131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
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* ACPI support for platform bus type.
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*
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* Copyright (C) 2012, Intel Corporation
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* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
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* Mathias Nyman <mathias.nyman@linux.intel.com>
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* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include "internal.h"
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ACPI_MODULE_NAME("platform");
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/*
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* The following ACPI IDs are known to be suitable for representing as
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* platform devices.
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*/
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static const struct acpi_device_id acpi_platform_device_ids[] = {
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{ "PNP0D40" },
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{ }
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};
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/**
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* acpi_create_platform_device - Create platform device for ACPI device node
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* @adev: ACPI device node to create a platform device for.
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* @id: ACPI device ID used to match @adev.
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*
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* Check if the given @adev can be represented as a platform device and, if
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* that's the case, create and register a platform device, populate its common
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* resources and returns a pointer to it. Otherwise, return %NULL.
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*
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* Name of the platform device will be the same as @adev's.
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*/
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int acpi_create_platform_device(struct acpi_device *adev,
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const struct acpi_device_id *id)
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{
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struct platform_device *pdev = NULL;
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struct acpi_device *acpi_parent;
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struct platform_device_info pdevinfo;
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struct resource_list_entry *rentry;
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struct list_head resource_list;
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struct resource *resources = NULL;
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int count;
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/* If the ACPI node already has a physical device attached, skip it. */
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if (adev->physical_node_count)
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return 0;
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INIT_LIST_HEAD(&resource_list);
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count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
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if (count < 0) {
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return 0;
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} else if (count > 0) {
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resources = kmalloc(count * sizeof(struct resource),
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GFP_KERNEL);
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if (!resources) {
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dev_err(&adev->dev, "No memory for resources\n");
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acpi_dev_free_resource_list(&resource_list);
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return -ENOMEM;
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}
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count = 0;
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list_for_each_entry(rentry, &resource_list, node)
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resources[count++] = rentry->res;
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acpi_dev_free_resource_list(&resource_list);
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}
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memset(&pdevinfo, 0, sizeof(pdevinfo));
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/*
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* If the ACPI node has a parent and that parent has a physical device
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* attached to it, that physical device should be the parent of the
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* platform device we are about to create.
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*/
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pdevinfo.parent = NULL;
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acpi_parent = adev->parent;
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if (acpi_parent) {
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struct acpi_device_physical_node *entry;
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struct list_head *list;
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mutex_lock(&acpi_parent->physical_node_lock);
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list = &acpi_parent->physical_node_list;
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if (!list_empty(list)) {
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entry = list_first_entry(list,
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struct acpi_device_physical_node,
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node);
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pdevinfo.parent = entry->dev;
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}
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mutex_unlock(&acpi_parent->physical_node_lock);
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}
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pdevinfo.name = dev_name(&adev->dev);
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pdevinfo.id = -1;
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pdevinfo.res = resources;
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pdevinfo.num_res = count;
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pdevinfo.acpi_node.handle = adev->handle;
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pdev = platform_device_register_full(&pdevinfo);
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if (IS_ERR(pdev)) {
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dev_err(&adev->dev, "platform device creation failed: %ld\n",
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PTR_ERR(pdev));
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pdev = NULL;
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} else {
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dev_dbg(&adev->dev, "created platform device %s\n",
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dev_name(&pdev->dev));
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}
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kfree(resources);
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return 1;
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}
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static struct acpi_scan_handler platform_handler = {
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.ids = acpi_platform_device_ids,
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.attach = acpi_create_platform_device,
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};
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void __init acpi_platform_init(void)
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{
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acpi_scan_add_handler(&platform_handler);
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}
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