2 * ACPI support for platform bus type.
4 * Copyright (C) 2012, Intel Corporation
5 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
6 * Mathias Nyman <mathias.nyman@linux.intel.com>
7 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/acpi.h>
15 #include <linux/device.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
22 ACPI_MODULE_NAME("platform");
25 * acpi_create_platform_device - Create platform device for ACPI device node
26 * @adev: ACPI device node to create a platform device for.
28 * Check if the given @adev can be represented as a platform device and, if
29 * that's the case, create and register a platform device, populate its common
30 * resources and returns a pointer to it. Otherwise, return %NULL.
32 * The platform device's name will be taken from the @adev's _HID and _UID.
34 struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
36 struct platform_device *pdev = NULL;
37 struct acpi_device *acpi_parent;
38 struct platform_device_info pdevinfo;
39 struct resource_list_entry *rentry;
40 struct list_head resource_list;
41 struct resource *resources;
44 /* If the ACPI node already has a physical device attached, skip it. */
45 if (adev->physical_node_count)
48 INIT_LIST_HEAD(&resource_list);
49 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
53 resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
55 dev_err(&adev->dev, "No memory for resources\n");
56 acpi_dev_free_resource_list(&resource_list);
60 list_for_each_entry(rentry, &resource_list, node)
61 resources[count++] = rentry->res;
63 acpi_dev_free_resource_list(&resource_list);
65 memset(&pdevinfo, 0, sizeof(pdevinfo));
67 * If the ACPI node has a parent and that parent has a physical device
68 * attached to it, that physical device should be the parent of the
69 * platform device we are about to create.
71 pdevinfo.parent = NULL;
72 acpi_parent = adev->parent;
74 struct acpi_device_physical_node *entry;
75 struct list_head *list;
77 mutex_lock(&acpi_parent->physical_node_lock);
78 list = &acpi_parent->physical_node_list;
79 if (!list_empty(list)) {
80 entry = list_first_entry(list,
81 struct acpi_device_physical_node,
83 pdevinfo.parent = entry->dev;
85 mutex_unlock(&acpi_parent->physical_node_lock);
87 pdevinfo.name = dev_name(&adev->dev);
89 pdevinfo.res = resources;
90 pdevinfo.num_res = count;
91 pdevinfo.acpi_node.handle = adev->handle;
92 pdev = platform_device_register_full(&pdevinfo);
94 dev_err(&adev->dev, "platform device creation failed: %ld\n",
98 dev_dbg(&adev->dev, "created platform device %s\n",
99 dev_name(&pdev->dev));