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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> | |
8a2f38dd | 19 | #include <linux/dma-mapping.h> |
91e56878 MW |
20 | #include <linux/platform_device.h> |
21 | ||
5923f986 AS |
22 | #include "internal.h" |
23 | ||
91e56878 MW |
24 | ACPI_MODULE_NAME("platform"); |
25 | ||
48459340 ZR |
26 | static const struct acpi_device_id forbidden_id_list[] = { |
27 | {"PNP0000", 0}, /* PIC */ | |
28 | {"PNP0100", 0}, /* Timer */ | |
29 | {"PNP0200", 0}, /* AT DMA Controller */ | |
30 | {"", 0}, | |
141a297b RW |
31 | }; |
32 | ||
91e56878 MW |
33 | /** |
34 | * acpi_create_platform_device - Create platform device for ACPI device node | |
35 | * @adev: ACPI device node to create a platform device for. | |
36 | * | |
37 | * Check if the given @adev can be represented as a platform device and, if | |
38 | * that's the case, create and register a platform device, populate its common | |
39 | * resources and returns a pointer to it. Otherwise, return %NULL. | |
40 | * | |
7eaa2800 | 41 | * Name of the platform device will be the same as @adev's. |
91e56878 | 42 | */ |
8ce62f85 | 43 | struct platform_device *acpi_create_platform_device(struct acpi_device *adev) |
91e56878 MW |
44 | { |
45 | struct platform_device *pdev = NULL; | |
46 | struct acpi_device *acpi_parent; | |
863f9f30 | 47 | struct platform_device_info pdevinfo; |
8e345c99 RW |
48 | struct resource_list_entry *rentry; |
49 | struct list_head resource_list; | |
62eb4b07 | 50 | struct resource *resources = NULL; |
8e345c99 | 51 | int count; |
91e56878 MW |
52 | |
53 | /* If the ACPI node already has a physical device attached, skip it. */ | |
54 | if (adev->physical_node_count) | |
8ce62f85 | 55 | return NULL; |
91e56878 | 56 | |
48459340 ZR |
57 | if (!acpi_match_device_ids(adev, forbidden_id_list)) |
58 | return ERR_PTR(-EINVAL); | |
59 | ||
8e345c99 RW |
60 | INIT_LIST_HEAD(&resource_list); |
61 | count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
d2fe7251 | 62 | if (count < 0) { |
8ce62f85 | 63 | return NULL; |
d2fe7251 RW |
64 | } else if (count > 0) { |
65 | resources = kmalloc(count * sizeof(struct resource), | |
66 | GFP_KERNEL); | |
67 | if (!resources) { | |
68 | dev_err(&adev->dev, "No memory for resources\n"); | |
69 | acpi_dev_free_resource_list(&resource_list); | |
8ce62f85 | 70 | return ERR_PTR(-ENOMEM); |
d2fe7251 RW |
71 | } |
72 | count = 0; | |
73 | list_for_each_entry(rentry, &resource_list, node) | |
74 | resources[count++] = rentry->res; | |
91e56878 | 75 | |
8e345c99 | 76 | acpi_dev_free_resource_list(&resource_list); |
91e56878 | 77 | } |
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; | |
7b199811 | 105 | pdevinfo.acpi_node.companion = adev; |
8a2f38dd | 106 | pdevinfo.dma_mask = DMA_BIT_MASK(32); |
863f9f30 | 107 | pdev = platform_device_register_full(&pdevinfo); |
8ce62f85 | 108 | if (IS_ERR(pdev)) |
91e56878 MW |
109 | dev_err(&adev->dev, "platform device creation failed: %ld\n", |
110 | PTR_ERR(pdev)); | |
8ce62f85 | 111 | else |
91e56878 MW |
112 | dev_dbg(&adev->dev, "created platform device %s\n", |
113 | dev_name(&pdev->dev)); | |
91e56878 | 114 | |
8e345c99 | 115 | kfree(resources); |
8ce62f85 RW |
116 | return pdev; |
117 | } | |
083bf668 | 118 | EXPORT_SYMBOL_GPL(acpi_create_platform_device); |