forked from Minki/linux
35009c8074
There are users outside of ACPI realm which reimplementing the comparator function to check if the given device matches to given HID and UID. For better utilization, introduce a helper for everyone to use. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
902 lines
23 KiB
C
902 lines
23 KiB
C
// 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 <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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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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#define _COMPONENT ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("utils");
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/* --------------------------------------------------------------------------
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Object Evaluation Helpers
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-------------------------------------------------------------------------- */
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static void
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acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
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{
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#ifdef ACPI_DEBUG_OUTPUT
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char prefix[80] = {'\0'};
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struct acpi_buffer buffer = {sizeof(prefix), prefix};
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acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",
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(char *) prefix, p, acpi_format_exception(s)));
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#else
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return;
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#endif
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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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printk(KERN_WARNING PREFIX "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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printk(KERN_WARNING PREFIX "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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printk(KERN_WARNING PREFIX "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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printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
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" than exist in package [%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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printk(KERN_WARNING PREFIX "Invalid package element"
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" [%d]: got number, expecting"
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" [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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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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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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printk(KERN_WARNING PREFIX "Invalid package element"
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" [%d] got string/buffer,"
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" expecting [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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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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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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printk(KERN_WARNING PREFIX "Invalid package element"
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" [%d] got reference,"
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" expecting [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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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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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Found unsupported element at index=%d\n",
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i));
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/* TBD: handle nested packages... */
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return AE_SUPPORT;
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break;
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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_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
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list->handles[i]));
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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,
|
|
u64 arg)
|
|
{
|
|
union acpi_object obj = { .type = ACPI_TYPE_INTEGER };
|
|
struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, };
|
|
|
|
obj.integer.value = arg;
|
|
|
|
return acpi_evaluate_object(handle, method, &arg_list, NULL);
|
|
}
|
|
EXPORT_SYMBOL(acpi_execute_simple_method);
|
|
|
|
/**
|
|
* acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations
|
|
* @handle: ACPI device handle
|
|
*
|
|
* Evaluate device's _EJ0 method for hotplug operations.
|
|
*/
|
|
acpi_status acpi_evaluate_ej0(acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
|
|
status = acpi_execute_simple_method(handle, "_EJ0", 1);
|
|
if (status == AE_NOT_FOUND)
|
|
acpi_handle_warn(handle, "No _EJ0 support for device\n");
|
|
else if (ACPI_FAILURE(status))
|
|
acpi_handle_warn(handle, "Eject failed (0x%x)\n", status);
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device
|
|
* @handle: ACPI device handle
|
|
* @lock: lock device if non-zero, otherwise unlock device
|
|
*
|
|
* Evaluate device's _LCK method if present to lock/unlock device
|
|
*/
|
|
acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
|
|
{
|
|
acpi_status status;
|
|
|
|
status = acpi_execute_simple_method(handle, "_LCK", !!lock);
|
|
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
|
|
if (lock)
|
|
acpi_handle_warn(handle,
|
|
"Locking device failed (0x%x)\n", status);
|
|
else
|
|
acpi_handle_warn(handle,
|
|
"Unlocking device failed (0x%x)\n", status);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* acpi_evaluate_dsm - evaluate device's _DSM method
|
|
* @handle: ACPI device handle
|
|
* @guid: GUID of requested functions, should be 16 bytes
|
|
* @rev: revision number of requested function
|
|
* @func: requested function number
|
|
* @argv4: the function specific parameter
|
|
*
|
|
* Evaluate device's _DSM method with specified GUID, revision id and
|
|
* function number. Caller needs to free the returned object.
|
|
*
|
|
* 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_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)
|
|
{
|
|
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);
|
|
return dev ? to_acpi_device(dev) : NULL;
|
|
}
|
|
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);
|