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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" }, | |
cc8ef527 | 32 | { "ACPI0003" }, |
b5c37b79 | 33 | { "VPC2004" }, |
9208e311 | 34 | { "BCM4752" }, |
141a297b | 35 | |
e54968ca JN |
36 | /* Intel Smart Sound Technology */ |
37 | { "INT33C8" }, | |
38 | { "80860F28" }, | |
c0ad8568 | 39 | |
141a297b RW |
40 | { } |
41 | }; | |
42 | ||
91e56878 MW |
43 | /** |
44 | * acpi_create_platform_device - Create platform device for ACPI device node | |
45 | * @adev: ACPI device node to create a platform device for. | |
141a297b | 46 | * @id: ACPI device ID used to match @adev. |
91e56878 MW |
47 | * |
48 | * Check if the given @adev can be represented as a platform device and, if | |
49 | * that's the case, create and register a platform device, populate its common | |
50 | * resources and returns a pointer to it. Otherwise, return %NULL. | |
51 | * | |
7eaa2800 | 52 | * Name of the platform device will be the same as @adev's. |
91e56878 | 53 | */ |
f58b082a RW |
54 | int acpi_create_platform_device(struct acpi_device *adev, |
55 | const struct acpi_device_id *id) | |
91e56878 MW |
56 | { |
57 | struct platform_device *pdev = NULL; | |
58 | struct acpi_device *acpi_parent; | |
863f9f30 | 59 | struct platform_device_info pdevinfo; |
8e345c99 RW |
60 | struct resource_list_entry *rentry; |
61 | struct list_head resource_list; | |
62eb4b07 | 62 | struct resource *resources = NULL; |
8e345c99 | 63 | int count; |
91e56878 MW |
64 | |
65 | /* If the ACPI node already has a physical device attached, skip it. */ | |
66 | if (adev->physical_node_count) | |
141a297b | 67 | return 0; |
91e56878 | 68 | |
8e345c99 RW |
69 | INIT_LIST_HEAD(&resource_list); |
70 | count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
d2fe7251 | 71 | if (count < 0) { |
141a297b | 72 | return 0; |
d2fe7251 RW |
73 | } else if (count > 0) { |
74 | resources = kmalloc(count * sizeof(struct resource), | |
75 | GFP_KERNEL); | |
76 | if (!resources) { | |
77 | dev_err(&adev->dev, "No memory for resources\n"); | |
78 | acpi_dev_free_resource_list(&resource_list); | |
79 | return -ENOMEM; | |
80 | } | |
81 | count = 0; | |
82 | list_for_each_entry(rentry, &resource_list, node) | |
83 | resources[count++] = rentry->res; | |
91e56878 | 84 | |
8e345c99 | 85 | acpi_dev_free_resource_list(&resource_list); |
91e56878 | 86 | } |
91e56878 | 87 | |
863f9f30 | 88 | memset(&pdevinfo, 0, sizeof(pdevinfo)); |
91e56878 MW |
89 | /* |
90 | * If the ACPI node has a parent and that parent has a physical device | |
91 | * attached to it, that physical device should be the parent of the | |
92 | * platform device we are about to create. | |
93 | */ | |
863f9f30 | 94 | pdevinfo.parent = NULL; |
91e56878 MW |
95 | acpi_parent = adev->parent; |
96 | if (acpi_parent) { | |
97 | struct acpi_device_physical_node *entry; | |
98 | struct list_head *list; | |
99 | ||
100 | mutex_lock(&acpi_parent->physical_node_lock); | |
101 | list = &acpi_parent->physical_node_list; | |
102 | if (!list_empty(list)) { | |
103 | entry = list_first_entry(list, | |
104 | struct acpi_device_physical_node, | |
105 | node); | |
863f9f30 | 106 | pdevinfo.parent = entry->dev; |
91e56878 MW |
107 | } |
108 | mutex_unlock(&acpi_parent->physical_node_lock); | |
109 | } | |
863f9f30 RW |
110 | pdevinfo.name = dev_name(&adev->dev); |
111 | pdevinfo.id = -1; | |
112 | pdevinfo.res = resources; | |
113 | pdevinfo.num_res = count; | |
7b199811 | 114 | pdevinfo.acpi_node.companion = adev; |
863f9f30 | 115 | pdev = platform_device_register_full(&pdevinfo); |
91e56878 MW |
116 | if (IS_ERR(pdev)) { |
117 | dev_err(&adev->dev, "platform device creation failed: %ld\n", | |
118 | PTR_ERR(pdev)); | |
119 | pdev = NULL; | |
120 | } else { | |
121 | dev_dbg(&adev->dev, "created platform device %s\n", | |
122 | dev_name(&pdev->dev)); | |
123 | } | |
124 | ||
8e345c99 | 125 | kfree(resources); |
141a297b RW |
126 | return 1; |
127 | } | |
128 | ||
129 | static struct acpi_scan_handler platform_handler = { | |
130 | .ids = acpi_platform_device_ids, | |
131 | .attach = acpi_create_platform_device, | |
132 | }; | |
133 | ||
134 | void __init acpi_platform_init(void) | |
135 | { | |
136 | acpi_scan_add_handler(&platform_handler); | |
91e56878 | 137 | } |