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/pci.h>
21#include <linux/platform_device.h>
22
23#include "internal.h"
24
25ACPI_MODULE_NAME("platform");
26
27static const struct acpi_device_id forbidden_id_list[] = {
28 {"PNP0000", 0}, /* PIC */
29 {"PNP0100", 0}, /* Timer */
30 {"PNP0200", 0}, /* AT DMA Controller */
31 {"ACPI0009", 0}, /* IOxAPIC */
32 {"ACPI000A", 0}, /* IOAPIC */
33 {"SMB0001", 0}, /* ACPI SMBUS virtual device */
34 {"", 0},
35};
36
37static void acpi_platform_fill_resource(struct acpi_device *adev,
38 const struct resource *src, struct resource *dest)
39{
40 struct device *parent;
41
42 *dest = *src;
43
44 /*
45 * If the device has parent we need to take its resources into
46 * account as well because this device might consume part of those.
47 */
48 parent = acpi_get_first_physical_node(adev->parent);
49 if (parent && dev_is_pci(parent))
50 dest->parent = pci_find_resource(to_pci_dev(parent), dest);
51}
52
53/**
54 * acpi_create_platform_device - Create platform device for ACPI device node
55 * @adev: ACPI device node to create a platform device for.
56 * @properties: Optional collection of build-in properties.
57 *
58 * Check if the given @adev can be represented as a platform device and, if
59 * that's the case, create and register a platform device, populate its common
60 * resources and returns a pointer to it. Otherwise, return %NULL.
61 *
62 * Name of the platform device will be the same as @adev's.
63 */
64struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
65 struct property_entry *properties)
66{
67 struct platform_device *pdev = NULL;
68 struct platform_device_info pdevinfo;
69 struct resource_entry *rentry;
70 struct list_head resource_list;
71 struct resource *resources = NULL;
72 int count;
73
74 /* If the ACPI node already has a physical device attached, skip it. */
75 if (adev->physical_node_count)
76 return NULL;
77
78 if (!acpi_match_device_ids(adev, forbidden_id_list))
79 return ERR_PTR(-EINVAL);
80
81 INIT_LIST_HEAD(&resource_list);
82 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
83 if (count < 0) {
84 return NULL;
85 } else if (count > 0) {
86 resources = kcalloc(count, sizeof(struct resource),
87 GFP_KERNEL);
88 if (!resources) {
89 dev_err(&adev->dev, "No memory for resources\n");
90 acpi_dev_free_resource_list(&resource_list);
91 return ERR_PTR(-ENOMEM);
92 }
93 count = 0;
94 list_for_each_entry(rentry, &resource_list, node)
95 acpi_platform_fill_resource(adev, rentry->res,
96 &resources[count++]);
97
98 acpi_dev_free_resource_list(&resource_list);
99 }
100
101 memset(&pdevinfo, 0, sizeof(pdevinfo));
102 /*
103 * If the ACPI node has a parent and that parent has a physical device
104 * attached to it, that physical device should be the parent of the
105 * platform device we are about to create.
106 */
107 pdevinfo.parent = adev->parent ?
108 acpi_get_first_physical_node(adev->parent) : NULL;
109 pdevinfo.name = dev_name(&adev->dev);
110 pdevinfo.id = -1;
111 pdevinfo.res = resources;
112 pdevinfo.num_res = count;
113 pdevinfo.fwnode = acpi_fwnode_handle(adev);
114 pdevinfo.properties = properties;
115
116 if (acpi_dma_supported(adev))
117 pdevinfo.dma_mask = DMA_BIT_MASK(32);
118 else
119 pdevinfo.dma_mask = 0;
120
121 pdev = platform_device_register_full(&pdevinfo);
122 if (IS_ERR(pdev))
123 dev_err(&adev->dev, "platform device creation failed: %ld\n",
124 PTR_ERR(pdev));
125 else {
126 set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
127 dev_dbg(&adev->dev, "created platform device %s\n",
128 dev_name(&pdev->dev));
129 }
130
131 kfree(resources);
132
133 return pdev;
134}
135EXPORT_SYMBOL_GPL(acpi_create_platform_device);
136