} |
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return status; |
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} |
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|
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/** |
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* acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence |
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* @handle: ACPI device handle |
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* @space_id: ACPI address space id to register OpRegion presence for |
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* @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or |
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* ACPI_REG_DISCONNECT |
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* |
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* Evaluate device's _REG method to register OpRegion presence. |
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*/ |
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acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function) |
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{ |
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struct acpi_object_list arg_list; |
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union acpi_object params[2]; |
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|
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params[0].type = ACPI_TYPE_INTEGER; |
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params[0].integer.value = space_id; |
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params[1].type = ACPI_TYPE_INTEGER; |
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params[1].integer.value = function; |
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arg_list.count = 2; |
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arg_list.pointer = params; |
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|
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return acpi_evaluate_object(handle, "_REG", &arg_list, NULL); |
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} |
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EXPORT_SYMBOL(acpi_evaluate_reg); |
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|
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/** |
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* acpi_evaluate_dsm - evaluate device's _DSM method |
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* @handle: ACPI device handle |
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* @guid: GUID of requested functions, should be 16 bytes |
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* @rev: revision number of requested function |
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* @func: requested function number |
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* @argv4: the function specific parameter |
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* |
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* Evaluate device's _DSM method with specified GUID, revision id and |
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* function number. Caller needs to free the returned object. |
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* |
|
* Though ACPI defines the fourth parameter for _DSM should be a package, |
|
* some old BIOSes do expect a buffer or an integer etc. |
|
*/ |
|
union acpi_object * |
|
acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 func, |
|
union acpi_object *argv4) |
|
{ |
|
acpi_status ret; |
|
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; |
|
union acpi_object params[4]; |
|
struct acpi_object_list input = { |
|
.count = 4, |
|
.pointer = params, |
|
}; |
|
|
|
params[0].type = ACPI_TYPE_BUFFER; |
|
params[0].buffer.length = 16; |
|
params[0].buffer.pointer = (u8 *)guid; |
|
params[1].type = ACPI_TYPE_INTEGER; |
|
params[1].integer.value = rev; |
|
params[2].type = ACPI_TYPE_INTEGER; |
|
params[2].integer.value = func; |
|
if (argv4) { |
|
params[3] = *argv4; |
|
} else { |
|
params[3].type = ACPI_TYPE_PACKAGE; |
|
params[3].package.count = 0; |
|
params[3].package.elements = NULL; |
|
} |
|
|
|
ret = acpi_evaluate_object(handle, "_DSM", &input, &buf); |
|
if (ACPI_SUCCESS(ret)) |
|
return (union acpi_object *)buf.pointer; |
|
|
|
if (ret != AE_NOT_FOUND) |
|
