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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
91e56878 MW |
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> | |
91e56878 MW |
9 | */ |
10 | ||
11 | #include <linux/acpi.h> | |
12 | #include <linux/device.h> | |
e375325c | 13 | #include <linux/err.h> |
91e56878 MW |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
8a2f38dd | 16 | #include <linux/dma-mapping.h> |
a252d881 | 17 | #include <linux/pci.h> |
91e56878 MW |
18 | #include <linux/platform_device.h> |
19 | ||
5923f986 AS |
20 | #include "internal.h" |
21 | ||
48459340 | 22 | static const struct acpi_device_id forbidden_id_list[] = { |
08f63d97 JR |
23 | {"PNP0000", 0}, /* PIC */ |
24 | {"PNP0100", 0}, /* Timer */ | |
25 | {"PNP0200", 0}, /* AT DMA Controller */ | |
26 | {"ACPI0009", 0}, /* IOxAPIC */ | |
27 | {"ACPI000A", 0}, /* IOAPIC */ | |
2bbb5fa3 | 28 | {"SMB0001", 0}, /* ACPI SMBUS virtual device */ |
48459340 | 29 | {"", 0}, |
141a297b RW |
30 | }; |
31 | ||
cb0701ac AS |
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 | ||
a252d881 MW |
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 | ||
91e56878 MW |
86 | /** |
87 | * acpi_create_platform_device - Create platform device for ACPI device node | |
88 | * @adev: ACPI device node to create a platform device for. | |
1571875b | 89 | * @properties: Optional collection of build-in properties. |
91e56878 MW |
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 | * | |
7eaa2800 | 95 | * Name of the platform device will be the same as @adev's. |
91e56878 | 96 | */ |
1571875b HK |
97 | struct platform_device *acpi_create_platform_device(struct acpi_device *adev, |
98 | struct property_entry *properties) | |
91e56878 MW |
99 | { |
100 | struct platform_device *pdev = NULL; | |
863f9f30 | 101 | struct platform_device_info pdevinfo; |
90e97820 | 102 | struct resource_entry *rentry; |
8e345c99 | 103 | struct list_head resource_list; |
62eb4b07 | 104 | struct resource *resources = NULL; |
8e345c99 | 105 | int count; |
91e56878 MW |
106 | |
107 | /* If the ACPI node already has a physical device attached, skip it. */ | |
108 | if (adev->physical_node_count) | |
8ce62f85 | 109 | return NULL; |
91e56878 | 110 | |
48459340 ZR |
111 | if (!acpi_match_device_ids(adev, forbidden_id_list)) |
112 | return ERR_PTR(-EINVAL); | |
113 | ||
8e345c99 RW |
114 | INIT_LIST_HEAD(&resource_list); |
115 | count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
d2fe7251 | 116 | if (count < 0) { |
8ce62f85 | 117 | return NULL; |
d2fe7251 | 118 | } else if (count > 0) { |
6396bb22 | 119 | resources = kcalloc(count, sizeof(struct resource), |
d2fe7251 RW |
120 | GFP_KERNEL); |
121 | if (!resources) { | |
122 | dev_err(&adev->dev, "No memory for resources\n"); | |
123 | acpi_dev_free_resource_list(&resource_list); | |
8ce62f85 | 124 | return ERR_PTR(-ENOMEM); |
d2fe7251 RW |
125 | } |
126 | count = 0; | |
127 | list_for_each_entry(rentry, &resource_list, node) | |
a252d881 MW |
128 | acpi_platform_fill_resource(adev, rentry->res, |
129 | &resources[count++]); | |
91e56878 | 130 | |
8e345c99 | 131 | acpi_dev_free_resource_list(&resource_list); |
91e56878 | 132 | } |
91e56878 | 133 | |
863f9f30 | 134 | memset(&pdevinfo, 0, sizeof(pdevinfo)); |
91e56878 MW |
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 | */ | |
3b95bd16 AM |
140 | pdevinfo.parent = adev->parent ? |
141 | acpi_get_first_physical_node(adev->parent) : NULL; | |
863f9f30 RW |
142 | pdevinfo.name = dev_name(&adev->dev); |
143 | pdevinfo.id = -1; | |
144 | pdevinfo.res = resources; | |
145 | pdevinfo.num_res = count; | |
ce793486 | 146 | pdevinfo.fwnode = acpi_fwnode_handle(adev); |
1571875b | 147 | pdevinfo.properties = properties; |
1831eff8 SS |
148 | |
149 | if (acpi_dma_supported(adev)) | |
150 | pdevinfo.dma_mask = DMA_BIT_MASK(32); | |
151 | else | |
152 | pdevinfo.dma_mask = 0; | |
153 | ||
863f9f30 | 154 | pdev = platform_device_register_full(&pdevinfo); |
8ce62f85 | 155 | if (IS_ERR(pdev)) |
91e56878 MW |
156 | dev_err(&adev->dev, "platform device creation failed: %ld\n", |
157 | PTR_ERR(pdev)); | |
79f97c30 SD |
158 | else { |
159 | set_dev_node(&pdev->dev, acpi_get_node(adev->handle)); | |
91e56878 MW |
160 | dev_dbg(&adev->dev, "created platform device %s\n", |
161 | dev_name(&pdev->dev)); | |
79f97c30 | 162 | } |
91e56878 | 163 | |
8e345c99 | 164 | kfree(resources); |
79f97c30 | 165 | |
8ce62f85 RW |
166 | return pdev; |
167 | } | |
083bf668 | 168 | EXPORT_SYMBOL_GPL(acpi_create_platform_device); |
cb0701ac AS |
169 | |
170 | void __init acpi_platform_init(void) | |
171 | { | |
172 | acpi_reconfig_notifier_register(&acpi_platform_notifier); | |
173 | } |