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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>
Heikki Krogerus8a2f38d2014-09-24 11:00:37 +030019#include <linux/dma-mapping.h>
Mika Westerberg91e56872012-10-31 22:45:02 +010020#include <linux/platform_device.h>
21
Andy Shevchenko5923f982012-11-26 10:35:07 +010022#include "internal.h"
23
Mika Westerberg91e56872012-10-31 22:45:02 +010024ACPI_MODULE_NAME("platform");
25
Zhang Rui48459342014-05-30 14:35:34 +020026static const struct acpi_device_id forbidden_id_list[] = {
27 {"PNP0000", 0}, /* PIC */
28 {"PNP0100", 0}, /* Timer */
29 {"PNP0200", 0}, /* AT DMA Controller */
30 {"", 0},
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010031};
32
Mika Westerberg91e56872012-10-31 22:45:02 +010033/**
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 *
Mika Westerberg7eaa2802013-01-18 14:09:35 +000041 * Name of the platform device will be the same as @adev's.
Mika Westerberg91e56872012-10-31 22:45:02 +010042 */
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +020043struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
Mika Westerberg91e56872012-10-31 22:45:02 +010044{
45 struct platform_device *pdev = NULL;
46 struct acpi_device *acpi_parent;
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +010047 struct platform_device_info pdevinfo;
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010048 struct resource_list_entry *rentry;
49 struct list_head resource_list;
Kuppuswamy Sathyanarayanan62eb4b02013-07-22 16:51:20 -070050 struct resource *resources = NULL;
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010051 int count;
Mika Westerberg91e56872012-10-31 22:45:02 +010052
53 /* If the ACPI node already has a physical device attached, skip it. */
54 if (adev->physical_node_count)
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +020055 return NULL;
Mika Westerberg91e56872012-10-31 22:45:02 +010056
Zhang Rui48459342014-05-30 14:35:34 +020057 if (!acpi_match_device_ids(adev, forbidden_id_list))
58 return ERR_PTR(-EINVAL);
59
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010060 INIT_LIST_HEAD(&resource_list);
61 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
Rafael J. Wysockid2fe7252013-08-07 01:11:33 +020062 if (count < 0) {
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +020063 return NULL;
Rafael J. Wysockid2fe7252013-08-07 01:11:33 +020064 } else if (count > 0) {
65 resources = kmalloc(count * sizeof(struct resource),
66 GFP_KERNEL);
67 if (!resources) {
68 dev_err(&adev->dev, "No memory for resources\n");
69 acpi_dev_free_resource_list(&resource_list);
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +020070 return ERR_PTR(-ENOMEM);
Rafael J. Wysockid2fe7252013-08-07 01:11:33 +020071 }
72 count = 0;
73 list_for_each_entry(rentry, &resource_list, node)
74 resources[count++] = rentry->res;
Mika Westerberg91e56872012-10-31 22:45:02 +010075
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010076 acpi_dev_free_resource_list(&resource_list);
Mika Westerberg91e56872012-10-31 22:45:02 +010077 }
78
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;
Rafael J. Wysocki7b199812013-11-11 22:41:56 +0100105 pdevinfo.acpi_node.companion = adev;
Heikki Krogerus8a2f38d2014-09-24 11:00:37 +0300106 pdevinfo.dma_mask = DMA_BIT_MASK(32);
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +0100107 pdev = platform_device_register_full(&pdevinfo);
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200108 if (IS_ERR(pdev))
Mika Westerberg91e56872012-10-31 22:45:02 +0100109 dev_err(&adev->dev, "platform device creation failed: %ld\n",
110 PTR_ERR(pdev));
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200111 else
Mika Westerberg91e56872012-10-31 22:45:02 +0100112 dev_dbg(&adev->dev, "created platform device %s\n",
113 dev_name(&pdev->dev));
Mika Westerberg91e56872012-10-31 22:45:02 +0100114
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +0100115 kfree(resources);
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200116 return pdev;
117}
Zhang Rui083bf662014-03-14 14:06:25 +0800118EXPORT_SYMBOL_GPL(acpi_create_platform_device);