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 {"ACPI0009", 0}, /* IOxAPIC */
31 {"ACPI000A", 0}, /* IOAPIC */
32 {"SMB0001", 0}, /* ACPI SMBUS virtual device */
33 {"", 0},
34 };
35
36 /**
37 * acpi_create_platform_device - Create platform device for ACPI device node
38 * @adev: ACPI device node to create a platform device for.
39 *
40 * Check if the given @adev can be represented as a platform device and, if
41 * that's the case, create and register a platform device, populate its common
42 * resources and returns a pointer to it. Otherwise, return %NULL.
43 *
44 * Name of the platform device will be the same as @adev's.
45 */
acpi_create_platform_device(struct acpi_device * adev)46 struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
47 {
48 struct platform_device *pdev = NULL;
49 struct acpi_device *acpi_parent;
50 struct platform_device_info pdevinfo;
51 struct resource_entry *rentry;
52 struct list_head resource_list;
53 struct resource *resources = NULL;
54 int count;
55
56 /* If the ACPI node already has a physical device attached, skip it. */
57 if (adev->physical_node_count)
58 return NULL;
59
60 if (!acpi_match_device_ids(adev, forbidden_id_list))
61 return ERR_PTR(-EINVAL);
62
63 INIT_LIST_HEAD(&resource_list);
64 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
65 if (count < 0) {
66 return NULL;
67 } else if (count > 0) {
68 resources = kmalloc(count * sizeof(struct resource),
69 GFP_KERNEL);
70 if (!resources) {
71 dev_err(&adev->dev, "No memory for resources\n");
72 acpi_dev_free_resource_list(&resource_list);
73 return ERR_PTR(-ENOMEM);
74 }
75 count = 0;
76 list_for_each_entry(rentry, &resource_list, node)
77 resources[count++] = *rentry->res;
78
79 acpi_dev_free_resource_list(&resource_list);
80 }
81
82 memset(&pdevinfo, 0, sizeof(pdevinfo));
83 /*
84 * If the ACPI node has a parent and that parent has a physical device
85 * attached to it, that physical device should be the parent of the
86 * platform device we are about to create.
87 */
88 pdevinfo.parent = NULL;
89 acpi_parent = adev->parent;
90 if (acpi_parent) {
91 struct acpi_device_physical_node *entry;
92 struct list_head *list;
93
94 mutex_lock(&acpi_parent->physical_node_lock);
95 list = &acpi_parent->physical_node_list;
96 if (!list_empty(list)) {
97 entry = list_first_entry(list,
98 struct acpi_device_physical_node,
99 node);
100 pdevinfo.parent = entry->dev;
101 }
102 mutex_unlock(&acpi_parent->physical_node_lock);
103 }
104 pdevinfo.name = dev_name(&adev->dev);
105 pdevinfo.id = -1;
106 pdevinfo.res = resources;
107 pdevinfo.num_res = count;
108 pdevinfo.fwnode = acpi_fwnode_handle(adev);
109
110 if (acpi_dma_supported(adev))
111 pdevinfo.dma_mask = DMA_BIT_MASK(32);
112 else
113 pdevinfo.dma_mask = 0;
114
115 pdev = platform_device_register_full(&pdevinfo);
116 if (IS_ERR(pdev))
117 dev_err(&adev->dev, "platform device creation failed: %ld\n",
118 PTR_ERR(pdev));
119 else
120 dev_dbg(&adev->dev, "created platform device %s\n",
121 dev_name(&pdev->dev));
122
123 kfree(resources);
124 return pdev;
125 }
126 EXPORT_SYMBOL_GPL(acpi_create_platform_device);
127