acpi_handle_warn(handle, |
|
"failed to evaluate _DSM (0x%x)\n", ret); |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(acpi_evaluate_dsm); |
|
|
|
/** |
|
* acpi_check_dsm - check if _DSM method supports requested functions. |
|
* @handle: ACPI device handle |
|
* @guid: GUID of requested functions, should be 16 bytes at least |
|
* @rev: revision number of requested functions |
|
* @funcs: bitmap of requested functions |
|
* |
|
* Evaluate device's _DSM method to check whether it supports requested |
|
* functions. Currently only support 64 functions at maximum, should be |
|
* enough for now. |
|
*/ |
|
bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs) |
|
{ |
|
int i; |
|
u64 mask = 0; |
|
union acpi_object *obj; |
|
|
|
if (funcs == 0) |
|
return false; |
|
|
|
obj = acpi_evaluate_dsm(handle, guid, rev, 0, NULL); |
|
if (!obj) |
|
return false; |
|
|
|
/* For compatibility, old BIOSes may return an integer */ |
|
if (obj->type == ACPI_TYPE_INTEGER) |
|
mask = obj->integer.value; |
|
else if (obj->type == ACPI_TYPE_BUFFER) |
|
for (i = 0; i < obj->buffer.length && i < 8; i++) |
|
mask |= (((u64)obj->buffer.pointer[i]) << (i * 8)); |
|
ACPI_FREE(obj); |
|
|
|
/* |
|
* Bit 0 indicates whether there's support for any functions other than |
|
* function 0 for the specified GUID and revision. |
|
*/ |
|
if ((mask & 0x1) && (mask & funcs) == funcs) |
|
return true; |
|
|
|
return false; |
|
} |
|
EXPORT_SYMBOL(acpi_check_dsm); |
|
|
|
/** |
|
* acpi_dev_hid_uid_match - Match device by supplied HID and UID |
|
* @adev: ACPI device to match. |
|
* @hid2: Hardware ID of the device. |
|
* @uid2: Unique ID of the device, pass NULL to not check _UID. |
|
* |
|
* Matches HID and UID in @adev with given @hid2 and @uid2. |
|
* Returns true if matches. |
|
*/ |
|
bool acpi_dev_hid_uid_match(struct acpi_device *adev, |
|
const char *hid2, const char *uid2) |
|
{ |
|
const char *hid1 = acpi_device_hid(adev); |
|
const char *uid1 = acpi_device_uid(adev); |
|
|
|
if (strcmp(hid1, hid2)) |
|
return false; |
|
|
|
if (!uid2) |
|
return true; |
|
|
|
return uid1 && !strcmp(uid1, uid2); |
|
} |
|
EXPORT_SYMBOL(acpi_dev_hid_uid_match); |
|
|
|
/** |
|
* acpi_dev_found - Detect presence of a given ACPI device in the namespace. |
|
* @hid: Hardware ID of the device. |
|
* |
|
* Return %true if the device was present at the moment of invocation. |
|
* Note that if the device is pluggable, it may since have disappeared. |
|
* |
|
* For this function to work, acpi_bus_scan() must have been executed |
|
* which happens in the subsys_initcall() subsection. Hence, do not |
|
* call from a subsys_initcall() or earlier (use acpi_get_devices() |
|
* instead). Calling from module_init() is fine (which is synonymous |
|
* with device_initcall()). |
|
*/ |
|
bool acpi_dev_found(const char *hid) |
|
{ |
|
struct acpi_device_bus_id *acpi_device_bus_id; |
|
bool found = false; |
|
|
|
mutex_lock(&acpi_device_lock); |
|
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) |
|
if (!strcmp(acpi_device_bus_id->bus_id, hid)) { |
|
found = true; |
|
break; |
|
} |
|
mutex_unlock(&acpi_device_lock); |
|
|
|
return found; |
|
} |
|
EXPORT_SYMBOL(acpi_dev_found); |
|
|
|
struct acpi_dev_match_info { |
|
struct acpi_device_id hid[2]; |
|
const char *uid; |
|
s64 hrv; |
|
}; |
|
|
|
static int acpi_dev_match_cb(struct device *dev, const void *data) |
|
{ |
|
struct acpi_device *adev = to_acpi_device(dev); |
|
const struct acpi_dev_match_info *match = data; |
|
unsigned long long hrv; |
|
acpi_status status; |
|
|
|
if (acpi_match_device_ids(adev, match->hid)) |
|
return 0; |
|
|
|
if (match->uid && (!adev->pnp.unique_id || |
|
strcmp(adev->pnp.unique_id, match->uid))) |
|
return 0; |
|
|
|
if (match->hrv == -1) |
|
return 1; |
|
|
|
status = acpi_evaluate_integer(adev->handle, "_HRV", NULL, &hrv); |
|
if (ACPI_FAILURE(status)) |
|
return 0; |
|
|
|
return hrv == match->hrv; |
|
} |
|
|
|
/** |
|
* acpi_dev_present - Detect that a given ACPI device is present |
|
* @hid: Hardware ID of the device. |
|
* @uid: Unique ID of the device, pass NULL to not check _UID |
|
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV |
|
* |
|
* Return %true if a matching device was present at the moment of invocation. |
|
* Note that if the device is pluggable, it may since have disappeared. |
|
* |
|
* Note that unlike acpi_dev_found() this function checks the status |
|
