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Linux/drivers/acpi/acpi_platform.c

  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 
 23 ACPI_MODULE_NAME("platform");
 24 
 25 /*
 26  * The following ACPI IDs are known to be suitable for representing as
 27  * platform devices.
 28  */
 29 static 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  */
 53 int 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 
128 static struct acpi_scan_handler platform_handler = {
129         .ids = acpi_platform_device_ids,
130         .attach = acpi_create_platform_device,
131 };
132 
133 void __init acpi_platform_init(void)
134 {
135         acpi_scan_add_handler(&platform_handler);
136 }
137 

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