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
));