source: src/linux/universal/linux-3.18/drivers/acpi/acpi_platform.c @ 31885

Last change on this file since 31885 was 31885, checked in by brainslayer, 5 weeks ago

update

File size: 3.5 KB
Line 
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
24ACPI_MODULE_NAME("platform");
25
26static 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        {"", 0},
33};
34
35/**
36 * acpi_create_platform_device - Create platform device for ACPI device node
37 * @adev: ACPI device node to create a platform device for.
38 *
39 * Check if the given @adev can be represented as a platform device and, if
40 * that's the case, create and register a platform device, populate its common
41 * resources and returns a pointer to it.  Otherwise, return %NULL.
42 *
43 * Name of the platform device will be the same as @adev's.
44 */
45struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
46{
47        struct platform_device *pdev = NULL;
48        struct acpi_device *acpi_parent;
49        struct platform_device_info pdevinfo;
50        struct resource_list_entry *rentry;
51        struct list_head resource_list;
52        struct resource *resources = NULL;
53        int count;
54
55        /* If the ACPI node already has a physical device attached, skip it. */
56        if (adev->physical_node_count)
57                return NULL;
58
59        if (!acpi_match_device_ids(adev, forbidden_id_list))
60                return ERR_PTR(-EINVAL);
61
62        INIT_LIST_HEAD(&resource_list);
63        count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
64        if (count < 0) {
65                return NULL;
66        } else if (count > 0) {
67                resources = kmalloc(count * sizeof(struct resource),
68                                    GFP_KERNEL);
69                if (!resources) {
70                        dev_err(&adev->dev, "No memory for resources\n");
71                        acpi_dev_free_resource_list(&resource_list);
72                        return ERR_PTR(-ENOMEM);
73                }
74                count = 0;
75                list_for_each_entry(rentry, &resource_list, node)
76                        resources[count++] = rentry->res;
77
78                acpi_dev_free_resource_list(&resource_list);
79        }
80
81        memset(&pdevinfo, 0, sizeof(pdevinfo));
82        /*
83         * If the ACPI node has a parent and that parent has a physical device
84         * attached to it, that physical device should be the parent of the
85         * platform device we are about to create.
86         */
87        pdevinfo.parent = NULL;
88        acpi_parent = adev->parent;
89        if (acpi_parent) {
90                struct acpi_device_physical_node *entry;
91                struct list_head *list;
92
93                mutex_lock(&acpi_parent->physical_node_lock);
94                list = &acpi_parent->physical_node_list;
95                if (!list_empty(list)) {
96                        entry = list_first_entry(list,
97                                        struct acpi_device_physical_node,
98                                        node);
99                        pdevinfo.parent = entry->dev;
100                }
101                mutex_unlock(&acpi_parent->physical_node_lock);
102        }
103        pdevinfo.name = dev_name(&adev->dev);
104        pdevinfo.id = -1;
105        pdevinfo.res = resources;
106        pdevinfo.num_res = count;
107        pdevinfo.acpi_node.companion = adev;
108        pdevinfo.dma_mask = DMA_BIT_MASK(32);
109        pdev = platform_device_register_full(&pdevinfo);
110        if (IS_ERR(pdev))
111                dev_err(&adev->dev, "platform device creation failed: %ld\n",
112                        PTR_ERR(pdev));
113        else
114                dev_dbg(&adev->dev, "created platform device %s\n",
115                        dev_name(&pdev->dev));
116
117        kfree(resources);
118        return pdev;
119}
120EXPORT_SYMBOL_GPL(acpi_create_platform_device);
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