* of the device. So for devices which are present in the dsdt, but |
|
* which are disabled (their _STA callback returns 0) this function |
|
* will return false. |
|
* |
|
* For this function to work, acpi_bus_scan() must have been executed |
|
* which happens in the subsys_initcall() subsection. Hence, do not |
|
* call from a subsys_initcall() or earlier (use acpi_get_devices() |
|
* instead). Calling from module_init() is fine (which is synonymous |
|
* with device_initcall()). |
|
*/ |
|
bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) |
|
{ |
|
struct acpi_dev_match_info match = {}; |
|
struct device *dev; |
|
|
|
strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); |
|
match.uid = uid; |
|
match.hrv = hrv; |
|
|
|
dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); |
|
put_device(dev); |
|
return !!dev; |
|
} |
|
EXPORT_SYMBOL(acpi_dev_present); |
|
|
|
/** |
|
* acpi_dev_get_next_match_dev - Return the next match of ACPI device |
|
* @adev: Pointer to the previous acpi_device matching this @hid, @uid and @hrv |
|
* @hid: Hardware ID of the device. |
|
* @uid: Unique ID of the device, pass NULL to not check _UID |
|
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV |
|
* |
|
* Return the next match of ACPI device if another matching device was present |
|
* at the moment of invocation, or NULL otherwise. |
|
* |
|
* The caller is responsible to call put_device() on the returned device. |
|
* |
|
* See additional information in acpi_dev_present() as well. |
|
*/ |
|
struct acpi_device * |
|
acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv) |
|
{ |
|
struct device *start = adev ? &adev->dev : NULL; |
|
struct acpi_dev_match_info match = {}; |
|
struct device *dev; |
|
|
|
strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); |
|
match.uid = uid; |
|
match.hrv = hrv; |
|
|
|
dev = bus_find_device(&acpi_bus_type, start, &match, acpi_dev_match_cb); |
|
return dev ? to_acpi_device(dev) : NULL; |
|
} |
|
EXPORT_SYMBOL(acpi_dev_get_next_match_dev); |
|
|
|
/** |
|
* acpi_dev_get_first_match_dev - Return the first match of ACPI device |
|
* @hid: Hardware ID of the device. |
|
* @uid: Unique ID of the device, pass NULL to not check _UID |
|
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV |
|
* |
|
* Return the first match of ACPI device if a matching device was present |
|
* at the moment of invocation, or NULL otherwise. |
|
* |
|
* The caller is responsible to call put_device() on the returned device. |
|
* |
|
* See additional information in acpi_dev_present() as well. |
|
*/ |
|
struct acpi_device * |
|
acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) |
|
{ |
|
return acpi_dev_get_next_match_dev(NULL, hid, uid, hrv); |
|
} |
|
EXPORT_SYMBOL(acpi_dev_get_first_match_dev); |
|
|
|
/* |
|
* acpi_backlight= handling, this is done here rather then in video_detect.c |
|
* because __setup cannot be used in modules. |
|
*/ |
|
char acpi_video_backlight_string[16]; |
|
EXPORT_SYMBOL(acpi_video_backlight_string); |
|
|
|
static int __init acpi_backlight(char *str) |
|
{ |
|
strlcpy(acpi_video_backlight_string, str, |
|
sizeof(acpi_video_backlight_string)); |
|
return 1; |
|
} |
|
__setup("acpi_backlight=", acpi_backlight); |
|
|
|
/** |
|
* acpi_match_platform_list - Check if the system matches with a given list |
|
* @plat: pointer to acpi_platform_list table terminated by a NULL entry |
|
* |
|
* Return the matched index if the system is found in the platform list. |
|
* Otherwise, return a negative error code. |
|
*/ |
|
int acpi_match_platform_list(const struct acpi_platform_list *plat) |
|
{ |
|
struct acpi_table_header hdr; |
|
int idx = 0; |
|
|
|
if (acpi_disabled) |
|
return -ENODEV; |
|
|
|
for (; plat->oem_id[0]; plat++, idx++) { |
|
if (ACPI_FAILURE(acpi_get_table_header(plat->table, 0, &hdr))) |
|
continue; |
|
|
|
if (strncmp(plat->oem_id, hdr.oem_id, ACPI_OEM_ID_SIZE)) |
|
continue; |
|
|
|
if (strncmp(plat->oem_table_id, hdr.oem_table_id, ACPI_OEM_TABLE_ID_SIZE)) |
|
continue; |
|
|
|
if ((plat->pred == all_versions) || |
|
(plat->pred == less_than_or_equal && hdr.oem_revision <= plat->oem_revision) || |
|
(plat->pred == greater_than_or_equal && hdr.oem_revision >= plat->oem_revision) || |
|
(plat->pred == equal && hdr.oem_revision == plat->oem_revision)) |
|
return idx; |
|
} |
|
|
|
return -ENODEV; |
|
} |
|
EXPORT_SYMBOL(acpi_match_platform_list);
|
|
|