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1 | /* |
2 | * ACPI support for platform bus type. | |
3 | * | |
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> | |
8 | * | |
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. | |
12 | */ | |
13 | ||
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> | |
19 | ||
5923f986 AS |
20 | #include "internal.h" |
21 | ||
91e56878 MW |
22 | ACPI_MODULE_NAME("platform"); |
23 | ||
91e56878 MW |
24 | /** |
25 | * acpi_create_platform_device - Create platform device for ACPI device node | |
26 | * @adev: ACPI device node to create a platform device for. | |
27 | * | |
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. | |
31 | * | |
7eaa2800 | 32 | * Name of the platform device will be the same as @adev's. |
91e56878 MW |
33 | */ |
34 | struct platform_device *acpi_create_platform_device(struct acpi_device *adev) | |
35 | { | |
36 | struct platform_device *pdev = NULL; | |
37 | struct acpi_device *acpi_parent; | |
863f9f30 | 38 | struct platform_device_info pdevinfo; |
8e345c99 RW |
39 | struct resource_list_entry *rentry; |
40 | struct list_head resource_list; | |
41 | struct resource *resources; | |
42 | int count; | |
91e56878 MW |
43 | |
44 | /* If the ACPI node already has a physical device attached, skip it. */ | |
45 | if (adev->physical_node_count) | |
46 | return NULL; | |
47 | ||
8e345c99 RW |
48 | INIT_LIST_HEAD(&resource_list); |
49 | count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
50 | if (count <= 0) | |
91e56878 MW |
51 | return NULL; |
52 | ||
8e345c99 RW |
53 | resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL); |
54 | if (!resources) { | |
55 | dev_err(&adev->dev, "No memory for resources\n"); | |
56 | acpi_dev_free_resource_list(&resource_list); | |
91e56878 MW |
57 | return NULL; |
58 | } | |
8e345c99 RW |
59 | count = 0; |
60 | list_for_each_entry(rentry, &resource_list, node) | |
61 | resources[count++] = rentry->res; | |
91e56878 | 62 | |
8e345c99 | 63 | acpi_dev_free_resource_list(&resource_list); |
91e56878 | 64 | |
863f9f30 | 65 | memset(&pdevinfo, 0, sizeof(pdevinfo)); |
91e56878 MW |
66 | /* |
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. | |
70 | */ | |
863f9f30 | 71 | pdevinfo.parent = NULL; |
91e56878 MW |
72 | acpi_parent = adev->parent; |
73 | if (acpi_parent) { | |
74 | struct acpi_device_physical_node *entry; | |
75 | struct list_head *list; | |
76 | ||
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, | |
82 | node); | |
863f9f30 | 83 | pdevinfo.parent = entry->dev; |
91e56878 MW |
84 | } |
85 | mutex_unlock(&acpi_parent->physical_node_lock); | |
86 | } | |
863f9f30 RW |
87 | pdevinfo.name = dev_name(&adev->dev); |
88 | pdevinfo.id = -1; | |
89 | pdevinfo.res = resources; | |
90 | pdevinfo.num_res = count; | |
91 | pdevinfo.acpi_node.handle = adev->handle; | |
92 | pdev = platform_device_register_full(&pdevinfo); | |
91e56878 MW |
93 | if (IS_ERR(pdev)) { |
94 | dev_err(&adev->dev, "platform device creation failed: %ld\n", | |
95 | PTR_ERR(pdev)); | |
96 | pdev = NULL; | |
97 | } else { | |
98 | dev_dbg(&adev->dev, "created platform device %s\n", | |
99 | dev_name(&pdev->dev)); | |
100 | } | |
101 | ||
8e345c99 | 102 | kfree(resources); |
91e56878 MW |
103 | return pdev; |
104 | } |