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1 | // SPDX-License-Identifier: GPL-2.0-only | |
2 | /* | |
3 | * ACPI support for platform bus type. | |
4 | * | |
5 | * Copyright (C) 2012, Intel Corporation | |
6 | * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> | |
7 | * Mathias Nyman <mathias.nyman@linux.intel.com> | |
8 | * Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
9 | */ | |
10 | ||
11 | #include <linux/acpi.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/platform_device.h> | |
19 | ||
20 | #include "internal.h" | |
21 | ||
22 | static const struct acpi_device_id forbidden_id_list[] = { | |
23 | {"PNP0000", 0}, /* PIC */ | |
24 | {"PNP0100", 0}, /* Timer */ | |
25 | {"PNP0200", 0}, /* AT DMA Controller */ | |
26 | {"ACPI0009", 0}, /* IOxAPIC */ | |
27 | {"ACPI000A", 0}, /* IOAPIC */ | |
28 | {"SMB0001", 0}, /* ACPI SMBUS virtual device */ | |
29 | {"", 0}, | |
30 | }; | |
31 | ||
32 | static struct platform_device *acpi_platform_device_find_by_companion(struct acpi_device *adev) | |
33 | { | |
34 | struct device *dev; | |
35 | ||
36 | dev = bus_find_device_by_acpi_dev(&platform_bus_type, adev); | |
37 | return dev ? to_platform_device(dev) : NULL; | |
38 | } | |
39 | ||
40 | static int acpi_platform_device_remove_notify(struct notifier_block *nb, | |
41 | unsigned long value, void *arg) | |
42 | { | |
43 | struct acpi_device *adev = arg; | |
44 | struct platform_device *pdev; | |
45 | ||
46 | switch (value) { | |
47 | case ACPI_RECONFIG_DEVICE_ADD: | |
48 | /* Nothing to do here */ | |
49 | break; | |
50 | case ACPI_RECONFIG_DEVICE_REMOVE: | |
51 | if (!acpi_device_enumerated(adev)) | |
52 | break; | |
53 | ||
54 | pdev = acpi_platform_device_find_by_companion(adev); | |
55 | if (!pdev) | |
56 | break; | |
57 | ||
58 | platform_device_unregister(pdev); | |
59 | put_device(&pdev->dev); | |
60 | break; | |
61 | } | |
62 | ||
63 | return NOTIFY_OK; | |
64 | } | |
65 | ||
66 | static struct notifier_block acpi_platform_notifier = { | |
67 | .notifier_call = acpi_platform_device_remove_notify, | |
68 | }; | |
69 | ||
70 | static void acpi_platform_fill_resource(struct acpi_device *adev, | |
71 | const struct resource *src, struct resource *dest) | |
72 | { | |
73 | struct device *parent; | |
74 | ||
75 | *dest = *src; | |
76 | ||
77 | /* | |
78 | * If the device has parent we need to take its resources into | |
79 | * account as well because this device might consume part of those. | |
80 | */ | |
81 | parent = acpi_get_first_physical_node(adev->parent); | |
82 | if (parent && dev_is_pci(parent)) | |
83 | dest->parent = pci_find_resource(to_pci_dev(parent), dest); | |
84 | } | |
85 | ||
86 | /** | |
87 | * acpi_create_platform_device - Create platform device for ACPI device node | |
88 | * @adev: ACPI device node to create a platform device for. | |
89 | * @properties: Optional collection of build-in properties. | |
90 | * | |
91 | * Check if the given @adev can be represented as a platform device and, if | |
92 | * that's the case, create and register a platform device, populate its common | |
93 | * resources and returns a pointer to it. Otherwise, return %NULL. | |
94 | * | |
95 | * Name of the platform device will be the same as @adev's. | |
96 | */ | |
97 | struct platform_device *acpi_create_platform_device(struct acpi_device *adev, | |
98 | struct property_entry *properties) | |
99 | { | |
100 | struct platform_device *pdev = NULL; | |
101 | struct platform_device_info pdevinfo; | |
102 | struct resource_entry *rentry; | |
103 | struct list_head resource_list; | |
104 | struct resource *resources = NULL; | |
105 | int count; | |
106 | ||
107 | /* If the ACPI node already has a physical device attached, skip it. */ | |
108 | if (adev->physical_node_count) | |
109 | return NULL; | |
110 | ||
111 | if (!acpi_match_device_ids(adev, forbidden_id_list)) | |
112 | return ERR_PTR(-EINVAL); | |
113 | ||
114 | INIT_LIST_HEAD(&resource_list); | |
115 | count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
116 | if (count < 0) { | |
117 | return NULL; | |
118 | } else if (count > 0) { | |
119 | resources = kcalloc(count, sizeof(struct resource), | |
120 | GFP_KERNEL); | |
121 | if (!resources) { | |
122 | dev_err(&adev->dev, "No memory for resources\n"); | |
123 | acpi_dev_free_resource_list(&resource_list); | |
124 | return ERR_PTR(-ENOMEM); | |
125 | } | |
126 | count = 0; | |
127 | list_for_each_entry(rentry, &resource_list, node) | |
128 | acpi_platform_fill_resource(adev, rentry->res, | |
129 | &resources[count++]); | |
130 | ||
131 | acpi_dev_free_resource_list(&resource_list); | |
132 | } | |
133 | ||
134 | memset(&pdevinfo, 0, sizeof(pdevinfo)); | |
135 | /* | |
136 | * If the ACPI node has a parent and that parent has a physical device | |
137 | * attached to it, that physical device should be the parent of the | |
138 | * platform device we are about to create. | |
139 | */ | |
140 | pdevinfo.parent = adev->parent ? | |
141 | acpi_get_first_physical_node(adev->parent) : NULL; | |
142 | pdevinfo.name = dev_name(&adev->dev); | |
143 | pdevinfo.id = -1; | |
144 | pdevinfo.res = resources; | |
145 | pdevinfo.num_res = count; | |
146 | pdevinfo.fwnode = acpi_fwnode_handle(adev); | |
147 | pdevinfo.properties = properties; | |
148 | ||
149 | if (acpi_dma_supported(adev)) | |
150 | pdevinfo.dma_mask = DMA_BIT_MASK(32); | |
151 | else | |
152 | pdevinfo.dma_mask = 0; | |
153 | ||
154 | pdev = platform_device_register_full(&pdevinfo); | |
155 | if (IS_ERR(pdev)) | |
156 | dev_err(&adev->dev, "platform device creation failed: %ld\n", | |
157 | PTR_ERR(pdev)); | |
158 | else { | |
159 | set_dev_node(&pdev->dev, acpi_get_node(adev->handle)); | |
160 | dev_dbg(&adev->dev, "created platform device %s\n", | |
161 | dev_name(&pdev->dev)); | |
162 | } | |
163 | ||
164 | kfree(resources); | |
165 | ||
166 | return pdev; | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(acpi_create_platform_device); | |
169 | ||
170 | void __init acpi_platform_init(void) | |
171 | { | |
172 | acpi_reconfig_notifier_register(&acpi_platform_notifier); | |
173 | } |