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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
22ACPI_MODULE_NAME("platform");
23
24static const struct acpi_device_id forbidden_id_list[] = {
25 {"PNP0000", 0}, /* PIC */
26 {"PNP0100", 0}, /* Timer */
27 {"PNP0200", 0}, /* AT DMA Controller */
28 {"ACPI0009", 0}, /* IOxAPIC */
29 {"ACPI000A", 0}, /* IOAPIC */
30 {"SMB0001", 0}, /* ACPI SMBUS virtual device */
31 {"", 0},
32};
33
34static void acpi_platform_fill_resource(struct acpi_device *adev,
35 const struct resource *src, struct resource *dest)
36{
37 struct device *parent;
38
39 *dest = *src;
40
41 /*
42 * If the device has parent we need to take its resources into
43 * account as well because this device might consume part of those.
44 */
45 parent = acpi_get_first_physical_node(adev->parent);
46 if (parent && dev_is_pci(parent))
47 dest->parent = pci_find_resource(to_pci_dev(parent), dest);
48}
49
50/**
51 * acpi_create_platform_device - Create platform device for ACPI device node
52 * @adev: ACPI device node to create a platform device for.
53 * @properties: Optional collection of build-in properties.
54 *
55 * Check if the given @adev can be represented as a platform device and, if
56 * that's the case, create and register a platform device, populate its common
57 * resources and returns a pointer to it. Otherwise, return %NULL.
58 *
59 * Name of the platform device will be the same as @adev's.
60 */
61struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
62 struct property_entry *properties)
63{
64 struct platform_device *pdev = NULL;
65 struct platform_device_info pdevinfo;
66 struct resource_entry *rentry;
67 struct list_head resource_list;
68 struct resource *resources = NULL;
69 int count;
70
71 /* If the ACPI node already has a physical device attached, skip it. */
72 if (adev->physical_node_count)
73 return NULL;
74
75 if (!acpi_match_device_ids(adev, forbidden_id_list))
76 return ERR_PTR(-EINVAL);
77
78 INIT_LIST_HEAD(&resource_list);
79 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
80 if (count < 0) {
81 return NULL;
82 } else if (count > 0) {
83 resources = kcalloc(count, sizeof(struct resource),
84 GFP_KERNEL);
85 if (!resources) {
86 dev_err(&adev->dev, "No memory for resources\n");
87 acpi_dev_free_resource_list(&resource_list);
88 return ERR_PTR(-ENOMEM);
89 }
90 count = 0;
91 list_for_each_entry(rentry, &resource_list, node)
92 acpi_platform_fill_resource(adev, rentry->res,
93 &resources[count++]);
94
95 acpi_dev_free_resource_list(&resource_list);
96 }
97
98 memset(&pdevinfo, 0, sizeof(pdevinfo));
99 /*
100 * If the ACPI node has a parent and that parent has a physical device
101 * attached to it, that physical device should be the parent of the
102 * platform device we are about to create.
103 */
104 pdevinfo.parent = adev->parent ?
105 acpi_get_first_physical_node(adev->parent) : NULL;
106 pdevinfo.name = dev_name(&adev->dev);
107 pdevinfo.id = -1;
108 pdevinfo.res = resources;
109 pdevinfo.num_res = count;
110 pdevinfo.fwnode = acpi_fwnode_handle(adev);
111 pdevinfo.properties = properties;
112
113 if (acpi_dma_supported(adev))
114 pdevinfo.dma_mask = DMA_BIT_MASK(32);
115 else
116 pdevinfo.dma_mask = 0;
117
118 pdev = platform_device_register_full(&pdevinfo);
119 if (IS_ERR(pdev))
120 dev_err(&adev->dev, "platform device creation failed: %ld\n",
121 PTR_ERR(pdev));
122 else {
123 set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
124 dev_dbg(&adev->dev, "created platform device %s\n",
125 dev_name(&pdev->dev));
126 }
127
128 kfree(resources);
129
130 return pdev;
131}
132EXPORT_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}