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Mika Westerberg91e56872012-10-31 22:45:02 +01001/*
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>
Mika Westerberge3753252013-01-18 13:46:01 +000016#include <linux/err.h>
Mika Westerberg91e56872012-10-31 22:45:02 +010017#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20
Andy Shevchenko5923f982012-11-26 10:35:07 +010021#include "internal.h"
22
Mika Westerberg91e56872012-10-31 22:45:02 +010023ACPI_MODULE_NAME("platform");
24
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010025/*
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
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010033 { }
34};
35
Mika Westerberg91e56872012-10-31 22:45:02 +010036/**
37 * acpi_create_platform_device - Create platform device for ACPI device node
38 * @adev: ACPI device node to create a platform device for.
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010039 * @id: ACPI device ID used to match @adev.
Mika Westerberg91e56872012-10-31 22:45:02 +010040 *
41 * Check if the given @adev can be represented as a platform device and, if
42 * that's the case, create and register a platform device, populate its common
43 * resources and returns a pointer to it. Otherwise, return %NULL.
44 *
Mika Westerberg7eaa2802013-01-18 14:09:35 +000045 * Name of the platform device will be the same as @adev's.
Mika Westerberg91e56872012-10-31 22:45:02 +010046 */
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010047int acpi_create_platform_device(struct acpi_device *adev,
48 const struct acpi_device_id *id)
Mika Westerberg91e56872012-10-31 22:45:02 +010049{
50 struct platform_device *pdev = NULL;
51 struct acpi_device *acpi_parent;
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +010052 struct platform_device_info pdevinfo;
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010053 struct resource_list_entry *rentry;
54 struct list_head resource_list;
55 struct resource *resources;
56 int count;
Mika Westerberg91e56872012-10-31 22:45:02 +010057
58 /* If the ACPI node already has a physical device attached, skip it. */
59 if (adev->physical_node_count)
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010060 return 0;
Mika Westerberg91e56872012-10-31 22:45:02 +010061
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010062 INIT_LIST_HEAD(&resource_list);
63 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
64 if (count <= 0)
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010065 return 0;
Mika Westerberg91e56872012-10-31 22:45:02 +010066
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010067 resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
68 if (!resources) {
69 dev_err(&adev->dev, "No memory for resources\n");
70 acpi_dev_free_resource_list(&resource_list);
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010071 return -ENOMEM;
Mika Westerberg91e56872012-10-31 22:45:02 +010072 }
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010073 count = 0;
74 list_for_each_entry(rentry, &resource_list, node)
75 resources[count++] = rentry->res;
Mika Westerberg91e56872012-10-31 22:45:02 +010076
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010077 acpi_dev_free_resource_list(&resource_list);
Mika Westerberg91e56872012-10-31 22:45:02 +010078
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +010079 memset(&pdevinfo, 0, sizeof(pdevinfo));
Mika Westerberg91e56872012-10-31 22:45:02 +010080 /*
81 * If the ACPI node has a parent and that parent has a physical device
82 * attached to it, that physical device should be the parent of the
83 * platform device we are about to create.
84 */
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +010085 pdevinfo.parent = NULL;
Mika Westerberg91e56872012-10-31 22:45:02 +010086 acpi_parent = adev->parent;
87 if (acpi_parent) {
88 struct acpi_device_physical_node *entry;
89 struct list_head *list;
90
91 mutex_lock(&acpi_parent->physical_node_lock);
92 list = &acpi_parent->physical_node_list;
93 if (!list_empty(list)) {
94 entry = list_first_entry(list,
95 struct acpi_device_physical_node,
96 node);
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +010097 pdevinfo.parent = entry->dev;
Mika Westerberg91e56872012-10-31 22:45:02 +010098 }
99 mutex_unlock(&acpi_parent->physical_node_lock);
100 }
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +0100101 pdevinfo.name = dev_name(&adev->dev);
102 pdevinfo.id = -1;
103 pdevinfo.res = resources;
104 pdevinfo.num_res = count;
105 pdevinfo.acpi_node.handle = adev->handle;
106 pdev = platform_device_register_full(&pdevinfo);
Mika Westerberg91e56872012-10-31 22:45:02 +0100107 if (IS_ERR(pdev)) {
108 dev_err(&adev->dev, "platform device creation failed: %ld\n",
109 PTR_ERR(pdev));
110 pdev = NULL;
111 } else {
112 dev_dbg(&adev->dev, "created platform device %s\n",
113 dev_name(&pdev->dev));
114 }
115
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +0100116 kfree(resources);
Rafael J. Wysocki141a2972013-01-30 14:27:40 +0100117 return 1;
118}
119
120static struct acpi_scan_handler platform_handler = {
121 .ids = acpi_platform_device_ids,
122 .attach = acpi_create_platform_device,
123};
124
125void __init acpi_platform_init(void)
126{
127 acpi_scan_add_handler(&platform_handler);
Mika Westerberg91e56872012-10-31 22:45:02 +0100128}