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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 {"", 0},
31};
32
33/**
34 * acpi_create_platform_device - Create platform device for ACPI device node
35 * @adev: ACPI device node to create a platform device for.
36 *
37 * Check if the given @adev can be represented as a platform device and, if
38 * that's the case, create and register a platform device, populate its common
39 * resources and returns a pointer to it. Otherwise, return %NULL.
40 *
41 * Name of the platform device will be the same as @adev's.
42 */
43struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
44{
45 struct platform_device *pdev = NULL;
46 struct platform_device_info pdevinfo;
47 struct resource_entry *rentry;
48 struct list_head resource_list;
49 struct resource *resources = NULL;
50 int count;
51
52 /* If the ACPI node already has a physical device attached, skip it. */
53 if (adev->physical_node_count)
54 return NULL;
55
56 if (!acpi_match_device_ids(adev, forbidden_id_list))
57 return ERR_PTR(-EINVAL);
58
59 INIT_LIST_HEAD(&resource_list);
60 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
61 if (count < 0) {
62 return NULL;
63 } else if (count > 0) {
64 resources = kzalloc(count * sizeof(struct resource),
65 GFP_KERNEL);
66 if (!resources) {
67 dev_err(&adev->dev, "No memory for resources\n");
68 acpi_dev_free_resource_list(&resource_list);
69 return ERR_PTR(-ENOMEM);
70 }
71 count = 0;
72 list_for_each_entry(rentry, &resource_list, node)
73 resources[count++] = *rentry->res;
74
75 acpi_dev_free_resource_list(&resource_list);
76 }
77
78 memset(&pdevinfo, 0, sizeof(pdevinfo));
79 /*
80 * If the ACPI node has a parent and that parent has a physical device
81 * attached to it, that physical device should be the parent of the
82 * platform device we are about to create.
83 */
84 pdevinfo.parent = adev->parent ?
85 acpi_get_first_physical_node(adev->parent) : NULL;
86 pdevinfo.name = dev_name(&adev->dev);
87 pdevinfo.id = -1;
88 pdevinfo.res = resources;
89 pdevinfo.num_res = count;
90 pdevinfo.fwnode = acpi_fwnode_handle(adev);
91
92 if (acpi_dma_supported(adev))
93 pdevinfo.dma_mask = DMA_BIT_MASK(32);
94 else
95 pdevinfo.dma_mask = 0;
96
97 pdev = platform_device_register_full(&pdevinfo);
98 if (IS_ERR(pdev))
99 dev_err(&adev->dev, "platform device creation failed: %ld\n",
100 PTR_ERR(pdev));
101 else
102 dev_dbg(&adev->dev, "created platform device %s\n",
103 dev_name(&pdev->dev));
104
105 kfree(resources);
106 return pdev;
107}
108EXPORT_SYMBOL_GPL(acpi_create_platform_device);
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/platform_device.h>
20
21#include "internal.h"
22
23ACPI_MODULE_NAME("platform");
24
25/*
26 * The following ACPI IDs are known to be suitable for representing as
27 * platform devices.
28 */
29static const struct acpi_device_id acpi_platform_device_ids[] = {
30
31 { "PNP0D40" },
32 { "VPC2004" },
33 { "BCM4752" },
34
35 /* Intel Smart Sound Technology */
36 { "INT33C8" },
37 { "80860F28" },
38
39 { }
40};
41
42/**
43 * acpi_create_platform_device - Create platform device for ACPI device node
44 * @adev: ACPI device node to create a platform device for.
45 * @id: ACPI device ID used to match @adev.
46 *
47 * Check if the given @adev can be represented as a platform device and, if
48 * that's the case, create and register a platform device, populate its common
49 * resources and returns a pointer to it. Otherwise, return %NULL.
50 *
51 * Name of the platform device will be the same as @adev's.
52 */
53int acpi_create_platform_device(struct acpi_device *adev,
54 const struct acpi_device_id *id)
55{
56 struct platform_device *pdev = NULL;
57 struct acpi_device *acpi_parent;
58 struct platform_device_info pdevinfo;
59 struct resource_list_entry *rentry;
60 struct list_head resource_list;
61 struct resource *resources = NULL;
62 int count;
63
64 /* If the ACPI node already has a physical device attached, skip it. */
65 if (adev->physical_node_count)
66 return 0;
67
68 INIT_LIST_HEAD(&resource_list);
69 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
70 if (count < 0) {
71 return 0;
72 } else if (count > 0) {
73 resources = kmalloc(count * sizeof(struct resource),
74 GFP_KERNEL);
75 if (!resources) {
76 dev_err(&adev->dev, "No memory for resources\n");
77 acpi_dev_free_resource_list(&resource_list);
78 return -ENOMEM;
79 }
80 count = 0;
81 list_for_each_entry(rentry, &resource_list, node)
82 resources[count++] = rentry->res;
83
84 acpi_dev_free_resource_list(&resource_list);
85 }
86
87 memset(&pdevinfo, 0, sizeof(pdevinfo));
88 /*
89 * If the ACPI node has a parent and that parent has a physical device
90 * attached to it, that physical device should be the parent of the
91 * platform device we are about to create.
92 */
93 pdevinfo.parent = NULL;
94 acpi_parent = adev->parent;
95 if (acpi_parent) {
96 struct acpi_device_physical_node *entry;
97 struct list_head *list;
98
99 mutex_lock(&acpi_parent->physical_node_lock);
100 list = &acpi_parent->physical_node_list;
101 if (!list_empty(list)) {
102 entry = list_first_entry(list,
103 struct acpi_device_physical_node,
104 node);
105 pdevinfo.parent = entry->dev;
106 }
107 mutex_unlock(&acpi_parent->physical_node_lock);
108 }
109 pdevinfo.name = dev_name(&adev->dev);
110 pdevinfo.id = -1;
111 pdevinfo.res = resources;
112 pdevinfo.num_res = count;
113 pdevinfo.acpi_node.companion = adev;
114 pdev = platform_device_register_full(&pdevinfo);
115 if (IS_ERR(pdev)) {
116 dev_err(&adev->dev, "platform device creation failed: %ld\n",
117 PTR_ERR(pdev));
118 pdev = NULL;
119 } else {
120 dev_dbg(&adev->dev, "created platform device %s\n",
121 dev_name(&pdev->dev));
122 }
123
124 kfree(resources);
125 return 1;
126}
127
128static struct acpi_scan_handler platform_handler = {
129 .ids = acpi_platform_device_ids,
130 .attach = acpi_create_platform_device,
131};
132
133void __init acpi_platform_init(void)
134{
135 acpi_scan_add_handler(&platform_handler);
136}