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91e56878 MW |
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> | |
e375325c | 16 | #include <linux/err.h> |
91e56878 MW |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | ||
5923f986 AS |
21 | #include "internal.h" |
22 | ||
91e56878 MW |
23 | ACPI_MODULE_NAME("platform"); |
24 | ||
141a297b RW |
25 | /* |
26 | * The following ACPI IDs are known to be suitable for representing as | |
27 | * platform devices. | |
28 | */ | |
29 | static const struct acpi_device_id acpi_platform_device_ids[] = { | |
30 | ||
31 | { "PNP0D40" }, | |
32 | ||
141a297b RW |
33 | { } |
34 | }; | |
35 | ||
91e56878 MW |
36 | /** |
37 | * acpi_create_platform_device - Create platform device for ACPI device node | |
38 | * @adev: ACPI device node to create a platform device for. | |
141a297b | 39 | * @id: ACPI device ID used to match @adev. |
91e56878 MW |
40 | * |
41 | * Check if the given @adev can be represented as a platform device and, if | |
42 | * that's the case, create and register a platform device, populate its common | |
43 | * resources and returns a pointer to it. Otherwise, return %NULL. | |
44 | * | |
7eaa2800 | 45 | * Name of the platform device will be the same as @adev's. |
91e56878 | 46 | */ |
f58b082a RW |
47 | int acpi_create_platform_device(struct acpi_device *adev, |
48 | const struct acpi_device_id *id) | |
91e56878 MW |
49 | { |
50 | struct platform_device *pdev = NULL; | |
51 | struct acpi_device *acpi_parent; | |
863f9f30 | 52 | struct platform_device_info pdevinfo; |
8e345c99 RW |
53 | struct resource_list_entry *rentry; |
54 | struct list_head resource_list; | |
55 | struct resource *resources; | |
56 | int count; | |
91e56878 MW |
57 | |
58 | /* If the ACPI node already has a physical device attached, skip it. */ | |
59 | if (adev->physical_node_count) | |
141a297b | 60 | return 0; |
91e56878 | 61 | |
8e345c99 RW |
62 | INIT_LIST_HEAD(&resource_list); |
63 | count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
64 | if (count <= 0) | |
141a297b | 65 | return 0; |
91e56878 | 66 | |
8e345c99 RW |
67 | resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL); |
68 | if (!resources) { | |
69 | dev_err(&adev->dev, "No memory for resources\n"); | |
70 | acpi_dev_free_resource_list(&resource_list); | |
141a297b | 71 | return -ENOMEM; |
91e56878 | 72 | } |
8e345c99 RW |
73 | count = 0; |
74 | list_for_each_entry(rentry, &resource_list, node) | |
75 | resources[count++] = rentry->res; | |
91e56878 | 76 | |
8e345c99 | 77 | acpi_dev_free_resource_list(&resource_list); |
91e56878 | 78 | |
863f9f30 | 79 | memset(&pdevinfo, 0, sizeof(pdevinfo)); |
91e56878 MW |
80 | /* |
81 | * If the ACPI node has a parent and that parent has a physical device | |
82 | * attached to it, that physical device should be the parent of the | |
83 | * platform device we are about to create. | |
84 | */ | |
863f9f30 | 85 | pdevinfo.parent = NULL; |
91e56878 MW |
86 | acpi_parent = adev->parent; |
87 | if (acpi_parent) { | |
88 | struct acpi_device_physical_node *entry; | |
89 | struct list_head *list; | |
90 | ||
91 | mutex_lock(&acpi_parent->physical_node_lock); | |
92 | list = &acpi_parent->physical_node_list; | |
93 | if (!list_empty(list)) { | |
94 | entry = list_first_entry(list, | |
95 | struct acpi_device_physical_node, | |
96 | node); | |
863f9f30 | 97 | pdevinfo.parent = entry->dev; |
91e56878 MW |
98 | } |
99 | mutex_unlock(&acpi_parent->physical_node_lock); | |
100 | } | |
863f9f30 RW |
101 | pdevinfo.name = dev_name(&adev->dev); |
102 | pdevinfo.id = -1; | |
103 | pdevinfo.res = resources; | |
104 | pdevinfo.num_res = count; | |
105 | pdevinfo.acpi_node.handle = adev->handle; | |
106 | pdev = platform_device_register_full(&pdevinfo); | |
91e56878 MW |
107 | if (IS_ERR(pdev)) { |
108 | dev_err(&adev->dev, "platform device creation failed: %ld\n", | |
109 | PTR_ERR(pdev)); | |
110 | pdev = NULL; | |
111 | } else { | |
112 | dev_dbg(&adev->dev, "created platform device %s\n", | |
113 | dev_name(&pdev->dev)); | |
114 | } | |
115 | ||
8e345c99 | 116 | kfree(resources); |
141a297b RW |
117 | return 1; |
118 | } | |
119 | ||
120 | static struct acpi_scan_handler platform_handler = { | |
121 | .ids = acpi_platform_device_ids, | |
122 | .attach = acpi_create_platform_device, | |
123 | }; | |
124 | ||
125 | void __init acpi_platform_init(void) | |
126 | { | |
127 | acpi_scan_add_handler(&platform_handler); | |
91e56878 | 128 | } |