Merge tag 'pm+acpi-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[sfrench/cifs-2.6.git] / drivers / acpi / acpi_platform.c
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/err.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/platform_device.h>
21
22 #include "internal.h"
23
24 ACPI_MODULE_NAME("platform");
25
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},
31 };
32
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  *
41  * Name of the platform device will be the same as @adev's.
42  */
43 struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
44 {
45         struct platform_device *pdev = NULL;
46         struct acpi_device *acpi_parent;
47         struct platform_device_info pdevinfo;
48         struct resource_list_entry *rentry;
49         struct list_head resource_list;
50         struct resource *resources = NULL;
51         int count;
52
53         /* If the ACPI node already has a physical device attached, skip it. */
54         if (adev->physical_node_count)
55                 return NULL;
56
57         if (!acpi_match_device_ids(adev, forbidden_id_list))
58                 return ERR_PTR(-EINVAL);
59
60         INIT_LIST_HEAD(&resource_list);
61         count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
62         if (count < 0) {
63                 return NULL;
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);
70                         return ERR_PTR(-ENOMEM);
71                 }
72                 count = 0;
73                 list_for_each_entry(rentry, &resource_list, node)
74                         resources[count++] = rentry->res;
75
76                 acpi_dev_free_resource_list(&resource_list);
77         }
78
79         memset(&pdevinfo, 0, sizeof(pdevinfo));
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          */
85         pdevinfo.parent = NULL;
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);
97                         pdevinfo.parent = entry->dev;
98                 }
99                 mutex_unlock(&acpi_parent->physical_node_lock);
100         }
101         pdevinfo.name = dev_name(&adev->dev);
102         pdevinfo.id = -1;
103         pdevinfo.res = resources;
104         pdevinfo.num_res = count;
105         pdevinfo.acpi_node.companion = adev;
106         pdevinfo.dma_mask = DMA_BIT_MASK(32);
107         pdev = platform_device_register_full(&pdevinfo);
108         if (IS_ERR(pdev))
109                 dev_err(&adev->dev, "platform device creation failed: %ld\n",
110                         PTR_ERR(pdev));
111         else
112                 dev_dbg(&adev->dev, "created platform device %s\n",
113                         dev_name(&pdev->dev));
114
115         kfree(resources);
116         return pdev;
117 }
118 EXPORT_SYMBOL_GPL(acpi_create_platform_device);