Merge tag 'arm-soc/for-4.16/drivers-fixes' of https://github.com/Broadcom/stblinux...
[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/pci.h>
21 #include <linux/platform_device.h>
22
23 #include "internal.h"
24
25 ACPI_MODULE_NAME("platform");
26
27 static 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         {"", 0},
34 };
35
36 static void acpi_platform_fill_resource(struct acpi_device *adev,
37         const struct resource *src, struct resource *dest)
38 {
39         struct device *parent;
40
41         *dest = *src;
42
43         /*
44          * If the device has parent we need to take its resources into
45          * account as well because this device might consume part of those.
46          */
47         parent = acpi_get_first_physical_node(adev->parent);
48         if (parent && dev_is_pci(parent))
49                 dest->parent = pci_find_resource(to_pci_dev(parent), dest);
50 }
51
52 /**
53  * acpi_create_platform_device - Create platform device for ACPI device node
54  * @adev: ACPI device node to create a platform device for.
55  * @properties: Optional collection of build-in properties.
56  *
57  * Check if the given @adev can be represented as a platform device and, if
58  * that's the case, create and register a platform device, populate its common
59  * resources and returns a pointer to it.  Otherwise, return %NULL.
60  *
61  * Name of the platform device will be the same as @adev's.
62  */
63 struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
64                                         struct property_entry *properties)
65 {
66         struct platform_device *pdev = NULL;
67         struct platform_device_info pdevinfo;
68         struct resource_entry *rentry;
69         struct list_head resource_list;
70         struct resource *resources = NULL;
71         int count;
72
73         /* If the ACPI node already has a physical device attached, skip it. */
74         if (adev->physical_node_count)
75                 return NULL;
76
77         if (!acpi_match_device_ids(adev, forbidden_id_list))
78                 return ERR_PTR(-EINVAL);
79
80         INIT_LIST_HEAD(&resource_list);
81         count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
82         if (count < 0) {
83                 return NULL;
84         } else if (count > 0) {
85                 resources = kzalloc(count * sizeof(struct resource),
86                                     GFP_KERNEL);
87                 if (!resources) {
88                         dev_err(&adev->dev, "No memory for resources\n");
89                         acpi_dev_free_resource_list(&resource_list);
90                         return ERR_PTR(-ENOMEM);
91                 }
92                 count = 0;
93                 list_for_each_entry(rentry, &resource_list, node)
94                         acpi_platform_fill_resource(adev, rentry->res,
95                                                     &resources[count++]);
96
97                 acpi_dev_free_resource_list(&resource_list);
98         }
99
100         memset(&pdevinfo, 0, sizeof(pdevinfo));
101         /*
102          * If the ACPI node has a parent and that parent has a physical device
103          * attached to it, that physical device should be the parent of the
104          * platform device we are about to create.
105          */
106         pdevinfo.parent = adev->parent ?
107                 acpi_get_first_physical_node(adev->parent) : NULL;
108         pdevinfo.name = dev_name(&adev->dev);
109         pdevinfo.id = -1;
110         pdevinfo.res = resources;
111         pdevinfo.num_res = count;
112         pdevinfo.fwnode = acpi_fwnode_handle(adev);
113         pdevinfo.properties = properties;
114
115         if (acpi_dma_supported(adev))
116                 pdevinfo.dma_mask = DMA_BIT_MASK(32);
117         else
118                 pdevinfo.dma_mask = 0;
119
120         pdev = platform_device_register_full(&pdevinfo);
121         if (IS_ERR(pdev))
122                 dev_err(&adev->dev, "platform device creation failed: %ld\n",
123                         PTR_ERR(pdev));
124         else {
125                 set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
126                 dev_dbg(&adev->dev, "created platform device %s\n",
127                         dev_name(&pdev->dev));
128         }
129
130         kfree(resources);
131
132         return pdev;
133 }
134 EXPORT_SYMBOL_GPL(acpi_create_platform_device);